366 G. 0. SIRS, 



Remarks. — This new species somewhat resembles G. crassus in the 

 short and stout body, but is, on a closer examination, easily distinguishable 

 by the unusually short superior antennae, the different shape of the 1 st and 

 4th pairs of coxal plates, and by the form of the basal joint of the last pair 

 of pereiopoda. It also attains a somewhat larger size than that species. 



Descriittion of the female. 



The length of a fully adult, ovigerous specimen measures 12 mm. 

 The form of the body (see fig. 1) is comparatively short and stout, with 

 the anterior division rather tumid, and the back broadly rounded. 



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

 mesosome combined, and has the lateral lobes slightly prominent and evenly 

 rounded at the tip, being defined behind by a rather deep emargination. 



The anterior pairs of coxal plates are of moderate size and have their 

 distal edge conspicuously crenulated and fringed with rather long and slender 

 bristles. The 1st pair (see fig. 5) are obliquely expanded in their outer 

 part extending beneath the cephalon as far as the insertion of the inferior 

 antennae. The 4th pair (see fig. 7) are very large and expanded, being fully 

 as broad as they are deep, and are vertically truncated below the posterior 

 emargination. 



The epimeral plates of the metasome are well developed, and of about 

 same appearance as in the preceding species. 



Tlie urosome is rather short and quite smooth above, with only one or 

 two very small spinules on the dorsal face of the 2 posterior segments. 

 The eyes are of the usual oval reniform shape. 



The superior antennae (fig. 8) are unusually short, not even attaining to 

 y^ of the length of the body, and have the 1st joint of the peduncle very 

 large, exceeding in length the other 2 combined. The flagellum is scarcely 

 longer than the peduncle, and is composed of about 9 articulations. The 

 accessory appendage about equals in length the last 2 peduncular joints 

 combined, and is composed of 4 — 5 articulations. 



The inferior antennae (fig. 4), unlike what is generally the case in this 

 genus, are somewhat longer than the superior, and rather densely setous 

 posteriorly. The flagellum about equals in length the last 2 peduncular 

 joints combined, and is composed of about 7 articulations. 



The gnathopoda (figs. 5, 6) are not very strong, but of the very same 

 structure, though the posterior ones are a little larger. The propodos in 

 both pairs is of a somewhat irregular oval form, with the palm rather ob- 

 lique and defined below by a very slight angle armed with 2 spines. 



$H8.-MaT. CTp, 846. 24 



