220 BULLETIN 128^ UNITED STATES NATIONAL MUSEUM 



ROCHINIA OCCIDENTALIS (Faxon) 



Plate 228; plate 229, fig. 5. 



Anamathia occidentalis Faxon, Bull. Mus. Comp. Zool., vol. 24, 1893, p. 

 150 (type-locality, near the Galapagos Islands, 385 fathoms, holotype, 

 Cat. No. 4479, M. C. Z.); Mem. Mus. Comp. Zool., vol. 18, 1895, p. 8, 

 pi. 1, figs. 2 and 2a. 



Diagnosis. — Median spines and tubercles 4; gastric spines and 

 tubercles 4; 14 dorsal spines and tubercles; marginal spines and 

 rostral horns of moderate length; a small spine or tooth on basal 

 antennal article; none at buccal angle; a tubercle at end of merus 

 of all legs. 



Description. — Carapace strongly arched, clothed with tuberculi- 

 f orm, cutaneous vesicles and with delicate setae hooked at their tips ; 

 and furnished with spines and tubercles arranged as follows: Four 

 on the gastric region (two in the median line, two lateral), the 

 posterior of the median ones having the form of a tubercle, from 

 which a low blunt keel runs back to the cardiac region; one on the 

 cardiac region, one (tubercle) on the intestinal region, one (a marginal 

 spine) on each hepatic region, five on each branchial region. Of the 

 branchial spines the one at the widest part projects upward and 

 forward, and is the longest spine of the carapace, one-half as long as 

 the rostral horns. There are four or five small tubercles on the 

 outer border of the pterygostomian region. Rostrum more than 

 one-fourth the length of the carapace and with 2 slightly divergent 

 awl-shaped horns. Preocular spine well-developed and acute. 

 Basal antennal article with a short, blunt spine or tubercle at its 

 antero-external angle. Buccal area with its antero-external angle 

 projecting but not dentiform. 



Chelipeds of male twice as long as carapace, not much more robust 

 than the ambulatory legs; propodus little longer than the merus, 

 subcylindrical, widening toward the fingers. Fingers less than half 

 the basal portion ; prehensile edges regularly dentate, closing through- 

 out their length. Merus of ambulatory legs with a small tubercular 

 projection at the distal end above, most prominent in the anterior 

 pair. 



Measurements. — Male holotype, length of carapace without rostral 

 horns 45, length of rostral horns 12, width of carapace 38, length of 

 longest branchial spine 7 mm. 



Range. — Galapagos Islands. Known only from type-specimen. 



Material examined. — Oft' the Galapagos Islands; lat. 1° 03' 00" 

 S.; long. 89° 28' 00" W.; 385 fathoms; R.; temp. 43.2° F.; March 

 28, 1891; station 3404; 1 male, holotype (4404, M. C. Z.). 



