233 



Key to the Imllnii species of Paralomis. 



I. Carapneo very closely covered with small tubercles which are all of one 

 size and are all crowned with short stiff setre. Rostrum trifid with 

 the sides and dorsum spiny ... ... ... ... P. investigatoris. 



II. Carapace covered with noti-setose tubercles of several sizes. Rostrum 



trifid with a pair of denticles nt base ... ... ... P. indica. 



12. Paralomis investigatoris, Alcock & Anderson. 



Paralomis investiyatoris, Alcock and Anderson, Ann. Mag. Nat. Hist., Jan, 1899, p. 17. 

 ILLUSTRATIONS OF THE ZOOLOGY OF THE INVESTIGATOR, CRUSTACEA, PLATE XLIII. FIG. 1. 



This appears to be most nearly related to the Paralomis aspera of Faxon, 

 from off the Pacific coast of Panama. 



Carapace piriform, convex, slightly longer than broad ; gastric, cardiac, and 

 branchial regions well defined, tumid ; the entire surface of the carapace, as of 

 the second abdominal segment, is closely covered with equal-sized papilliform 

 tubercles, each of which is encircled by a crown of small stiff hairs. 



Rostrum very distinctly and evenly trifid, the middle spine with a few 

 minute denticles at the proximal end of its ventral border ; its sides and dorsal 

 surface are spinate. 



Lateral margins of carapace, from the spiniform orbital angle to the middle 

 of the branchial regions, armed with sharp curved spines. 



Bye-stalks dorsally spinulose. Antennulary peduncle smooth. Antennal 

 peduncle with the first two joints spiniform at the outer angle and the third 

 joint spiniform at the inner angle, the flagellum longer than the carapace. 



The movable antennal acicle reaches nearly to the end of the peduncle and 

 ends very acutely ; its outer edge bears at least three large spines and its inner 

 edge three small spines. 



Chelipeds and legs thickly spiny, especially on the dorsal surfaces. The 

 right cheliped is very slightly stouter than the left, which is not stouter than the 

 legs ; but the right legs are not longer than the left. The legs all end in a little 

 black claw and are hardly half a [dactyhis longer than the chelipeds ; they are 

 about lg times the length of the carapace. 



The second abdominal segment bears a single dorsal plate, which is rather 

 deeply dimpled on either side of the middle line. 



The abdomen of the male is quite straight and practically symmetrical ; in 

 the female it is not quite symmetrical and is slightly twisted to the right. 



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