no. H04. PARASITIC COPEPODS—CALIG ID M- WILSON. 661 



Genus HOMOIOTES, new genus. 



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

 Mandibles with sharp sawteeth along the inner margins only. Second 

 maxillae small and divided as in L&peophtheirus. First and fourth 

 swimming legs nniramose, second and third biramose. Genital seg- 

 ment covered by a pair of dorsal plates which finally 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 bej^ond the tips 

 of the anal lamina?. . In the male the plate covers only the genital 

 segment and does not quite reach the base of the abdomen. In this 

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

 the genital segment, the former very well differentiated. 



Abdomen unsegmented, without plates or processes; anal laminae 

 small, flattened and armed with plumose setse. 



(Homoiotes, optoiorr/s, likeness or similarity.) 



HOMOIOTES PALLIATA, new species. 

 Plate XXIX. 



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

 anteriorly and posteriorly. Frontal plates well defined but narrow, 

 completely separated by a central incision, within which can be seen 

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

 depth, and inclined outward, leaving a median lobe 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 

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

 overlaps the bases 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 t»e 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 segment. These grow inward toward each 



