73 



minal joint produced at the tip to a long digitiform process. 2nd and 3rd pairs 

 of legs with the outer ramus very short, Inarticulate. Last pair of legs in female 

 very large, with the inner expansion of the proximal joint broad and vaulted, 

 distal joint somewhat dilated towards the end, with a single short apical seta. 

 No true ovisac present in female. Male spermatophore-reservoir very prominent. 

 RemarJcs.The type of this new genus is Amymone xplncrn-a of Claus, 

 which, though resembling the species of Tegastes, as regards external appearance, 

 exhibits some well-marked differences in anatomical details, which entitle it to be 

 separated generically. The 4 new species of Tegastes recently described by Mr. 

 A. Scott from Ceylon, also seem, according to the structure of the anterior antennae 

 and the natatory legs, to be more properly referable to the present genus. 



46. Parategastes sphaericus (Glaus). 



(PI. XLIII). 

 Amymone splicerica, Clans, Die freilebenden Copepoden, p. 114, PI. XX, figs. 1- 9. 



Syn: Amymone nigrans, Scott. 



Specific Characters. Female. Cephalic segment with a well-marked chi- 

 tinous stripe across the back, postero-lateral corners moderately produced, obtusely 

 acuminate, rostrum slightly prominent at the tip. Genital segment produced below 

 to a rather massive, nearly quadrangular prominence, with the anterior corner 

 somewhat exserted and tongue-shaped, the posterior unguiform and recurved, and 

 exhibiting in the middle, between the two, a smaller recurved dentiform projection 

 on each side. Distal part of urosome only slightly prominent. Anterior antennae 

 rather slender, 7-articulate. Posterior antennae with the outer rarnus extremely 

 small, bisetose. Posterior maxillipeds of moderate size, hand oblong fusiform in 

 shape. 4th pair of legs with the inner ramus extremely slender, terminal joint 

 linear, without any lateral setae, apex armed with 2 unequal spines. Last pair 

 of legs with the distal joint extending somewhat beyond the tip of the inner ex- 

 pansion of the proximal joint, the outermost of the lateral setae much elongated. 



Male resembling the female in external appearance, but having the pos- 

 tero-lateral corners of the cephalic segment transversely truncated at the tip. 

 Anterior antennae, as usual, prehensile, with the 4th joint rather large, the last 

 claw-shaped. Last pair of legs very narrow, with the proximal joint not expanded, 

 distal joint linear, with 2 slender setae at the extremity. Spermatophore-reservoir 

 very large, terminating in 2 acute lappets. 



'b*- 

 10 Crustacea. 



