248 APPENDIX. 



been broken off. The pallets were very variable in shape, ranging 

 in form between that of a kite (with a slight retusion of the 

 broader end) and of the petal of a primrose : the angle of the 

 peaked extremity was remarkably acute. The short, thin, and 

 tapering stalk, though really straight, does not lie level, when 

 the pallet is attached to a card by the outer or convex side, 

 owing to the inward bend of its posterior extremity. In other 

 respects our previous description of a few individuals is not in- 

 applicable to the species. 



Vol. i. p. 127. Pholadidea papiracea. 



This interesting mollusk has been found abundantly by Dr. 

 Farran perforating the remains of a submarine forest at Clonea, 

 near Dungarvan, in the south of Ireland. 



Valuable notes on the animals of several of the Pholadidce 

 have been published by Mr. Clark, in the fifth and sixth volumes 

 of the '' Annals of Natural History " (second series), with many 

 considerations respecting the manner in which they bore. 



Vol. i. p. 149. Note to Saxicava. 



The manifestly immature state of the specimens here alluded 

 to, forbad any positive allocation of them. Mr. Jeffreys having 

 now forwarded us a larger example (a single right valve), re- 

 ceived from the late Professor ]\Iacgillivray, measuring nearly 

 half an inch in length, and fully a quarter of an inch in breadth, 

 has enabled us to positively declare that they are not Saxicavcv. 

 The hinge being developed exhibits a rather small and somewhat 

 triangularly spoon-shaped cartilage receptacle, jutting out below 

 the level of the cardinal edge, and running very obliquely from 

 the beak hindward : it rises somewhat towards its broader ex- 

 treroity, yet is not very much elevated above the level of the 

 anterior part of the hinge plate. Renewed examination of the 

 original tiny specimens elicits the fact, that there is present in 

 them also a most shallow similar pit that lies in the somewhat 

 thicker (in proportion) substance of the cardinal plate, and does 

 not project to any extent above or beneath it. The large valve, 

 which is somewhat tortuous, a little ventricose, and subplicated 



