CARCINOLOGICAL STUDIES. 15 



proceeds from the last aiitero-lateral tooth obliquely forward 

 and inward. The upper surface of the front appears like- 

 wise slightly rugose and granular. Now 1 must 

 remark that these rugosities are considerably less developed 

 in Epix. subcorrosus than in Epix. corrosus. These rugosities 

 are also observed on the postero-lateral sides , immediately 

 behind the oblique grauulated line. The rest of the upper 

 surface of the cephalothorax is quite smooth as in Epix. 

 frontalis , and appears only minutely punctate when seen 

 under a magnifying glass; the points are, however , a little 

 more distinct and more crowded than in Epix. frontalis. 



In Epix. corrosus, on the contrary, the whole upper 

 surface appears distinctly granulated. 



As regards the form of the front and the size and the 

 shape of the orbits , our species almost entirely agrees with 

 Epix. frontalis , but the distance between the external 

 orbital angles fand consequently also the front) is a little 

 broader in proportion to the breadth of the cephalothorax 

 in Epix. frontalis than in Epix. subcorrosus , as is shown 

 by the measurements given below. Thus the upper margin 

 of the orbits is entire and the lower one does not present a 

 hiatus near the external angle, which is not at all prominent. 

 The antero-lateral margins are comparatively as long as 

 those of frontalis and are , quite as in this species , divided 

 into four lobes; these lobes are similar to those of Epix. 

 frontalis and are separated by notches of quite the same 

 form , but the third lobe is comparatively a 

 little longer. Iq Epix. frontalis the second anterola- 

 teral lobe is one and a third , in Ejjix. subcorrosus scarcely 

 one and a seventh as long as the third lobe. At first sight, 

 therefore, the second lobe appears distinctly longer than 

 the third in Epix. frontalis., but scarcely so in Epix. 

 subcorrosus. 



The lower surface of the cephalothorax at the subhe- 

 patic region is only minutely granular in Epix. frontalis , 

 but moreover slightly rugose in the other species. The basal 

 joint of the outer antennae of Epix. frontalis is , for a 

 Notes from ttie Ley den IVLuseuixi , Vol. XJII. 



