122 BULLETIN 129,, UNITED STATES NATIONAL MUSEUM 



COLLODES ARMATUS Rathbun 



Plate 217, fig. 6 



Collodes armatus Rathbun, Bull. Lab. Nat. Hist. State Univ. Iowa, vol. 4, 

 1898, p. 252, pi. 2, fig. 1 (type-locality, off Havana; holotype in Mus. 



S. U. I). 



Diagnosis. — Carapace smooth and unarmed above. Rostrum 

 short, subtruncate. Ambuhitory legs spinous beneath. 



Description. — Carapace narrow; dorsal surface smooth and shining, 

 nearly naked; cardiac, branchial and gastric regions much swollen; 

 hepatic region depressed and with one or more granules arid a spinule 

 on the margin; pterygostomian region with ten or more sharp spines. 

 Front subtruncate, margin slightly excavate, not advanced beyond 

 the antennular fossae, with a deep median sulcus terminating in the 

 interantennular partition which projects slightly forward as a median 

 tooth, not visible in dorsal view. Postorbital tooth triangular, 

 shorter than eyestalk. Abdomen of female with two median tubercles 

 on the coalesced segment; surface covered with curved hairs. Basal 

 antennal article with an acute tooth at antero-external angle; outer 

 margin with four irregular lobes; inner margin with a shallow sinus, 

 anterior angle rounded. Maxillipeds spinulous. 



Chelipeds of female slender, margins spinous, largest spines on 

 outer margin of merus and inner margin of carpus. Manus slender, 

 unarmed distally; fingers nearly as long as palm, in contact. Legs 

 long, slender, and of nearly equal length, margined with long, straight 

 bristles set in short, stout, cylindrical sockets, which remain as hard, 

 beadlike projections when the bristles are removed; a few curved 

 hairs present; the first two pairs of legs bear sharp spines underneath. 



Measurements. — Female, holotype, length of carapace 9, width 

 6.8 mm. 



Material examined. — The type female is the only specimen known; 

 it was taken in 1893 off Havana, Cuba, by the State University of 

 Iowa Expedition, and is deposited in the museum of that university. 



Genus BATRACHONOTUS Stimpson 



Batrachonotus Stimpson, Bull. Mus. Comp. Zool., vol. 2, 1871, p. 122; 

 type, B. fragosus Stimpson. — A. Milne Edwards, Crust. Reg. Mex., 

 1878, p. 180.— Rathbun, Bull. U. S. Fish Comm., vol. 20 for 1900, pt. 2 

 (1901), p. 56. 



Carapace triangular, broadly expanded behind, especially in male ; 

 surface rough with granulations; gastric, cardiac and branchial 

 regions strongly protuberant; hepatic region angular, approximating 

 the postorbital tooth; cervical depressions deep and broad, giving 

 carapace a superior outline much like that of a frog's back. Rostrum 

 very short, scarcely projecting beyond the walls of antennulary 

 fossae, slightly emarginated at the middle. Basal joint of antennae 



