394 Wisconsin Academy of Sciences, Arts and Letters. 



which is sharp. Eye moderate in size, showing four or fewer lenses. 

 Macula nigra about as large as eye, angular, and somewhat nearer to eye 

 than to apex of rostrum. 



Post-abdomen enlarged posteriorly, lower angle rounded, bearing 15-17 

 serrate post-anal denticles and about the same number of squamae. Ter- 

 minal claws smooth. Basal spine rather large. Abdominal setse of ordi- 

 nary length. 



MALE. 



Antennule cylindrical, with anterior sense-bristle and flagellum. Post- 

 abdomen devoid of denticles and with a row of squamae. Vas deferens- 

 opens in front of terminal claw. Basal spine large. 



Color yellowish to bright yellow, fairly transparent. Lake Mendota^ 

 in deeper water, 15-20 feet. 



This species is evidently related to A. elegans, Kurz * from which it. 

 differs in its greater size, in the reticulation of part of the shell, and 

 in the size, shape and armature of the post-abdomen. The post-abdomen 

 of A. lepida resembles in general that of A. quadrangularis, O. F. M.. 

 The species lives at the bottom in rather deep water — 15-20 or more 

 feet — and is much more abundant in Lake Mendota than elsewhere in 

 the vicinity of Madison. 



Species 45. Graptoleberis testudinaria, Fischer. 



My species G. inermis,~\ is a variety of this species. The spine on the 

 terminal claw is sometimes, though rarely, present, and the other char- 

 acters adduced for G. inermis fall within the range of variation of Eu- 

 ropean forms. 



Species 46. Dunhevedia (Crepidocercus) setiger, Birge. Plate XIIL 



Fig. 20. 



In 1888, G. O. SarsJ raised from dried mud and redescribed Dunhevedia 

 crassa of King. From his description and figures it is plain that my 

 genus Crepidocercus is identical with King's Dunhevedia, which was estab- 

 lished in 1853. The genus was named by King from Dunheved, the 

 place where the animal was found. My species differs from D. crassa, 

 King, in the reticulation of the shell and, apparently, from D. podagra, 

 King, in general form. I have not been able to see King's original pa- 

 per. D. setiger has been found in Hungary by Daday.§ 



In the latter part of August I found the males of this species. D. setiger 

 has always been one of the rarest species of Cladocera here. It was 

 rarely collected at all, and if present in a dredging was found in only 



*Kurz, W. Dodekas neuer Cladoceren. Sitzb. der K. Akad. der Wissensch. Wien; 

 1874. Separate reprint, p. 43. Description of female, Tab. II, fig. 1, female, 

 t Transactions Wis. Acad. Sci., vol. iv, p. 102, pi. I, fig. 17. 

 X Additional notes on Aust. Cladocera, 1888, p. 41, PI. 5, figs. 1-4. 

 § Daday, E. Crustacea Cladocera Faunae Hungaricae, p. 93, PL I, fig. 47-48. 



