38 TWELFTH ANNUAL REPORT. 



As said by Kurz, this species is not easily mistaken ; the small 

 head (only paralleled by the following), the very evident reticular 

 tions and the broad abdomen give it a peculiar habitus which is 

 unmistakable. 



Head depressed, small, spiny below, not angulated; fornices^ 

 prominent, thorned; body rotund, almost spined above; shell doubly 

 reticulate; post-abdomen broad, with seven or eight anal spines;: 

 claws large, smooth. The male antennules are little larger than 

 those of the female. I have not yet seen this species in America. 



Sp. 5. Ceriodaphnia alabamensis, Herrick, 



(Plate B, Fi^. 2.^ 



(American Naturalist, May 18S3. Plate v, Figs. 11, 12.) 



This species was seen but once and is insufficiently known. The- 

 body is elongate, quadrate, the shell reticulated with double con- 

 tour lines,the head very small and produced downward below the eye,, 

 which is very small, the antennules are longer than in any other 

 species, obviously two-jointed, with a lateral seta; the antennae 

 are very long; post-abdomen long and rather narrow, with the 

 margins nearly parallel, truncate at the end, with over nine anal 

 spines; claws smooth, abruptly truncate. My drawing represents a 

 daphnia-like set of processes for closing the brood cavity. Length 

 1 mm. (?) 



Tuscaloosa, Ala. 



Sp. 6 Ceriodaplmia reticulata, Jurine, 



Monocidus reticulaius, JUKINE. 

 Daphnii reticulata, Baird, LeydIG. 

 Ceriodaphnia quadrangula, SCHOEDLER. 

 Ceriodaphnia reticulata, Sars, P. E. Mueller, Kurz, Berrick. 



Head long, obscurely angled in front of the antennules; fornices; 

 very prominent; antennules small; post-abdomen of moderate size, 

 rounded at the end, slightly tapering; about eight long anal teeth r 

 terminal claws with a series of sharp spines at the base. The re-, 

 ticulations are sharp but simple. The flagellum of the male an 

 tennule is either straight or moderately curved. Kurz says that 

 some varieties have the fornices blunt \\ thers are sharp. I 



have seen only the blunt form which is then much like the next. 



Sp. 7. Ceriodaphnia dentata, Birge. 



This form differs from the above only in having the inside of the- 

 claws fringed with minute bristles (sometimes absent), the angler 



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