STATE GEOLOGIST. 133 



Sp. 2. Epischura fluviatilis, Herrick. 



(Plate Q. Pigs. 14 and 16.) 



Similar to the above but smaller (.01 in.) The females are very 

 similar, though the fifth feet ai'e more elongate and differently 

 spined. The abdomen is perfectly straight and the three caudal 

 setae are of nearly ^qual size. The claw is armed with eight teeth, 

 all but the first of which are emarginate. The abdomen of the 

 male is straight, but has a strong process on the left side which 

 bears a movable claw laterally and a small second segment which 

 terminates in two small spines. The fifth foot of the male is 

 peculiar; the inner ramus (or the left foot) lamelliform, one-jointed, 

 with two opposable claws; the right branch is simple and 3-jointed, 

 in form like that of the female. Here we have the most marked 

 difference between the two species. Found in Mulberry creek, 

 Cullman county, Alabama. Although a considerable number were 

 examined no oviferous females were found, while the males contain- 

 ed the spermatophores and can hardly be thought immature, and, 

 as it is in the male that the most marked differences appear, the 

 two species seem certainly distinct. 



III. — Genus Temora, Baird. 



(Plate H. Figs. 8— 16.) 



This genus contains several marine forms and two which are 

 found also in streams opening into the sea. The species seem to 

 be as follows: T. velox, Lilljeborg, T. longicornis, Mueller, {=T. 

 finmarchia, Baird, =Diaptomus longicauddtus, Lubbock), T. 

 armata, Glaus, T. inermis, Boeck, and T. affinis, Poppe. T. 

 clausii, Hoeck, is said by Poppe to be certainly identical with T. 

 velox. Hoeck's figures are incomparably better than any of the 

 preceding, but he seems to have been misled by errors in Lilljeborg. 

 The species described by me before the Academy of Sciences of 

 Minnesota (but still unpublished) as T. gracilis, from the brackish 

 waters bordering the gulf of Mexico, agrees very closely with T. 

 affinis, Poppe. (Abhandlungen v. naturw, Vereine z. Bremen, 

 1880, p. 55.) This name must therefore take precedence. This 

 species has been found in the Rhioe and rivers flowing into the 

 gulf of Mexico, as well as in the marine or brackish waters into 

 which these rivers flow. The occurrence of the genus in American 

 fresh waters, justifies its mention here. 



