12 THE NAUTILUS. 



ened, with or without a groove ; below it is a deep excavation ; left 

 cardinal teeth : the anterior rather stout hut its edge acute, the pos- 

 terior oblique, slightly curved ; lateral teeth stout, the outer ones of 

 the right valve quite small ; ligament strong. 



Long. 4, alt. 3.8, diam. 2.7 mill. 



Habitat : Michigan, Illinois, Ohio. 



In a lot from the Grand River, at Grand Rapids, Mich., collected 

 by Dr. Reynold J. Kirkland. in whose honor the species is named, 

 there were over two hundred specimens, most of them young and 

 half grown, in company with Pis. cotnpres&nm Pr. (thousands of dif- 

 ferent forms), Jail ax, crucialum, punctatum, and a number of other 

 species. A few from Berry Lake, Chicago, were sent by the Chicago 

 Academy of Science (Mr. F. C. Baker), and one single valve was 

 ibund in the Anglaize River, tributary to the Maumee River, Lake 

 Erie drainage, by the writer, in 1893, in company with Pis. compres- 

 sniii Pr. 



Pis. kirklandi is related to P. compression Pr., and more so to 

 fallax St. From the former, it is at once distinguished by the more 

 rounded outlines of the adult specimens ; the young are higher in the 

 anterior part, and the mussel is nearly square, while the young of 

 contpressinu are more triangular ; and in the latter, the beaks are 

 higher, the (young) mussel is of comparatively larger diameter. 

 From P. fallax it differs by its larger size, the coarse striation, the 

 shape of the ridges and the grayish color. 



Pis. septentrionale Prime. 1 The name being pre-occupied for a 

 Lapland species, P. fallax var. septentrionale St. must be changed, 

 and v. horeale is herewith proposed. 



New Philadelphia, Ohio, March, 1899. 



GENERAL NOTES. 



COCHLICOPA LUBRICA ill Alaska. In the article describing 

 Uyalina pellucida and H. arctica, Science Record, II, p. 172, 1884, 

 Mr. Lehnert records finding a specimen of the above species in the 

 same dried-plant packing material the Hyalines were found in, from 

 Point Barrow, Alaska. 



WEST COAST OYSTER HERMAPHRODITIC F. L. Washburn, of 

 the University of Oregon, has lately confirmed Prof. Schiedt's dis- 

 covery that male and female elements co- exist in the West American 

 oyster. There seems to be no evidence of protandry, mature eggs 

 and spermatozoa existing at the same time. The full account is in 

 Science for March 31. 



a Cat. Corbiculadse, 1895, p. 61, " Undescribed." 



