10 CATALOGUE OF PTEROPODA. 



2. DIACRIA. 



Body short, sometimes with lateral appendages. — Shell globular ; 

 mouth narrower than the cavity, with a slit on each side, not in- 

 terrupted in front ; apex often truncated in the adult. 



Diacria (trispinosa), Gray, Syn. Brit. Mus. 1840, 1842; Proc. 



Zool. Soc. 1847, 203 ; Agass. Nom. ; Herrm. hid. Gen. Malac. 



i. 383. 

 Hyalea b. elongata. Rang. Man. 114, 1829. 

 Hyalffia **, DOrh. Voy. Amer. Merid. 77 ; Cuba, 80. 



1. Diacria trispinosa. 



Shell elongated, straight, dilated anteriorly, compressed on each 

 side, terminated posteriorly with a very long spine, armed late- 

 rally with two short spines. 



Hyalaea trispinosa, Lesueur, Blainv. Diet. Sci. Nat. xxii. 82 ; DOrb. 



Voy. Am. Mer. Moll. 106, t. 7, f. 1—5, and t. 20, f. 1, 2 ; Moll. 



des Canar. 29, No. 14 ; Ram. Sagra Hist. Cuba Moll. 80 ; 



Chemn. Conch, i. 65, vign. 13, f. a — d (1785) ; Rang, Monog. 



ined. t. 3 ; Guerin, Icon. Reg. Anim. Moll, t 4 ; Blainv. Diet. 



Sc. Nat. xxii. 82; Lamk. Hist. ed. 2, vii, 421, No. 15; Desk. E. 



M. iii. 310; Philippi, Sicil. ii. 71 ; Loven, K. Vet. Akad. 1847, t. 



3, f. 4 ; Forbes ^ Hanley, Brit. Moll. ii. 380, t. U, f. 3. 

 H. depressa, Bivon, Efem. Sicil. t. 1, f. 4, 5 ; Philippi, Sieil. i. 



101, t. 6, f. 19. 

 H. triacantha, Guidotti, Bronn, Ital. 85. 

 Hyale a trois pointes, Voy. Bonite Moll. t. 6, f. 1, 10. 



a — g. Shell. Coast of Brazil. Presented by Dr. Sinclair, R.N. 



2. Diacria Orbignii. 



Shell ovate, globular, smooth on the upper part and convexly gib- 

 bous, flattish inferiorly, radiately grooved, terminated anteriorly 

 by an inflexed semicircular lip ; deeply cleft at the sides ; poste- 

 rior extremity scarcely prominent. 



Hyalea Orbignii, Rang, Ann. Sci. Nat. xvi. 496, t. 19, f. 3 ; Desk, 

 in Lamk. Hist. ed. 2, vii. 417. 



Hab. Fossil, St. Paul, near Dax. 



