VoLVA. MOLLUSCA. SOLENOSTOMATA. 331 



Length about |ths of an inch ; breadth |ths ; of a pink colour with or 

 mthout (C. arctica) dark dorsal spots ; strise distinct, bifurcated at the sides. 

 In the young state, the shell is smooth, except some appearances of striae on 

 the inner-lip, and the apex exhibits two or three whorls, — in which state it 

 is the C. bullata of Mont. Test. Brit. 202. t. vi. f. 1. The C. pediculus dif- 

 fers from the present species, with which it has been frequently confounded, 

 by the roughness of the striae, and the presence of a longitudmal dorsal 

 groove. 



EXTINCT SPECIES. 



1. C. ovifm-mis. — Egg-shapped, tumid, smooth, slightly marginate ; aperture 

 widest at the lowest end, left side of the aperture obscurely toothed ; right 

 lip involute, tumid — Sower. Min. Conch, t. iv. — London Clay, 



2. C. coccinelloides Ovate ^sphaeroidal, transversely striated ; striae nu- 

 merous, acute, not mterrupted ; aperture slightly arched, not contracted in 

 the middle Sotver. Min. Conch, t. ccclxxviii. f. 1. — Suffolk Cnag. 



3. C. retusa Obovate, sphaeroidal, transversely striated ; strise elevated, 



uninterrupted, few, remote ; aperture a little curved at the naiTowest end. 

 ^Sower. Min. Conch, t. ccclxxviii. f. 2. 



4. C. avellana. — Obovate, sphaeroidal, transversely striated ; striae nume- 

 rous, remote, elevated, interrupted by a longitudinal sulcus ; aperture a little 

 curved at the narrowest end. — Sovier. Min. Conch, t. ccclxxviii. f. 3. 



OVULADiE. 



Gen. LXIV. VOLVA. — Canal at each extremity, produced ; 

 external lip simple. 



295. V. patula. — Oblong, white, spirally striated ; pillai 

 with a shallow furrow. 



Bulla patula, Penn. Brit. Zool. iv. 117- 1. 70. f. 85, A. Don. Brit. Shells, 



t. cxliii. Mont. Test. Brit. 207 North and South Britain, rare. 



Length about an inch, breadth half an inch ; outer-lip regularlj' rounded ; 

 inner-lip protuberant in the middle, twisted and subreflected retrally ; back, 

 rounded. 



GEN. CALPURNA. — Canals abbreviated ; external lip 



simple. 



1. L. Leathesi Elliptical, elongated, rather ventricose in the middle ; 



smooth ; a large plait on the pillar ; outer-lip smooth, very thick, and rather 

 flattened — Ovula Leath. Sower. ]\Im. Conch, t. cccclxxviii.— In the Crag at 

 Walton. 



