Part 75

TRUMPET SHELL. A large species of Triton (variegatus), used by natives of South Sea Islands as a trumpet, to call warriors and herds of cattle together. It answers the purpose tolerably well, producing a very sonorous blast.

TRUNCATED. (truncus, cut short.) Terminating abruptly, as it were cut short. Ex. Solenensis, fig. 60.

TRUNCATULANA. D'Orb. A genus of microscopic Foraminifera.

TRUNCATELLA. Risso. A genus composed of several species of land shells which have been confounded by some authors with Cyclostoma. The genus is thus described: "Shell turriculated, cylindrical, decollated or truncated at the apex, no epidermis; aperture oval, short, with lips continuous, simple." Ex. Truncatella truncatulina, Lowe, Zool. Journ. t. 5. p. 80. Our plates, fig. 520, 521. It is found on the shores of Britain, the Mediterranean, and West Indies.

TUBA. Lea. A genus of small fossil shells, described as resembling Turbo, but with the aperture more like that of Melania. Lea. Contrib. Geol.

TUBERCLE. (tuberculus.) A small swelling excrescence, or knob.

TUBERCULATED. Having a number of small lumps or pimples, as Turrilites, fig. 483.

TUBICINELLA. Lam. (Tubicen, a trumpeter.) Order, Sessile Cirripedes, Lam.--Descr. A cylindrical tube, composed of six elongated valves jointed together side by side, striated longitudinally, surrounded by concentric rings; aperture circular, enclosed by an operculum of four valves, placed perpendicularly in an epiphragm.--Obs. The Tubicinellæ are found with nearly the whole shell buried in the thick skin of the whale. T. Balænarum.

TUBICOLARIA. Lam. (Tuba, a tube; cola, an inhabitant.) A family of the order Conchifera Dimyaria, Lam. consisting of bivalves soldered as it were within, or connected with, a testaceous tube. The genera contained in this family may be thus distinguished.

1. ASPERGILLUM. Valves fixed, tube perforated and fringed. Fig. 44.

2. TEREDINA. Valves fixed, prominent, tube closed at one end. Fossil. Fig. 46, 47.

3. CLAVAGELLA. One valve fixed, the other free. Fig. 45.

4. TEREDO. Both valves free, tube open at both ends. Fig. 48, 49.

5. FISTULANA. Valves free, tube closed at one end, straight, long. Fig. 53, 54.

6. GASTROCHÆNA. Valves free, tube closed at one end, short, bulbous. Fig. 52.

TUBIVALVES. Bl. Shells composed of two valves connected in a tube, corresponding with the family Tubicolæ of Lamarck.

TULIPARIA. Sw. A sub-genus of "Coronaxis," Sw. Lardn. Cyclop. Malac. p. 311.

TURBINACEA. Bl. The sixth family of Polythalamacea, Bl. containing the genera Cibicides and Rosallites, microscopic Foraminifera.

TURBINACEA. Lam. A family of the first section of the order Trachelipoda, Lam. containing the following genera.

1. SOLARIUM. With umbilicus reaching to the apex; including Bifrontia and Orbis. Fig. 353 to 356.

2. ROTELLA. A callosity on the under side. Fig. 357.

3. PHASIANELLA. Oval; operculum shelly. Fig. 367.

4. PLANAXIS. Columellar lip flat; aperture notched. Fig. 365.

5. TURBO. Top-shaped; mouth generally round; operculum shelly. Fig. 368.

6. TROCHUS. Top-shaped; mouth generally angulated; operculum horny, consisting of many whorls; including Elenchus. Fig. 358, 359, 361.

7. MARGARITA. Operculum horny, consisting of few whorls; pearly. Fig. 362.

8. LITTORINA. Similar, not pearly; including Assiminnea. Fig. 363, 363*.

9. PHORUS. Attaching dead shells, stones, &c. Fig. 360.