STATE GEOLOGIST. 



."MABSH OOLLECTiON ■ 2'i9 



and ill not having tiie distal margins spined (except in some cases?) 

 and fro n the latter in size and arrangement of caudal set^e. 



Thorax large; abdomen rather slender; stylets rather slender with 

 the lateral seta well towards the end; second and third setae alone 

 long, weakly pectinate; last joint but one of abdomen sometimes 

 toothed along the distal, under margin; maxillipeds as in C. gigas ; 

 jaws with large teeth; antennae very short not reaching to the base of 

 the first cephalothoracic segment; formula — r^ — ^w — ^^ww 

 s^w^^-^^--; fifth foot two-jointed, the proximal joint very 

 broad with a strong spine, second joint cylindrical with a long seta 

 and a very short spine near the end; operculum vulv^ somewhat 

 heart-shaped; egg sacs oval-elongated, reaching beyond the end of ab- 

 domen; length yVo cm. including stjdets and setae. 



This is one of the largest and finest as well as rarest of our forms 

 and loves, as it appears, lakes having outlets. 



Sinall forms with seventeen- jointed Antennce. 



CYCLOPS i^AVUS, Sp. UOV 



(Plate y, figs. 6-13-15-lTO 



Closely related to Cyclops piiJcheUus, Koch, and to Cyclops strenims, 



Fischer. 



Rather slender; abdomen long; stylets about three times as long as 

 last segment of abdomen; lateral seta leather stout; outer and inner 

 terminal setse minute ; middle ones of moderate length ; antenna short, 

 reaching barely to or but little bevond the end of first segment; for- 

 n,ula --w_r___^^^^^w^---; fifth feet two- 

 jointed, terminal joint large, with two considerable spines; operculnm 

 vulvse of peculiar shape; length ^^o cm. excluding setae. 



Quite abundant and perhaps passing into the following. 



CYCLOPS PARCUS, Sp. UOV. 



(Plate yi, figs 12-15 ) 



Almost exactly like the last but not yet found in the same waters. 

 Distinguished by the broad and short basal joint of the fifth foot 

 which extends into a process carrying a spine, the slender second joint 

 with a single long spine and a short thorn, and by the oval shape ot 

 the operculum vulvae. 



