CRUSTACEA CASPU. 445 



The urosome has noue of the segments produced dorsally, aud is clothed 

 with a few small haii's. 



The cephalon does not quite attain the length of the first 2 segments of 

 the mesosome combined, and has the lateral lobes very short and blunted at 

 the tip. 



The anterior pairs of coxal plates are comparatively small, being but 

 little deeper than the corresponding segments, aud have their distal edge 

 fringed with scattered bristles. The 1st paii' (see fig. 4) are slightly ex- 

 panded in their outer part, which is evenly rounded off. The 4th pair (fig. 6) 

 have the posterior expansion transversely truncated, and edged with 5 bristles. 

 The posterior pairs are normally developed. 



The last 2 pairs of epimeral plates of the metasome are considerably 

 larger than the 1st, and have the lateral corners slightly produced. 



The eyes are of moderate size, aud are oblong oval in form, without 

 any sinus anteriorly. 



The superior antenuiE (fig. 2) somewhat exceed half the length of the 

 body, and have the 1st joint of the peduncle much thicker, and also longer 

 than the 2nd. The flagellum is very sleuder, being about twice as long as 

 the peduncle, and is composed of about 20 articulations. The accessory ap- 

 pendage (see fig. 3 ) does not attain the length of the last peduncular joint, 

 and is 3-ai'ticulate. 



The inferior antenna; are rather poorly developed, being in female 

 scarcely half as long as the superior. In the male they are, as usual, some- 

 what longer. 



The gnatliopoda exhibit the usual structure, being rather small in the 

 female (figs. 4, 5), whereas iu the male (figs. 10, 11) they are much stronger, 

 with the propodos large and somewhat expanded distally, the palm being in 

 both paii's somewhat oblique and defined below by an obtuse corner, armed 

 with several strong spines. 



The pereiopoda are comparatively short and stout, and have their outer 

 part edged with a restricted number of slender, fasciculated bristles. The 

 basal joint of tlie antepenultimate pair (fig. 7) exhibits the usual oval form; 

 that of the penultimate pair (fig. 8), on the other hand, especially in the 

 female, is unusually broad, being rounded quadrangular in form, with the 

 posterior expansion evenly curved. The basal joint of the last pair (fig. 9) 

 is, as usual, still larger, aud obliquely expanded, so as to form a greatly 

 projecting rounded lobe, extending in the female eveu to the middle of the 

 meral joint. In the male (see fig. 12) however, this lobe is, somewhat less 

 prominent. 



4'H3.-MaT. CTp. 275. 2) 



