294 A. J. JUKES-BROWNE ON THE RELATIONS OE 



Pleurotomaria Eouxi, D'Orb. 



Pleurotomaria Rouxi, Pict. & Camp. Ste. - Croix, ii. p. 453, pi. 81. 

 f. 3 ; Eenevier, Eaune de Chev. p. 140, pi. 6. f. 10, 11. 



Pleurotomaria Fittoni, Pict. & Roux. (non Rom.) Gr. Yerts, p. 244. 



M. Eenevier possesses a specimen from Cambridge which still 

 retains a portion of the smooth shell which characterizes this species ; 

 casts closely agreeing with his description and figures are very 

 common, those now before me being very depressed, especially in 

 the earlier whorls, which are flattened above, slightly keeled, and 

 rounded below ; four or five whorls are usually visible. 



Pleurotomaria Ehodani, Brong. 



Pleurotomaria Ehodani, Brong.^Pict. & Eoux, Gres Yerts, p. 242, 

 pi. 24. f. 1. 



This species has three or four rounded whorls, with a rather more 

 elevated spire than P. Rouxi, the angle varying from 105° to 125°, 

 while the latter forms a convex angle of 140° to 160°. It is very 

 common at Cambridge, and has also been recorded from the Upper 

 Greensand of Hants. 



Crepidula ? Cooksonijs, Seeley. 



Crepidula CooJcsonice, Seeley, Ann. Mag. Nat. Hist. 1861, vol. vii. 

 pi. xi.f. 18. 



Galyptrcea 8anctce-C?-ucis, Pict. & Camp. 1864, Ste.-Croix, pi. 97. 

 f. 5-8. 



Any one who compares the specimens of the above shell in the 

 "Woodwardian Museum with the figures in Pictet and Campiche, can 

 hardly fail to recognize them as belonging to the same species, not- 

 withstanding the difference of generic name. The cast is easily 

 recognized by the mark of the shelly partition, which has the shape 

 of two S-curves meeting to form a pinched-up bracket; this appears 

 to indicate closer relations with Calypircza than with Crepidula. It 

 is a rare fossil, but is sometimes found inside the last chamber of 

 large Ammonites and Hamites. 



Crepidula gaultina, Buv. PI. XIY. figs. 12, 13. 



Crepidula gaultina, 1852, Pict. & Camp. Ste.-Croix, pi. 97. f. 3, 4. 



Crepidula conica, Seeley, MS. ? 



? Galericulus alius, Seeley, Ann. & Mag. Nat. Hist. 1861, vol. vii. 

 pi. xi. f. 19. 



The specimen named C. conica in the Woodwardian Museum 

 appears to me identical with the C. gaultina of Buvignier, which is 

 found, though rarely, in the " Gault superieur " of St. Croix. The 

 mark of the shelly partition takes the form of two straight furrows 

 diverging from a point just below the apex. 



The small shell, named Galericidus alius by Mr. Seeley, in Ann. & 

 Mag. Nat. Hist. vol. vii. 1861, p. 12, and of which only one specimen 

 exists, may not improbably turn out to be an elevated form of 

 Crepidula gaultina ; the generic name is founded on the supposed 



