THE NAUTILUS. ii 
breakwater, I found numerous bright, perfect (dead) specimens of 
Calliostoma gemmulatum 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 Dall, Erato vitellina Hds., Mitromorpha filosa 
Cpr. or Acton (Rictaxis) punctocelatus 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 
maura Swains., and Gadinia reticulata Sby. The under side of 
some of the large stones there were covered with Astyris gausapata 
Gld. var. carinata, 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 Laguna near Three Arches, among Mytilus calt- 
fornieus Conr., Purpura lina Mart. var. emarginata Desh. were 
very plentiful, some of them larger than I had seen before. There 
was also one nice living Cyprea spadicea Gray. Upon the beach 
sand were several bright, large specimens of Trivia solandri Gray. 
These were dead, as were all but one of Muricidea incisa Brod., 
which were quite plentiful. Macron lividus A. Ad. was there, too, 
living upon the under side of large stones. 
At Catalina on the Main, upon the beach, were several specimens 
of Chrysodomus ( Kellettia) 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 rupium Sby., upon the rocks 
above extreme low tide, at a place about one mile and a half west of 
Laguna. 
NOTES ON THE PARVUS GROUP OF UNIONIDZ AND ITS ALLIES. 
BY CHAS. T. SIMPSON. 
Mr. R. Ellsworth Call, so well known as an able student of the 
American Unionide, has recently published a revision and synon- 
omy of the Parvus group of Unionide,' and I wish to call attention 
to certain points in the paper. 
The Parvus group is, in general, well characterized, consisting of 
small Unios, with brownish to blackish epidermis, rayless or feebly- 
1 Proc. Indiana Acad. Science for 1895, pp. 109-119, plates I-VI. 
