THE NAUTILUS. 59 



in 1822, in the Journ. Acad. Nat. Sci., Phila., ii, p. 317. It re- 

 sembles the previous species very closely, but is distinguished from 

 it as follows : The shell is much smaller, being only one inch in 

 length, half an inch in height, and j% in breadth. The valves are 

 more convex, thinner and more lranspai*ent, the epidermis is pale 

 yellowish-brown and the interior purplish-white ; the scalloped edges 

 of the epidermis are rounded, wliile in borealis they have a square 

 appearance, very thin at the ends and rolled back. In young speci- 

 mens the epidermis is entire (not slit as in the older ones). It is 

 not a very common species but is found quite plentifully in ]March 

 and April in Xarragansett Bay. They live at and below low water 

 in sand and in mud. 



FA^IILY CRASSATELLID^. 



Not represented in North America. 



FAMILY ASTARTID^. 



This family is divided into two sub-families, Astartinre and Car- 

 ditinje. 



SUB-FAMILY ASTARTIN.E. 



This family contains fifteen genera, thirteen of which are fossil. 

 (To be continued.) 



GENERAL NOTES. 



Mr. W. G. BiNNEY has in preparation a Third Supplement to the 

 Terrestrial mollusks vol. V, in which it is purposed to bring the sub- 

 ject up to date, and figure and describe the species discovered since 

 the publication of the Second Supplement two years ago. 



Hyalina Sterkii Dale. A tiny species of Connlus or Hyalina 

 discovered by Dr. V. Sterki in Ohio, is described by Dr. Dall in 

 Proc. U. S. Nat. Mus. 1889 (separate copy received Aug. 24 ). It is 

 scarcely over a millimeter in diameter, and about a half that height. 

 It will be figured in a later number of The Nautilus. 



Hemphillia and Prophysaon have both been collected bv 

 Henry Hemphill at Old Mission, Coeur d'Alene, Idaho. ( W. G. 

 Binney, in letter to Ed.) This extends the range of these peculiar 

 slugs considerably eastward. In this part of the Northwest many 

 other Pacific slope forms extend eastward and mingle with the East 

 American types. 



