506 BULLETIN 129^ UNITED STATES NATIONAL MUSEUM i 



almost smooth. The largest nodule is the anterior branchial, which 

 is oblique, elongate and overhangs the lateral wall of the carapace. 

 Behind and below this lobe there is a short blunt spine or lobe at 

 the lateral angle of the carapace. The most prominent granules are 

 on the anterior portion of the carapace, namely, two on the summit 

 of each protogastric lobe, a row of three on each epigastric lobe, one 

 or two at base of each preorbital tooth. Two large tubercles on 

 intestinal region, from each of which a submarginal line of granules 

 extends outward. 



Rostrum short, deeply divided; horns broad, inner margin straight, 

 outer margin convex, sinus narrow. Preorbital lobe little advanced, 

 blunt, granulate; postorbital cup also little advanced. Basal antennal 

 segment broad, bearing two broad blunt lobes on the margin, each 



lobe outwardly arcuate, also a small suba- 

 cute tooth at the base of the next or 

 movable segment, and a tubercle on the 

 ventral surface near the postero-external 

 angle. 



Chelipeds of male very strong, one and 

 two-thirds times as long as carapace. Arm 

 tuberculate on upper margin and inner and 

 outer surfaces ; wrist nearly smooth ; palm 

 unusually high, its upper length about one 

 ^ ,,, ,^ and two-thirds times its height; immovable 



Fig. 145.— Microphrys Triangula- _ i 



Tus (21943), BASAL ANTENNAL ARTi- fluger » Httlc couvcx bclow, a large tooth 

 ^^^' ^ ^^ on the dactyl a little behind middle of gape. 



Merus joints of legs with about two rows of large tubercles some 

 of which are conical and subacute; a few of the same are on the 

 carpus, from one to three of these being enlarged; two tubercles on 

 each propodus. 



Color. — In spirits, uniform reddish (Lockington). 



Measurements. — Male (21943), entire length of carapace 15.4, 

 length of horns 1.2, width of carapace between tips of postero-lateral 

 tubercles or spines 14.3, length of cheliped 23.7, length of palm 

 along upper margin 7.9, greatest width of palm 4.9 mm. 



Variation and ajfinity. — ^A small male from the Galapagos has a 

 sharp spine at the postero-lateral angle of the carapace, while some 

 of the granules on the dorsal surface are sharper than usual. This 

 gives it somewhat the appearance of M. hrancldalis. Indeed there 

 is a curious resemblance between the two species. M. triangulatus 

 looks like a Irancliialis with the carapace shortened and widened, 

 especially the anterior portion, while the protuberances, which are of 



