190 



BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



ambulatory legs, of which the first is longer than the rest, have 

 strongly recurved dactyli. Abdomen of seven separate segments in 

 both sexes. 



Off Porto Rico; Zanzibar; Karachi, India. 



MENAETHIOPS PORTORICENSIS Rathbun 



Plate 49, figs. 1 and 2 

 Menaethiops portoricensis Rathbun, Proc. U. S. Nat. Mus., voL 64, art. 

 14, 1924, p. 2 (type-locality, Porto Rico; 13^ miles S. of Cana Gorda 

 Islands, near Guanica Harbor; 26 fathoms; female, holotype, F 2628, 

 Amer. Mus. Nat. Hist.). 



Diagnosis. — Rostrum nearly half as long as remainder of cara- 

 pace, its spines widely divergent. Two marginal, hepatic spines. 



Description. — Surface of carapace and 

 appendages in large part covered with 

 broad, flattened vesicles the largest of which 

 are spatuliform. These are so varied in 

 size, shape, and disposition that at 

 first sight they appear like foreign bodies. 

 Carapace constricted behind orbit and be- 

 hind hepatic regions. Gastric, cardiac, and 

 intestinal regions tumid, and tuberculate or 

 granulate; four tubercles form a transverse 

 diamond on the gastric region. Rostrum 

 slender, divided in its middle into two 

 widely divergent, slightly curved and tap- 

 FiG. 76.-MENAETHIOPS poRTORi- ^ring homs ; basal half of rostrum with a 

 cENsis, MALE (56012), ENDOPODiTE mediau furrow. Preocular spine suberect, 



OF MAXILLIPED, X 43.8 . , ,, ,. ,. , 



promment; nearer the median Ime may be 

 seen a smaller spine of the basal antennal article. On the lateral 

 margin of the hepatic region there are two slender spines; on the 

 branchial region near its anterior end and a little above the margin 

 there is a small, acute 

 spine, while near the lat- 

 eral angle of the carapace 

 is the largest spine of all. 

 The ornamentation of the 

 carapace is considerably 

 obscured by the vesicular 



pubescence. rSesides a pj^ 77.— menaethiops portoricensis, male (50012), chela, 

 long, slender, cylindrical m"^"™ enlarged 



spine at the antero-external angle of the basal antennal article, 

 there is a tubercle on its outer margin. Two pterygostomian tubercles. 

 Chelipeds of male stout; fingers widely gaping in their basal half, 

 the fingers being arched away from each other; prehensile edges 

 broad and thin; a large tooth near base of dactyl. Legs highly 



