THE NAUTILUS. 57 



breakwater, I found numerous bright, perfect (dead) specimens of 

 Callioatoma gemmulutum Cpr., Modiola recta Conr., Scala hindsii 

 Cpr., Siliqua patula Dixon (small specimens), Solen rosaceus Cpr. 

 and Fissurella volcano Rve., while the occasional finding of a pretty 

 Calliostoma gloriosum Ball, Erato vitellina Hds., Mitromorpha filotsa 

 Cpr. or Actceon (Rictaxis*) punctoccclatw has marked the day. 



During the low tides of the last month (November), alive upon 

 the rocks at White's Point we found a few fine specimens of Mitra 

 iniiiirii Swains., and Gndinia reticulata Sby. The under side of 

 some of the large stones there were covered with AstijrU gaitsapata 

 Gld. var. earinata, which little animals would move off at such rapid 

 pace that it required lively movements to capture them. With the 

 Astyris were a few Scala Hindsii. 



In the vicinity of Laguua near Three Arches, among Mytilus cali- 

 fo minus Conr., Purpiirn limn Mart. var. emarginata Desh. were 

 very plentiful, some of them larger than I had seen before. There 

 was also one nice living Cyprcea spadicea Gray. Upon the bench 

 sand were several bright, large specimens of Trivia solandri Gray. 

 These were dead, as were all but one of Murindea inrixa Bmd.. 

 which were quite plentiful. Macron. Uvidu* A. Ad. was there, too, 

 living upon the under side of large stones. 



At Cataliua on the Main, upon the beach, were several specimens 

 of Chryxodomus (Kelleltia) Kelletti Fbs., which had been brought in 

 by fishermen. But the " find " which I appreciated most was that 

 of a " baker's dozen " of living Semele rupimn Sby., upon the rocks 

 above extreme low tide, at a place about one mile and a half we>t of 

 Laguna. 



NOTES ON THE PARVUS GROUP OF UNIONIDJE AND ITS ALLIES. 



BY CHAS. T. SIMPSON. 



Mr. R. Ellsworth Call, so well known as an able student of the 

 American Unionidce, has recently published a revision and synon- 

 omy of the Parvu* group of Unionidx, 1 and I wish to call attention 

 to certain points in the paper. 



The Pnrt'iis group is, in general, well characterized, consisting of 

 small Unios, with brownish to blackish epidermis, rayless or f'eebly- 



'Proc. Indiana Acad. Science for 1895, pp. 109-119, plates I-VI. 



