460 BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



each hepatic, three on the branchial region, and four or five on each 

 lateral margin. The eyes extend beyond the margin of the orbits. 

 Rostrmn formed of very divergent horns; at their base a median 

 depression. 



Outer spine of basal article of antenna short and triangular; a very 

 small tooth below insertion of second article. (After Bell.) 



Color. — A rich, rather light, reddish brown (Bell) . 



Measurements. — Female, holotype, length linch (25.4 mm.) ; breadth 

 6 lines (about 15.2 mm.) (Bell). 



Range. — Known only from the Galapagos Islands; 6 fathoms. 



STENOCIONOPS MACDONALDI (Rathbun) 



Plate 268 



Lihinia macdonaldi Rathbun, Proc. U. S. Nat. Mus., vol. 15, 1892, p. 238, 

 pi. 29 (type-locality, Gulf of California, 71 fathoms; holotype male, Cat. 

 No. 16071, U. S. Nat. Mus.). 



Diagnosis. — Median spines of carapace 9; none on posterior margin. 

 Two large marginal hepatic spines. Rostrum about one-twelfth 

 length of carapace. 



Description of adult. — Shape much as in S. spinimana, the hepatic 

 region separately prominent, the after part of the carapace sub- 

 spherical. Hairy covering a very thick and dense pile. Spines con- 

 ical, blunt or subacute. Median spines 9 : 4 gastric, 1 genital, 2 car- 

 diac, 2 intestinal, none on posterior margin. Of the lateral spines, 2 

 are hepatic (exceptionally an additional spinule), the anterior the 

 smaller; 3 antero-lateral branchial spines, of which the middle one 

 is the largest; and 2 above postero-lateral margin, the last one of 

 which is the smaller and may be absent. From the first of these a 

 row of 6 low spines extends to the middle of the hepatic region. 

 Another small hepatic spine nearer the margins, sometimes absent. 

 Two large branchial spines, the hinder one in transverse line with 

 the anterior cardiac spine and with the spine at the postero-lateral 

 angle; a smaller, epibranchial spine; one or two small branchial 

 spines (in one case absent on one side) opposite the interval between 

 the 2 cardiac spines; a spine either side of the anterior gastric spine; 

 1 or 2 pairs of small spines between the orbits. A small subbranchial 

 spine invisible from above and a few pterygostomian spines. Rostral 

 horns short, triangular, outer margins slightly converging. Orbits 

 less open and with shorter spines than in spinimana. Basal antennal 

 article with two anterior spines; a spine near outer angle of buccal 

 cavity. 



Four spines and a few tubercles on upper margin of merus of 

 chehped; at subequal distances three other rows of tubercles. 



