



K. IIMNCAU i.\ Bruguidre, PL 21,flgf, 11,12; pi. 'J- 



Slu-ll forming a conical cylinder, narrow on tin- upper half, more 

 or le-s deeply constricted in the middle, and expanding <>n the |D\\T 

 halt'; it is nearly opaque and glossy: snilptun nuineroiis longitu- 

 dinal striae or (luted ribs on the upper half; these are often sharp 

 at the apex, not so distinct in the middle of the shell, and usually 

 disappear towards the base, where they are replaced by lines of 

 growth; the spire is frequently striated across, like an Ammonite; 

 epidermis filmy; color white; spire involute, abruptly truncated, 

 and encircled by a narrow and solid rim or rounded keel ; whorls 3 

 4, gradually decreasing in size towards the center of the apex ; the 

 first or innermost whorl is globular ; suture deep ; mouth narrow for 

 more than half its length on the upper part, pear-shaped and very 

 wide at the base, which is rounded : outer lip gently curved and 

 folded inwards in the middle; the upper part projects (sometimes 

 considerably) beyond the apex; outer corner rounded ; inner corner 

 receding and obliquely incurved; inner lip slight, continuous with 

 the outer lip above, where it is folded a little over the apex, as well 

 as over the pillar, behind which it forms a small and narrow um- 

 bilical chink ; pillar short, thick, and flattened : fold tooth-like and 

 strong (Jeffr.). 

 Coatt of Norway to the Canaries; Mediterranean and Adriatic Seas. 



Bulla truncatula BRUG., Encycl. Meth., p. 377, 1792. Utriculus 

 truncatulus JEFFR., Brit. Conch., iv, p. 421, pi. 94, f. 2. SARS, 

 Moll. Reg. Arct. Norv., p. 285, pi. 26, f. 2 ; pi. 17, f. 18 (var. ;*>//,/- 

 cida). Retusa truncatula BUQ., DAUTZ. & DOLI.I ., Moll. Rouss., 

 i, p. 527, pi. 64, f. 12-14. Bulln trwicata AD. (not Gmelin), Tr 

 Linn. Soc., v, p. 1, pi. 1, f. 1, 2. Volvaria trunoitx BKOWX, 111. 

 Conch., G. B., Ed. 1, pi. 19, f. 17, 18. Cylichnn trtin<;,f,, LOVEN, 

 Ind. Moll. Skand., p. 42. FORBES & HANI, i:v, Hist. Brit. Moll., 

 iii, p. 510, pi. 114, f. 7, 8; pi. vv, f. 4 (animal). Mi YII: A 

 M<mrs, Fauna der Kieler Bucht, i, p. 87 (animal). Biilln rrfu.^i 

 MATON & RACK., Descr. Cat. in Trans. Linn. Soc., viii, p. 128, 1804. 

 Retuxa obtusa BROWN, Pop. Encycl., ii, p. 78, pi. 17, f. 110. 

 Volvnrin pcllucidn BROWN, 111. Conch. G. B. Edit. 1, p. 4, pi. 19, 

 f. 45, 46. Utriculus truncatulus var. />///-//o, ////.< MONTS., Norn. Gen. 

 * Spec., p. 50. 



