38 
CONVOLUTA 6 Genera. 
Shell without a canal, hut having the base of the aperture channelled or effuse; the whorls large, 
compressed, convolute, the last nearly covering the whole of the others. 
Ovula. — Shell turgid, attenuated at each end, the margins turned inwards: aperture lon- 
gitudinal, narrow, effuse at the extremities; without teeth on the left lip. 
(1) Right lip indented. 
Plate XIX. Fig - . 16. O. oviformis. (Bulla ovum. — Linn.) 
(2) Right lip smooth, not indented. 
Plate XIX. Fig. 17- 0. birostris. (Bulla birostris. — Linn.) 
Cypr^a. — Shell oval, or ovate oblong, convex; the lips curved inwards : aperture longi- 
tudinal, narrow, toothed on both sides, the extremities effuse. Spire very small, 
hardly perceptible. 
Plate XIX. Fig. 18, 18 (a) C. talpa. (Idem. — Linn.) 
Terebellum. — Shell convolute, sub-cylindrical, pointed at the summit: aperture longi- 
tudinal, narrow at the upper part, notched at the base. Columella smooth, the 
lower part truncated. 
Plate XX. Fig. 1. T. subulatum. (Bulla terebellum. — Linn.) 
Ancillaria. — Shell oblong, sub-cylindrical, spire short, not channelled at the sutures: 
aperture longitudinal, scarcely notched at the base, effuse. A callous and oblique 
varix at the base of the columella. 
Plate XX. Fig. 2. A. cinnamomea. 
Oliva. — Shell subcylindrical, convolute, smooth, spire short, sutures channelled: aper- 
ture longitudinal, notched at the base. Columella obliquely striated. 
Plate XX. Fig. 3. 0. maura. (Voluta oliva. Variety. — Linn.) 
Conus. — Shell turbinated, or inversely conical, convolute : apertui’e longitudinal, narrow, 
not toothed ; base effuse. 
(1) Shells coronated. 
Plate XX. Fig. 4. C. nocturnus. 
(2) Shells not coronated. 
Plate XX. Fig. 5. C. monile. (Idem. — Solander’s MSS.) 
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