Diaptomus Pseudosanguineus Sp. Nov. 25 



Marsh, C. Dwlght, ('18). Copepoda. Fresh-water Biology, by Henry 



B. Ward and George C. Whipple, pp. 741-789. 1918. 

 Schacht, P. W. ('97). The North American species of Diaptomus. 



Bull. 111. State Lab. of Nat. Hist. 5:97-207. pi. 21-35. 1897. 

 Turner, C. H. ('10). Ecological notes on the Copepoda and Cladocera 



of Augusta, Ga., with descriptions of new species. Trans. Acad. 



Sci. St. Louis 19:151.176. pi. 36-38. 1910. 



Explanation of Plates 



PLATE I. 



Pig. 1. Diaptomus p$eudosanguineou*, sp. nov., ventral Ylew of 

 female; c, tubercles on the distal margin of the thorax; d. strong 

 curved spine on the lateroventral portion of the first segment of the 

 abdomen. 



Fig. 2. Diaptomus pseudosanguineou*. sp. noT., lateral riew of 

 male. 



Fig. 3 Lateral view of the female; j, spermatophore. 



Fig. 4. Antenna of the female. 



PLATE II. 



Fig. 1. Lateral view of female illustrating a eaae of commensal- 

 ism between this form and certain Vorticellldae; e, one of the com- 

 mensal Vorticellldae. By examining that portion of the illustration 

 labeled e with a magnifying glass the protozoan will be distinct. The 

 use of the glass will also reveal retracted Vorticellldae among the 

 eggs. 



Fig. 2. Caudal extremity of the thorax and the first abdominal 

 somite of a female (lateral view); f. stout curved spine; g, sperma- 

 tophore. 



Fig. 3. Antipenultlmate segment of the male right antenna; h, 

 terminal claw; i, hyaline flange. 



PLATE III. 



Fig. 1. Fifth foot of the male; a, endopodlte of the left fifth foot 



Fig. 2. Antennae of the male. 



Fig. 3. Pair In copulo. 



Fig. 4. Enlarged view showing the tubercles on the caudal mar- 

 gin of the thorax; b, the tubercles. 



Fig. 5. Fifth foot of the female. The terminal setae moved re. 

 flexly, while the photo was being taken, thus causing the appendage 

 to appear to have several terminal setae. There are only two long 

 setae at that place. 



PLATE IV. 



Fig. 1. Ceriodaphnia rigaudi, shell markings. 



Fig. 2. Ceriodaphnia rigaudi. Female, b, antennae c, beak-like 

 projection from head. 



Fig. 3. Moina brachiata, female, showing commensalism; a. Voiti- 

 cellidae. 



Fig. 4. Pleuroxus hamulatus. 



Fig. 5. Ceriodaphnia laticaudata. 



Fig. 6. Ceriodaphnia rigaudi, female, showing the escape of a 

 young specimen from the brood sac. By turning the page sidewlse 

 the details of this photo become more distinct. 



