THE SPIDER CRABS OF AMERICA 



537 



SOLENOLAMBRUS TYPICUS Stimpson 



Plates 192 and 193; plate 279, figs. 1-4 



Solenolambrus typicus Stimpson, Bull. Mus. Comp. ZooL, vol. 2, 1871, p. 133 

 (type-localities, off the Samboes and off Alligator Reef, 80 to 110 fathoms; 

 tj'pes not extant). — A. Milne Edwards, Crust. R6g. IMex., 1878, p. 159; 

 1879, pi. 28, figs. 4-4d.— Rathbun, Bull. U. S. Fish Comm., vol. 20, for 

 1900, pt. 2 (1901), p. 81 (part; not specimens from Porto Rico). 



Diagnosis. — Not more than four teeth on posterior and postero- 

 lateral margins. Two acute elevations on median line. An obtuse 

 angle at middle of branchial ridge. Thi-ee (or two and a half) rows 

 of moderate-sized tubercles on lower surface of palm and two rows 

 on outer surface; margins dentate. Cheli- 

 peds two and a half times as long as 

 carapace. 



Description. — Carapace one-ninth 

 broader than long. Surface coarsely 

 punctate. Protuberances of gastric and 

 cardiac regions triangularly p3Tamidal 

 and acute, with the ridges forming the 

 angles crenulated; the posterior ridge in 

 the median line of carapace, the other two 

 diverge from each other in front. Cardiac 

 pyramid symmetrical, each of its triangu- 

 lar sides being equal ; gastric protuberance 

 not symmetrical, the posterior ridge being 

 a short, steep slope, the two anterior ridges 

 being long and inclosing a gradual, some- 

 what convex, slope toward front. Ridge 

 of branchial region also crenulated and 

 bent at middle at an obtuse angle, almost 



a right angle. In the male each protuberance of carapace is sur- 

 mounted by an acute spine, while in the female the apical angles are 

 not thus acute. Margin of carapace more or less distinctly crenu- 

 lated, especially antero-lateral margin, at the outer or posterior end 

 of which are three small and not very well-marked teeth. Antero- 

 lateral margin concave anteriorly, convex posteriorly. Posterior 

 margin straight, lateral angles sharply defined and even dentiform or 

 spiniform. Eyes rather large, ^^■ith a minute tubercle on anterior side 

 of extremity. Basal joint of external antennae somewhat longer than 

 next joint. Epistome of moderate length. External maxillipeds 

 naked; ischium tuberculated near outer margin and near extremity. 

 Sternum with a few tubercles between bases of chelipeds. 



Chelipeds long, naked, except some inconspicuous setae on crest 

 of hand. Merus with denticulated margins and with surface above 

 for the most part smooth and glossy, but with a few tubercles near 



Fig. 148.— Solenolambrvs typicus 

 (50388), maxilliped, x 17.7 



