52 



shells were found — Pupa contractu, Vertigo pentodon, V. curvidens, V. 

 ovata, V. Gouldii (very common), V. simplex, V. Bollesiana, Zonites 

 milium, Z. exiguus, etc., etc. 



In a little wood near the Canada Atlantic Railroad at Archville 

 Zonites minusculus and Binneyanvs were found, together with Pwnctum 

 pygmceum in some numbers, and Pupa coutracta, Vertigo ovata, V. 

 Bollesiana and V. pentodon. 



At the outlet to Leamy's Lake, a capital locality, were found, 

 Sphcerium rhomboideum, S. partumeium and other freshwater shells 

 and a small Pisidium there taken is thought bv Mr. Latchford to be 

 P. rotundatum, new to our lists. 



But though little field work has been clone, the leaders have devoted 

 considerable time to the study of the species in their collections, and 

 they have reached the conclusion that some alterations are necessary in 

 the Ottawa lists. This is specially the case in puzzling groups such as the 

 Amnicolse and Pupidse, and papers on the local species of these groups 

 are in preparation 



Up to the present time there have been recorded in the transactions 

 of the club, 126 species of land and freshwater mollusca. Of these the 

 writers are of opinion that 5 must be dropped : — 



Amnicola Sayana, Antb. — Tr. I. iii, 57. These were A. granum, 



A. dtcisa, Hald. — Tr. I. iii, 57. These were A porata. 



Limncea lanceata, Gould. — Tr. I. iii, 58. These were L. stagnalis, 

 young. 



Physa brevispira, Lea. — Tr. I. i. 39, 62. These were P. Billingsii. 



Planorbis lentus, Say. — Tr. I. i. 39. These were P. trivolvis. 



In place of these, 6 other species can now be added : — 



Sphcerium stamineum, Conrad. Rideau River at rifle range. 



Pisidium rotundatum, Prime. Outlet to Leamy's Lake. 



Amnicola CincinnatiensU, Anth. Rideau Canal. 



A mnicola pallida, Hald , Local specimens of this species are in 

 the Geological and Natural History Survey Museum. 



Vertigo curvidens, Gould. Woods near St. Louis dam. 



Helix dentifera, Binnej'. The Ox-bow farm, Casselman. 



The number of species on the list is now, therefore, 127, namely : — 

 Freshwater bivalves, 41 ; freshwater univalves, 39 ; land shells, 47. 



