OP MOLLUSCA. Ill 



§§§ Mouth of shell ovate, with an indistinct canal in front. 



5. Mesalia. 



Shell turrited, spirally ribbed ; whorls convex ; mouth ovate, sub- 

 circular, with an indistinct canal in front ; outer lip simple. Oper- 

 culum circular ; whorls many. — Adams, Gen. Moll. t. 38. f. 4 a. 



1. M. brevialis, Adams, Gen. Moll. t. 38. f. 4 (shell only). 



** Operculum annular (p. 95). 



Fam. XVIII. BARLEEIADiE. 



Animal : Eyes exterior, basal. Tentacles short, broad, rounded at 

 the tip, not setaceous. Rostrum simple. Foot nicked behind ; 

 opercular lobe simple, like Rissoella. "Operculum testaceous, sub- 

 annular ; under surface with a raised rib and a long pointed testa- 

 ceous apophysis proceeding from the nucleus," nearer the base than 

 the centre. Shell conical, turbinate ; whorls tumid, smooth or 

 striated ; aperture oval, entire, contracted behind, rounded in front ; 

 outer lip acute, simple. Teeth ? 



1. Barleeia. 



Shell oval ; whorls tumid, rapidly increasing ; aperture oval, 

 entire ; outer margin sharp. Mantle enclosed, simple, without pos- 

 terior filament. Rostrum very short. Mouth vertical. Jaws horny. 

 Tongue spinose. Tentacles very short, broad, cylindrical ; eyes very 

 large, black, on the outer side of the base. Foot elongate, narrow, 

 oval, arched and double-tipped in front, rounded behind ; opercu- 

 ligerous lobe small, expanded below. Operculum testaceous, sub- 

 oval, subannular, with a central longitudinal furrow and a testaceous 

 central apophysis. 



1. B. rubra, Forbes fy Hanley, B. M. iii. t. 78. f. 4, 5, t. 80. f. 3. 



2. Hydroclena. 



Shell conical ; aperture roundish. Peristome simple, thin. Oper- 

 culum oblong, subspiral, of half a whorl. Nucleus subapical, with 

 a prominent process on the straight inner edge. Tentacles very 

 short, conic, broad, close together over the base of the subcylindrical 

 rostrum. Eyes on the middle of the upper part of the base of the 

 tentacles. 



1. H. Callaroensis, Pfeiffer, Kiister Conch, t. 13. f. 28, 35. On 

 stones in Dalmatia. 



Fam. XIX. VIVIPARIDjE. 

 Trunk annulated, contractile. Teeth few, unequal ; central 1, 



