240 



body equally on both sides and furnished with a small 

 perforation. Sandwich, fyc. minute. 



P. LOBVIGTULA. NAUTILUS L. Mont. p. 188. fy 

 Sup. p. \75.t. 18. /. 1,^Turt. D. p. 118 D. 

 p. 341. F. p. 228, Lin. T. 8. p. 115. (Walk. t. 3. 

 /. 67. Adams, t. 14. /. 32.J Glossy, smooth, the 

 partitions marked by subelevated flexuous rays, exte- 

 riorly subcarinated, sides convex ; mouth triangular 

 with a rim which does not clasp the body whorl ; aper- 

 ture near the discal edge : chambers about ten. 

 England and Scotland, minute. 



D. DEFRESSULA. Macg. Aberd. p. 318. NAU- 

 TILUS D. Mont. p. 190. Sup. p. 78. t. 18. f. 9. 

 Lin. T. 8. p. l\6.Turt. D. p. 118. Walk. t. 3. 

 /. 68. Adams. 1. 14. /, 63. D.p. 341. F. p. 228. 



Depressed, exteriorly rounded, the chambers and parti- 

 tions nearly even, about nine, the latter slightly curved 

 and ending at the centre in a pellucid spot. England 

 and Scotland, minute. 



P. UMBILICATULA. Macg. Aberd^p. 317. NAUTI- 

 LUS. U. Mont. p. 191. fy Sup. p. 78. t. 18. /. L 

 Turt. D.p. l\9. Walk. t. 3./. 69. F. p, 229. D. 

 p. 343. -Lin. t. 8. p. 115. Depressed, exteriorly 



