APPENDIX. 255 



Vol. ii. p. 102. Lepton convexum, 



Mr. Alder, with his usual candour, has forwarded us a suite of 

 specimens to prove that his L. convexum is the same species as 

 the nitidum of Turton (our KelUa nitida). The finding of 

 several additional specimens at CuUercoats, and the capture of no 

 less than eighty examples ! from the coralline region, at Ex- 

 mouth by Mr. Clark (who had arrived at the same conclusion as 

 to the identity of the shells) has demonstrated the remarkable 

 fact that the punctures which in certain individuals pervade the 

 entire surface, in others are only present on the umbones, and 

 are often so obscure, yet we believe never wholly absent, although 

 not perceptible with an ordinary glass, in worn examples, such as 

 the original types of nitidum were, as to be almost invisible. In 

 the smoother variety there are usually regular, though very fine 

 and rather distant concentric striae ; in the more ornate variety, 

 the crowded punctures are smaller and more circular upon the 

 umbones, increasing in size and irregularity of contour beneath 

 them, so as at times to assume the appearance of short rough 

 and slanting scratches. Our description of Kellia nitida applies 

 fairly enough to all the specimens, we should add, however, 

 that the outline is bluntly subquadrangular. As the animal 

 scarcely differs in the least (teste Clark) from that of sr/uamosum, 

 the species must be restored to its original allocation, as Lepton 

 nitidum. The observations of Mr. Clark upon the animal show 

 that the shorter and more obtuse extremity of the shell is the 

 posterior (not, as in text, anterior) end. 



Mr. Hanley has dredged the more characteristic convexum from 

 a coralline bottom near St. Peter's Port, Guernsey. 



Vol. ii. p. 103. Lepton Clarki^, Clark. 



Very inequilateral, obliquely oboval, not shagrecned. 



Plate CXXXII., f. 7. 



Lepton ClarUce, Clark, Annals Nat. Hist. 2nd ser. 1852, March and April. 



Shell minute, obliquely oboval, snow-white, very thin, com- 

 pressed, somewhat shining, not shagreened, but most closely set 



