Crttstacea. 237 



Second antenna. Basal joint of peduncle large and bearing a 

 long slender spine externally at the base of the antennal squame. 

 The spine bears a row of forwardly directed teeth on its inner 

 margin. The squame is of moderate size, outer margin straight, 

 terminating in a small tooth, distal margin somewhat rounded, only 

 very slightly projecting beyond the tooth and like the inner margin 

 setose ; setae long. The multiarticulate flagellum is of moderate 

 length and supported on a three-jointed peduncle, the proximal joint 

 is small and the following one the longest, the three together being 

 about three-quarters the length of the squame. 



Mandible. Cutting edge irregularly dentate, the two jaws being 

 dissimilar. The molar process is large and its extremity covered 

 with closely set ridges. The palp is very long, three jointed. The 

 basal joint is short, the middle one is the largest, but only by a little, 

 and sparingly setose. The terminal joint is more slender, and near 

 the distal extremity bears a few stout setae, the terminal ones being 

 long and pectinate. 



First maxilla normal ; the free margin of the coxa is rounded 

 and bears spinose setae, those which are proximally situated being 

 the longest ; the inner margin of the basis is truncate and beset with 

 short spines. The palp is ovoid and carries a few stout setae. The 

 epignath is very large and thin, ovoid and without setae. 



Second maxilla. The coxa and basis are both bilobed ; in the 

 former case the lower lobe is the largest, and in the latter the distal 

 lobe is nearly twice the size of the other. The lower coxal lobe is 

 rounded, the other lobes merely having their angles more or less 

 rounded off. The inner margin of both segments of the two joints 

 are closely beset with stout setae, most of which are spinose, and 

 they occur on the surface of the appendage, some distance from its 

 edge. The palp is ovoid, and a little longer than the basis ; it bears 

 comparatively long setae on its inner edge. The epignath is narrow, 

 about as long as coxa and basis together, and is sparingly setose. 



Maxillipede. The dactylus is about half the length of the propos, 

 and the carpus has the same proportion to the meros. The ischium 

 is the longest joint, twice the length of the meros, and slightly 

 exceeds the exopodite in length. Its inner margin is provided 

 rather sparingly with comparatively short setae and long plumose 

 setae throughout its entire length. The exopodite consists of a 

 basal portion, which terminates on the outside in an obtuse point, 

 and a terminal natatory portion setose only on the outer margin. 

 The proportions of the first maxillipede practically hold good for 

 the two following appendages, the ischium, however, increasing in 



