139 
young or greatly worn shells to deal with. Several species 
have been added to the list of this collection. It is 
therefore necessary to print a few corrigenda and addenda. 
25. Lucina leucoma, was so named from a few worn and 
small valves, since which living shells have been 
taken and it proves to be L. borealis, smaller 
than normal specimens. 
31. Cardium rusticum; this must be given up as belong- 
ing to this locality. All my specimens belong 
to C. echinatum. 
96. Venus casina, are shells much worn of V. verrucosa. 
97. Circe minima ; the one small valve so named proves 
to be a very young Cyprina Islandica. 
99. Cardium fasciatum; the two small specimens so 
named are young of C. echinatum. 
109. Pecten niveus ; the valve so named is a white 
variety of P. pusio, a common shell in the bay. 
White varieties of P. varius approaching nearly 
to the niveus are also found. 
39. Acmsea testudinalis ; the shells so named are the 
young of a variety of P. vulgata. 
121. Assiminea Grayana are only worn and small forms of 
Lacuna Vincta and L. puteola. 
Fusus Islandicus should be called F. gracilis, the former 
name has long been applied to this English 
shell, but erroneously. 
The following are additional species which have been 
satisfactorily determined since the last list was printed. 
Venus ovata, several specimens from both Cymmeran and 
Holyhead. 
Artemis lincta, a lew valves. 
Cardium echinatum, previously named C. rusticum. 
Cardium pygmseum, not very common. 
Astarte sulcata, one small specimen. 
Lucina borealis, previously named L. leucoma. 
