i!C) CHUSTACEANS OF THE 



carinate, but for the rest the margin is rounded. An epi- 

 branchial tooth, even an epi branchial notch, 

 that e. g. is observed in Geothelphusa Kuhli de M., are 

 wanting completely. The gastric, cardiac and bran- 

 chial regions are densely punctate, for the rest smooth ; 

 the puncta are somewhat larger on the protogastric lobes 

 than posteriorly. The slightly concave posterior margin of 

 the cephalothorax is, in the male, about once and a half 

 as broad as the free border of the front, in the female 

 somewhat broader. 



The orbits are transverse, their width measures two 

 thirds of the free border of the front and they are once 

 and a half as broad as high (Fig. 13*). The lower margin 

 that is finely crenulate, is slightly arcuate, without a notch 

 near the outer angle and the obtuse- inner angle is not 

 prominent. The eye-peduncles are finely granular. 



The oblique raised lines of the lateral margin of the 

 cephalothorax pass forwards on to the inflected portion of 

 the carapace, i.e. to the branchial floor; a smooth inter- 

 space, though no furrow, separates it from the subhepatic 

 region, which is likewise beset with several raised lines, 

 running, however, more transversely. The groove between 

 the subhepatic region and the branchiostegite is deep and 

 the latter is also covered with transverse and oblique, 

 prominent, raised rugosities. The median process of the 

 posterior border of the epistome is prominent, obtuse. 



The well-marked ischial line on the slightly punctate 

 outer foot-jaws runs much nearer to the inner than 

 to the outer margin and is not continued to the 

 anterior margin of the ischium-joint; the merus-joint is a 

 little broader than long, the curved outer margin makes 

 an obtuse angle with the shorter, very slightly concave 

 anterior margin (Fig. IB*^). 



The sternum of the male is smooth, finely punctate. 

 The distance between the anterior extremity of the abdomi- 

 nal cavity and the posterior oblique margin of the buccal 

 frame (Fig. 13»') is a little broader than the distance 



Notes from the Leyden. IMiaseum, Vol. XJX.I. 



