General Notes. [March, 



at Jackson, Miss., collecting fishes and, incidentally, other 

 rials. While engaged in searching in the mud and among 

 fallen leaves in a pool formed by a spring along the Pearl 

 r, I found some specimens that prove to belong to Asellus 

 The individuals are all of small size, none exceeding 

 about 7 mm in length. That they are mature, however, is shown 

 by the fact that several of the females bear numerous eggs be- 

 neath their oostegites. They appear almost as pigmies beside 

 the Illinois variety, ntilitaris. The discovery of these specimens 

 in this locality shows that this species has a very wide geographi- 

 cal distribution. 



Maucascllits tenax Harger. — ( Asellus ienax Smith, S. I., 

 Amer. Jour. Sci., 1871, 453- Aselbpsis tenax Smith, S. I., Fresh- 

 water Crustacea U. S. 659. Mancascllus tenax Harger, Amer. 

 Jour. Sci., 1876, 304.) Along with the species of Asellus men- 

 tioned above as occurring in the neighborhood of Irvington, and 

 in equal abundance, is found Mancascllus tenax. It was origin- 

 ally described from specimens obtained about the great lakes of 

 Michigan, and I am not aware that it has hitherto been noticed 

 anywhere else. The specimens that I have collected here appar- 

 ently belong to Mr. Harger's variety dilata ; but are in some 

 respects different both from this variety and from the typical 

 forms. The flagellum of the antennae may have as many as forty- 

 five segments. The propodite of the first thoracic foot is oval, 

 swollen, and armed with three teeth, being in these features like 

 dilata, but differing in that the larger tooth is the one at the pos- 

 terior angle, instead of the middle one. This largest tooth is 

 fully one-third as long as the dactyl. There is a prominent lobe 

 or tooth on the concave side of the dactyl, about the middle of 

 its length. On the outer surface of the mandible I have observed 

 a small tubercle, situated apparently in a 'slight depression and 

 armed with a hair. This I have been inclined to regard as a rudi- 

 ment of the mandibular palpus. 



Eubranchipus vcrnalis Verril! -nail's Verrill, 



A. E. Packard, A. S, Jr., Hayden's Rep. Geolog. 



and Geog. Sur., 1874, 622.) Large numbers of this crus- 

 tacean, so interesting on account of its curious form and structure, 

 its habits, its beautiful colors, and its graceful movements, were 

 taken from ponds in Irvington, during the winter of 1879-80. 

 During this period the weather was unusually mild, and the 

 waters remained unfrozen during the greater part of the season. 

 About the first of December I caught a single specimen of what 

 was evidently an Eubranchipus. It was but partially developed, 

 and I supposed that it would turn out to be E. serratus Forbes. On 

 the 1 oth of January I collected several full grown specimens of 

 the same animal in the same pond, and a careful examination 

 showed that they belonged to Professor Verrill's E. vcrnalis. The 

 ponds in which I have taken specimens here are, some of them 



