1913] The Ottawa Naturalist. 19 



PRELIMINARY LIST OF OTTAWA SPH^ERIIDiE. 



In the Naturalist for March, 1890, the late Revd. Geo. W. 

 Taylor and the writer published a catalogue of the recent 

 Mollusca of Ottawa, as recorded in the publications of the Club 

 up to that time. The list included five Splicer ia sulcatum, 

 striatinum, stamineum, rhomboideum and occidentale ; four 

 Musculia partumeium, securis, rosaceum and truncatum; and 

 five Pisidia virginicum (as adamsi), compression, abditum 

 ventricosum, and rotundatum . Three of the Pisidia are listed with 

 a (?), indicating doubtful identification. 



In many of the years that have since elapsed, but little 

 work was done. Not much leisure until recently fell to the lot 

 of an}- of the remaining few who were disposed to interest them- 

 selves in things so uncommercial as our inland shells. During 

 the past three summers, however, opportunities afforded for the 

 first time were taken advantage of. The hunting grounds of 

 other davs and manners were revisited, and new ones sought 

 farther afield. A very large quantity of material was collected 

 some species in thousands and submitted to Dr. V. Sterki of 

 the Carnegie Museum, who is recognized the world over as the 

 supreme authority in the Sphceriidce. The list which follows 

 has in every case "the sanction of- his identification. I am under 

 the deepest obligation to him. I also desire to acknowledge my 

 indebtedness to Mr. C. W. Johnson, of the Boston Museum of 

 Natural History, for his kindness in comparing specimens from 

 Ottawa with Prime's types, or with shells bearing Prime's labels. 

 Dr. Sterki has in addition generously presented me with co-types 

 of many of the species which he has described. 



While the list which follows is intended to be merely pre- 

 liminary, it is believed to be correct as far as it goes. No species 

 has been included from localities not in the Ottawa Valley, and 

 with few exceptions the shells have been found within or near 

 the limits of the Capital City. 



Sph^erium. 



1. S. sulcatum, Lamck. 



2. S. striatinum, Lamck. 



3. S. stamineum. Con. 



i. S. rhomboideum. Say. 



5. S. occidentale, Prime. 



6. S. aureum, Prime. 



7. S. crassum, Sterki. 



S. S. emarginatum, Prime. 

 9. S. flavum, Prime. 

 10. S. torsum, Sterki. 



