GAMMARIDEA. 353 



antennae have the flagellum about as long as the base, and together 

 they are as long as two-thirds the base of the inferior antenna. 

 The third joint of base of inferior pair is about once and a half times 

 as long as second joint, The joints of the flagellum are very short, 

 and have each three or four minute spines at apex. There are 

 many similar short spinules on the basal portion. The mouth is pro- 

 minent, making the whole height of the head twice its length. The 

 maxillipeds have an obtuse extremity, and the last three joints are 

 rather broad. The first pair of feet is a little longer than the second, 

 and terminates in a large claw, slightly curved, which does not fold 

 against the preceding joint ; fourth joint oblong and rather stout ; the 

 fifth much smaller than fourth ; all the joints furnished with short 

 spinules, especially the penult, which is thickly beset with them. The 

 hand of the second pair is a small, flat, oblong joint, subspatulate in 

 form, and having the short finger on the dorsal margin not reaching 

 to apex, and lying in a line with the dorsal margin of the joint. The 

 third joint is subquadrate, and bears the fourth by its anterior side. 

 Spines or setae of joints short. Third and fourth pairs subequal, 

 the third a little the largest, and hardly exceeding half the length of 

 the seventh pair. The spines are rather numerous on the joints of 

 the three last pairs; on the penult joint of the fifth pair there are five 

 or six pairs of spines along the lower margin, besides other spinules 

 smaller, and as many pairs on the upper or dorsal margin, half the 

 length of those below. The stylets are slender. The first pair is 

 much the longest, and extends far beyond the others. There are 

 numerous short spinules on the upper margin, and both branches of 

 the first pair are thus spinulous, there being seven or eight sets of 

 spinules. The third pair is about one-third as long as the first. The 

 seventh abdominal segment is D-form, and has the surface and margin 

 covered with minute spines. 



The male of this species was not obtained, unless it be the Or- 

 chestia Quoyana, Edwards, which is barely possible, as the legs and 

 caudal stylets are somewhat similar in their setae. The flagella of 

 the inferior antennae of the 0. Quoyana are less transverse, being as 

 long as broad, but the number of joints is nearly the same, being 

 about twenty-five ; the setules appear to be shorter and fewer. If the 

 0. Quoyana proves actually to be the male of the Talitrus here 

 described, the species will belong to the subgenus Talorchestia. 



Talitrus novi-zealandise, Dana, Proc. Amer. Acad. Sci v Boston, ii. 201. 



214 



