Oethoceba. MOLLUSCA. CEPHALOPODA. m 
22. \j. perluclda . — Shell with six equidistant, longitudinal 
ribs. 
Ver. per. Mont. Test. Brit. 525, t. xiv. f. 3. — At SeaSalter, Mr Boys. 
Length about j^^th of an inch ; smooth ; rounded retrally with a small 
knob ; aperture very small. 
With decussating striae. 
2S. L. squamosa . — Strije undulated, giving the shell an im- 
bricated appearance. 
Verm, squam. Mont. Test. Brit. 526, t. xiv. f. 4 — At Seasalter, Mr 
Boys. 
Shell minute, suhglobose, the aperture a little produced. 
Surface smooth. 
24. L. glohosa. — Nearly ovate, the mouth not produced. 
Serp. Lag. Isevis globr)sa, Walk. Test. Min. 1. 1. f. 8 — Sandwich, rare. 
Shell white, transparent ; the aperture round. 
25. L. laevis. — Ovate, with a produced cylindrical neck. 
Serp. Ijag. Isevis ovalis. Walk. Test. t. 1. f. 9. — At Sandwich, rare. 
Bluish-white, transparent ; it differs from the last in its more oblong shape 
and produced mouth. 
26. L. marginata. — Compressed, marginated. 
Serp. Lag. marginata, Walk. Test. Min. t. 1. f. 7 — ^Verm. marg. Mont. 
Test. Brit. 524. — On the English coasts, rare. 
Shell nearly ovate ; the mouth but little produced. In a single speci- 
men, which I found in sand, from JZetland, and which, by accident, was 
broken on the stage of the microscope, appearances of internal plates, the 
partitions of chambers, were indistinctly observed. 
27. L. urna. Globular, with a produced knob retrally. 
Verm, urnse, Mont. Test. Brit. 525, t. xiv. f. 1 — In sand from Shepey 
Island. 
Length about a line ; slopes suddenly into a short conic neck. 
The place of this genus is far from being satisfactorily determined, and the 
minuteness of the species composing it present great obstacles to an accurate 
examination. 
Gen. IX. ORTHOCERA. — Shell (naked ?) nearly straight, 
the chambers separated by transverse perforated septa, 
a. Jlecent species. 
^ With longitudinal ribs. 
28. O. Jugosa. — Subcylindrical, slightly curved, with nume- 
rous longitudinal ribs. 
Nautilus jug. Mont. Test. Brit. 198, t. xiv. f. 4. — On the Kentish coast, 
Mr Boys. 
Length about |th of an inch ; tapering little, chambers globose, nine in 
