738 PROCEEDINGS OF THE NATIONAL MUSEUM. 



owing to the direction of its sides; the base is rather broad and the 

 sides at first flare outward for one-third their leng^th and then turn 

 abruptly inward. The papilla? are situated in fhe angles formed by 

 these abrupt turns, and are hence marginal, unlike any other known 

 species. 



The antenna? are each armed with a pair of large triangular spines 

 upon their basal joints. These also serve as a distinguishing mark, 

 as no other known species possesses them. The teeth on the basal 

 plate of the second maxillipeds are regular saw-teeth and are set 

 close together. The three posterior pairs of swimming legs project 

 considerably beyond the edge of the carapace, but the first pair only 

 just reach it. 



Flagella are present only on the first two pairs of legs. There are 

 none on the third pair. 



The testes in the male are enormous compared with the size of the 

 animal, and not only occupy all the basal portion (considerably more 

 than half) of the abdomen, but they also bulge out prominently on 

 both the dorsal and ventral surfaces, giving the impression that they 

 are full to bursting. They are each three-lo))ed (fig. 90). 



Color. — From a clear brownish yellow to a red-ln-own, varying with 

 age. The entire dorsal surface is covered with l)rown pigment spots, 

 small and scattered on the carapace and thorax, larger and closer 

 together on the abdomen. These pigment spots are much branched 

 and each possesses a clear circular area near the center. The pigment 

 on the ventral surface of the abdomen follows the creases between the 

 lobes of the testes, leaving the lobes themselves a free color. 



Length, 5 mm. (from 0.5 to 7 mm.); length of carapace, 3.5 mm.; 

 breadth of carapace, 8.5 mm.; length of abdomen, 1.6 mm.; breadth, 

 1.10mm. 



IIahitat.^Fi\m\ Bu])oka in Western Nyansa, Africa, upon frog 

 tadpoles. 



{jRanarif///= of or pertaining to frogs). 



These specimens were obtained by Dr. Stuhlmann from the external 

 surface of the tadpoles, where they fix themselves to the skin by the 

 hooks on the anterior maxillipeds. 



They were very common, and often 5 or 6 were found upon the same 

 host. Rarely they attached themselves inside the branchial cavity. 



That they are similar in their habits to Argulus with such difter- 

 ences as are necessitated l)y the difi'erence in structure of their first 

 maxillipeds, can be seen from the following statement n)ade bv Bou- 

 vier (1899,- p. 13): 



Les divers individus etaient fixes a la peau de leur hote par leur bord anterieur, 

 le reste du corps etant libre; leurs pattes notatoires etaient animc^^es d'un mouvement 

 actif, assurant ainsi les ^changes respiratoires. lis se detachaient lil)rement on se 

 laissaient enkver avec des piiices, apres quoi ils nageaient avec vivaeite dans I'eau 

 de lu cuvette ou ils etaient renfermes. 



