HRACniOI'ODA. J)l 



13. TEREnRATELLA LaBRADOHENSIH. B.M. 



Sficll oviito, prodiionl at the hciik, whitish, witli ohsnirc raiha- 

 tiu<; ril)s ; dorsal valvi- nearly orbieiilar, tlattish ; ventral valve 

 with a jirouiiiu-nt beak, perforated by a large, entire foramen ; 

 dcltidinra rather larfre ; loop elongated, doiil)ly attaehed. Lon. 7, 

 hit. (i, alt. lines. 



Terel)ratnla Laljradorcnsis, G. Sowerby, Thes. Conch, vii. p. 362. 



t. 71. f. S!', !'(). 

 Terebratilla Labradorensis, Dav. Ann. Nat. Hist. 1852, p. 368. 

 Hab. Labrador (Goodsir). 



14. Teredratella Spitzbergensis. 



Sfic/I small, oval, elongated, .smooth, pale horn-colonr ; valves 

 almost eqnally convex, margins even ; dorsal valve slightly de- 

 pressed in front ; beak produced, recurved, obscurely keeled ; 

 foramen moderate, incom])lete ; (leltidium of two distinct elon- 

 gated plates ; loop elongated, reflected, attaehed near the extre- 

 mity of the prominent central septum. Lon. 4, lat. 3, alt. 2 

 lines. 



Terebratella Spitzbergensis, Davidson, 1852, Proc. Zool. Soc. 

 Hab. ISpitzbergen. (Mus. Cmning.) 



15. Terebratella pusilla. 



Shell small, thin, nearly circular, depressed, smooth ; area 

 large ; foramen large, incomplete ; deltidia rudimentary. Lon, 

 and lat. 2\, alt. 1 line. 



Terebratula pusilla, Philippi, 1844, Foss. Tert. Allem. p. 17. pi. 2. 



f. 15. 

 Terebratella pusilla, D'Orb. Prod. iii. p. 134. 

 Fossil. Miocene. Cassel. 



16. Terebratella Sayi. B.M. 



Shell orbicular, depressed, ornamented with about eleven ra- 

 diating plaits, crossed by a few conspicuous lines of growth near 

 the margin ; plaits strong, sometimes jjlicated near the edge ; 

 dorsal valve rather flat ; ventral convex; beak scarcely prominent; 

 area small and flat ; foramen small, incomplete ; deltidium rudi- 

 mentary. Lon. y, lat. \), alt. 5 lines. 



Terebratula Savi, Morton, 1829, Journ. Philad. p. 76. pi. 3, f. 5, 6; 



18.34, Syn. Cret. Group, p. /I. pi. 3. f. 3, 4. 

 Terebratula plicata. Say, 1830, Amer. Journ. ii. p. 43. 

 Terebratella plicata, D'Orb. Prod. ii. p. 259. 

 Fossil. Chalk. New Jersey, U.S. 



