72 CRUSTACEANS OF THE 



is one third broader than that described in the » Archiv 

 fur Naturgeschichte". As is proved by the measurements, 

 the proportion between the greatest width and the length 

 of the cephalothorax is somewhat variable in our speci- 

 mens , but in all these the cephalothorax appears, however, 

 slightly more enlarged than in the type with which 

 our specimen was compared. The carapace is little en- 

 larged, the greatest width is in proportion to 

 the length as 4:3 and is observed just behind the 

 epibranchial teeth, on the limit of the foremost third of 

 the upper surface. The upper surface is somewhat convex 

 from before backwards, less so, although still distinctly, 

 from side to side. The mesial cresceutic portion of the 

 cervical groove is distinct and moderately deep, excepted 

 just in the middle, but the lateral portions are inter- 

 rupted (Fig. 4) ; the median part of the semicircular 

 groove is just twice as far distant from the free border of 

 the front as from the posterior margin of the carapace. 

 The anterior lateral portions between the gastric region 

 and the anterior branchial one are two rather deep, 

 oblique furrows, that in the adult end about 4 mm. 

 short of the notch that bounds the epibranchial tooth 

 anteriorly. A post- frontal crest cannot be said 

 to exist as it is only represented by the wrinkled 

 and rugose slope, with which the gastric region subsi- 

 des towards the front and the post-orbital furrow. The 

 epigastric portion, however, is more or less 

 distinct and slightly bent forwards; the mesogastric 

 furrow is linear, very narrow and shallow, not con- 

 tinued on to the front nor backwards and not bifurcating, 

 so that the anterior extremity of the mesogastric area, in 

 other species well-defined, is not at all distinct. 



The anterior branchial region is moderately swollen, 

 scarcely marked off from the posterior one; shallow depres- 

 sions separate the posterior branchial and the cardiac re- 

 gions from the intestinal, but the cardiac region is scar- 

 cely limited off laterally. The small, somewhat wrinkled 



Notes from the Leyden Museum , Vol. XXI. 



