474 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



Heterocrypta macrobrachia Stimpson 

 Plate Z 4 , Figs. 16, 16a; Plate 55, Fig. 1 



Heterocrypta macrobrachia Stimpson, 1871a, p. 103. A. Milne Edwards, 



1878, p. 167, pi. 29, fig. 3-3b. Rathbun, 1898, p. 581; 1910a, p. 



576; 1923b, p. 633; 1925, p. 558, pi. 203, figs. 3, 4; pi. 282, figs. 



4, 5. Garth, 1948, p. 33. 



Type: Male holotype, length 14.2 mm, width 15.2 mm, merus of 



cheliped 11.7 mm, hand 14.0 mm; not extant. 



Type locality: Panama, Captain J. M. Dow, collector. 



Localities subsequently reported, with collectors: Lower California, 

 Mexico: Magdalena Bay, 12 and 51 fathoms, Albatross (Rathbun, 

 1898), 13.5 fathoms, Albatross (Rathbun, 1923b). Mexico (A. Milne 

 Edwards). Ecuador: off Cape Pasado, 18 m, Askoy (Garth). 



Atlantic analogue: Heterocrypta lapidea Rathbun. 



Diagnosis: Branchial ridges subparallel to anterolateral margins; a 

 deep concavity on posterolateral margin between branchial ridge and 

 lateral angle. Gastric summit marked by a horizontal continuation of 

 the branchial ridges. Fingers not bent at an angle to hand. Male first 

 pleopod stout, cylindrical, regularly tapering to contorted, subacute tip ; 

 a few setae on lip of groove, a larger number on groove margin nearer 

 extremity; longer setae subterminally. Male second pleopod of length 

 equal to first, straight, corneous tip elongated, channeled, a subterminal 

 transverse row of denticles. 



Description: Body depressed. Carapace narrower and less triangular 

 than that of Heterocrypta granulata, but resembling it in its granulated 

 ridges and protuberances. Anterolateral margin regularly convex, and 

 crenulated with fourteen or fifteen teeth, themselves denticulated. Margin 

 between the lateral angle of the carapace and the projecting terminus of 

 the branchial ridge profoundly concave. Posterior margins crenulated 

 like the anterior, with a somewhat larger tooth on each side at the 

 juncture of the posterior with the posterolateral margins. Exognath of 

 the external maxillipeds not tuberculated. 



Chelipeds very long, smooth, and naked above, except at crenulated 

 edges. Ambulatory [legs] compressed; merus with sharp, minutely den- 

 ticulated lower edge. (Stimpson) 



A blunt downward-pointing spine on sixth segment of male abdomen. 

 (Rathbun) 



Material examined: 132 specimens from 34 stations. (See Table 

 105) From Santa Maria Bay, west coast of Lower California, and 



