Guppy Reprint 



Page 37 

 Corbula pisum ? Sow. 



* Gastrochaena ovata Sow. 



* Pholadidea calva Gray 



t Lunulites sp. . . . . . . . . VN 



Cellaria salicornia Pallas . . . . R 



f ? Discopora sp. . . 

 ? Eschara sp. 

 (VN. very numerous. N. numerous. R. Rare.) 



In addition the fossils enumerated in the foregoing 

 list there are a few small bones, probably of fishes, and 

 a single tooth has come to light. Crustacea are repre- 

 sented by Balani and by fragments of brachyurous 

 decapoda. There are also a few spines and fragments 

 of echinoderms. 



The shells marked * in the preceding list are known 

 to me by recent examples to be still existing in neigh- 

 boring seas. Those marked f are species unknown to 

 me either from published works or specimens. — Ostrea 

 cucnllala is, I believe, a shell of the eastern seas. — Car- 

 dium ( Papyridea) . This is not the recent C. (Papyridea) 

 ringiculum ; it is however allied to that species, but 

 much smaller and thicker. 



It will be observed that there are 27 species known 

 as existing in contiguous waters out of a total number 

 of 56 gasteropoda, including 2 freshwater shells and 2 

 opisto branchs. Then 16 of the remainder, if not 

 found in the surrounding seas, are probably existing 

 elsewhere. To two of these I have assigned the names 

 Nassa incrassata and TrocJms granulatus, on account of 

 their resemblance to the European species of those 

 names, but at the same time with much hesitation. 

 The proportion of recent species thus arrived at is 

 nearly 80 per cent. ; or 20 per cent, of unknown and 

 extinct species, but making due allowance for imperfect 

 knowledge, there would probably remain at least 10 per 

 cent, of extinct species of Gasteropoda. 



With regard to the Conchifera, the proportions are 

 nearly the same. There are 22 species out of the total 

 of 36 which are certainly known to me to exist in con- 



