NO. 1404. PARASITIC COPEPODS—CALTaiD.l^— WILSON. 661 



Genus HOMOIOTES, new genus. 



Carapace large and shield-.shaped. Frontal plates without lunules. 

 Mandibles with sharp sawteeth alon^ the inner niarg'ins only. Second 

 niaxilhe small and divided as in Lepeophtheivux. First and fourth 

 swinunino- legs uniramose, second and third biraniose. Genital seg- 

 ment covered by a pair of dorsal plates which finall}^ fuse into one. 

 In the female this plate often grows forward and covers the free seg- 

 ment as well as the genital segment, overlapping- the bases of the 

 fourth legs. It extends backward to the center of the abdomen and 

 on either side of the latter sends out a well-rounded, flattened lobe, 

 terminating- in a stout blunt spine which reaches even beyond the tips 

 of the anal laminfe. In the male the plate covers only the genital 

 segment and does not qviite reach the l)ase of the al)domen. In this 

 latter sex a pair of tifth and a pair of sixth legs are plainly visible on 

 the genital segment, the former very well diflerentiated. 



AI)domen unsegmented, without plates or processes; anal laminae 

 small, flattened and armed with plumose setas. 



{Homoloten^ ofxoiorip^ likeness or similarit3\) 



HOMOIOTES PALLIATA, new species. 

 Plate XXIX. 



Female. — Carapace orbicular, as long as wide, much narrowed 

 anteriorly and posteriorly. Frontal plates well deflned but narrow, 

 com])letely separated by a central incision, within which can be seen 

 the remains of a frontal filament. Posterior sinuses narrow, of medium 

 depth, and inclined outward, leaving- a median lo])e fully half the entire 

 width and rather flatly rounded posteriorly. The lateral lobes are 

 narrow, sharply rounded, and curved strongly inward. Thoracic area 

 rather small, the groove which separates it from the cephalic area 

 being made up of two straight lines inclined toward each other like 

 the sides of a roof. The digestive glands in the center of the area 

 show plainly and are semicircular in shape. 



The free segment, seen from the ventral surface, is about half the 

 width of the genital segment and less than a third as long. In the 

 adidt its dorsal surface is entirely covered by a mantle or lamina which 

 overlaps the ))ases of the fourth legs on either side and extends back 

 the entire length of the genital segment and half the length of the 

 abdomen. 



This lamina belongs really to the genital segment and grows forward 

 over the free segment as can be seen in all young females, all males, 

 and in several of the adult females, where the free segment is without 

 any covering. It starts as a pair of small plates, one on either side at 

 the base of the genital segnient. These grow inward toward each 



