198 GEOL. AND NAT, HIST. SURVEY OF MINNESOTA. 



the latter. The valves are marked off by fine lines into large quad- 

 rate meshes. The dorsal abdominal processes rise separately, the two 

 anterior, however, in immediate contact at their bases. The first of 

 these is decidedly the longer, but the third process is distinct, 

 although low. The anal setae are two-jointed, the second joint the 

 shorter. The abdomen is regularly uarrowed backwards, and the 

 anal groove is provided with twelve to fifteeu teeth on each side, com- 

 monly the latter number. The terminal claws are without accessory 

 comb. The intestinal coeca are short, not longer than the diameter 

 of the eye, and extend directly forward. Length 2.0 to 2.5 mm. ; depth 

 half the length, sometimes a little more. Length of spine variable, 

 but commonly about equal to the depth of the sliell." 



As to the specific rank of this form we suspend judgment for the 

 present. 



[Daphiiia Iierinaui Daday.] 

 Daday '88. 



Head broad, compressed, front rounded, beak round, projecting 

 ventrad. Eye large. Macula nigra absent. Shell oval, with a long 

 spine. Abdominal processes discrete. Claws without teeth but orna- 

 mented with a continuous series of fine setae. Anal teeth six, dimin- 

 ishing dorsad. Length 0.5 to 0.8 mm. 



This we may unhesitatingly regard as a form of D. hyalina. 



Daphuia sarsii Schoedler. 

 Sars '60 (carinata); Schoedler '77; Elymanu '87 (carinata). 



A large yellowish species with a strong dorsal keel. Head uni- 

 formly curved, slightly concave behind the eye, with a long oblique 

 beak. Dorsal and ventral margins curved. Spine short and curved, 

 springing from near the middle of the caudal margin- The abdominal 

 processes long and united at the base. Claws without teeth. Length 

 2.5 mm. The very insufficient description may help to place a form 

 not recognized since Sars described it. 



When D. carinata King is finally placed among its congeners this 

 species will preoccupy Sars' name. 



Daphiiia paluclicola Hellich. 



A large species of a dirty yellow color. Head depressed, front 

 scarcely protuberant, ventral surface slightly concave, beak sharp, 

 short. Antennules very small. Shell deep, oval, with a short curved 

 spine springing from the middle of the caudal margin. First abdomi- 

 nal process much longer than the second, to which it is fused. Post- 



