66 Bulletin Vanderhilt Marine Museum, Vol. V 



The antennae have the basal peduncular article very short, with 

 its outer distal angle produced to form a spinule that closes the orbital 

 sinus ; the second peduncular article is substantial, wide and elongate, 

 the third smaller ; the flagellum is about one and two-thirds times the 

 length of the long diameter of the orbit. 



The external maxillipeds are squarish, close-fitting, with the exopo- 

 dite rodlike, extending to midway the outer margin of the merus ; the 

 ischium has a longitudinal sulcus on the outer surface, the inner 

 lateral margin setose, the distal margin sinuate ; the merus is two-thirds 

 as long as the ischium, with the inner distal margin rounded, and the 

 outer distal margin rounded and sort of truncate; the palp is quite 

 setigerous along the lateral margin; the basal article stout, the other 

 two articles tapered. 



The chelipeds of the large old males are three or more than three 

 times as long as the carapace, while those of the females and younger 

 males are about two and one-half times as long as the carapace; the 

 ischium is armed with a spine at the inner distal angle; the merus 

 is trigonal and there are three evenly spaced, acute, procurved spines 

 along the anterior lateral margin ; there is a spine at the outer distal 

 angle of the merus and a blunt node at the upper distal angle and a 

 larger blunt protuberance at the inferior distal angle. The carpus 

 has a spine each at the outer and inner distal angles. The upper sur- 

 face has three curved carinae and a fourth carina occurs along the 

 outer lateral margin terminating in the above mentioned spine; the 

 propodus has the palm about as long as the merus, and the pointed 

 fingers almost as long as the palm; there are two longitudinal costae 

 on the upper margin, each terminating in a sharp spine, the upper one 

 of which is the larger. There is also a strong spine on the outer face 

 proximally, adjacent to the median angle of the carpus and just above 

 the third costa which terminates distally midway the base of the upper 

 finger; below this and parallel to it is the fourth costa which termi- 

 nates anteriorly between the bases of the fingers. A fifth costa ex- 

 tends along the lower margin, from near the base of the palm, to the 

 tip of the propodal finger; on the inner surface of the palm there is 

 a sixth carina, median in position. The fingers are tapered, slender, 

 meeting throughout their length, with a series of teeth consisting of 

 a large triangular tooth, flanked on either side by a similar small 

 tooth, there being four or five large teeth on each finger and twice 

 as many secondary teeth; the finger tips are curved, pointed, over- 

 lapping. These costae are all granulose. 



