412 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



in front. The eyes are placed farther back, and the large conspicuous 

 jaws are wanting. Under the head, the first pair of legs (pi. XII, fig. 

 78 a) are slender, three -jointed with a minute terminal segment, and lie 

 upon a delicate membranous plate on each side ; within these are a pair 

 of organs resembling what I have regarded as the maxillipeds of the 

 male. 



The first two free thoracic segments are short and curved some- 

 what around the head; the next two segments are much enlarged and 

 nearly coalescent, and the fifth free segment is nearly similar in form to 

 that of the males. The last thoracic segment is short and small and, 

 as in the male, resembles a segment of the pleon. 



Thepleon (pi. XII, fig. 78 c) differs little from that of the male, but the 

 angles of the segments are less salient. 



Length 3-4 ram ; breadth 1. 5 mra . Color "pale yellowish or waxen." Dr. 

 Stimpson was " inclined to consider" this form as the female of Praniza 

 cerina. 



The larval forms bear a much greater resemblance to the female than 

 to the male but are more slender than either, the thorax being, in the 

 smaller specimens, but little broader than the pleon. The head is broad, 

 with large prominent eyes, and is distinct from the first thoracic segment, 

 its posterior margin being truncated. The antennulte have a short 

 basal segment to the flagellum, which is followed by an elongate cylin- 

 drical segment forming about half the length of the flagellum, but 

 bearing at its end a few short segments. The mouth organs project 

 beyond the head, giving it an acute outline, and are evidently formed for 

 piercing and suction. The large jaws of the adult males are, of course, 

 wanting. The maxillipeds are slender and elongated. 



The first pair of thoracic legs (pi. XII, fig, 78 b) are elongate, with the 

 normal number of segments, a triangular carpus, and a strong curved 

 dactylus, reminding one of the legs of the Cymothoidce. The first tho- 

 racic segment is small and short and well separated from the following 

 segments. The next two segments are quite distinct in all the forms, 

 but usually the fourth, fifth, and sixth segments are united much as iu 

 the adult female. These forms appear to be the young females, and were 

 described by Dr. Stimpson under the name of Praniza cerina, / more 

 rarely, however, specimens are found in which all the thoracic segments 

 are distinct and somewhat resemble those of the adult male, but with 

 their peculiarities less marked (pi. XII, fig. 79). 



The pleon resembles that of the adults, but is not suddenly much 

 narrower than the thorax. The pleopods as well as the uropods are 

 ciliated at the tip (pi. XII, fig. 78 d). 



Both these forms of young were taken from the body of a sculpin in 

 the Bay of Fuudy in 1872, and, when fresh, their bodies were bright red. 

 In alcohol they fade to a waxy yellow. 



Adult males of this species greatly resemble Anceus elongatus Kroyer, 



