254 CARCINOLOGICAL STUDIES. 



red a male. I must, however, remark that in his figure 

 the ambulatory legs appear comparatively a little less 

 slender than in our individuals , which is especially the 

 case with the propodites and dactylopodites. 



I now describe the larger female (fig. 5). The cephalo- 

 thorax appears nearly quadrate; it is, however, a little 

 broader than long and even the distance between the ex- 

 ternal orbital angles surpasses somewhat the length. Dana's 

 male specimen , being of a somewhat larger size , presents 

 the same proportions. The upper surface is slightly con- 

 vex, it appears smooth to the naked eye, but is minutely 

 punctate when seen under a lens. In the younger indivi- 

 dual it bears some small tufts of hair anteriorly and on 

 the branchial regions. The ordinary interregional furrows 

 are well marked and the branchial regions are obliquely 

 plicate as usual. The front is nearly perpendicular. The 

 upper margin is divided by a tolerably deep median groove 

 and slight lateral ones into four lobules , the two internal 

 of which are a little broader than the external; the for- 

 mer are almost smooth , but the external appear finely 

 granulate, when seen under a lens. The lateral margins of 

 the front are somewhat divergent , so that the inferior 

 margin, which is almost four times as broad as the height 

 of the front, appears a little broader than the superior. 

 The lower margin shows a slightly sinuous edge, with a 

 small , shallow sinus in the middle and a very slight one 

 on each side. The front is somewhat granulate. 



The branchial regions are slightly swollen. The almost 

 parallel lateral margins of the cephalothorax are entire 

 and rather sharp ; the posterior margin finally is a little 

 less broad than the front and exactly half as broad as 

 the distance between the external orbital angles. The ter- 

 minal segment of the female abdomen is almost entirely 

 pushed into the preceding. 



The anterior margin of the arm of the chelipedes is 

 unarmed , but minutely granulated , like the two other 

 margins. The finely granulated wrist presents an acute , 



Notes from the Leyden Mluseura, "Vol. ^IV. 



