PART 1 GARTH : PACIFIC OXYRHYNCHA 479 



Heterocrypta colombiana Garth 

 Plate Z 1( Figs. 13, 13a; Plate 54, Fig. 3 



Heterocrypta colombiana Garth, 1940, p. 71, pi. 18, figs. 1, 2; 1948, 

 p. 23. 



Type: Male holotype, U.S.N.M. No. 78778, length 4.9 mm, width 

 7.0 mm, length of hand 4.5 mm. 



Type locality : Port Utria, Choco, Colombia ; Velero III. 



Localities subsequently reported, with collectors: Costa Rica: Salinas 

 Bay, 1.5 fathoms, Velero III (Garth, 1940). Ecuador: off Esmeraldas, 

 9-27 m, Askoy (Garth, 1948). 



Atlantic analogue: Heterocrypta granulata (Gibbes). 



Diagnosis: Rostrum prominent, trilobate. Branchial ridges parallel 

 to anterolateral margins but straighter; no concavity on posterolateral 

 margins between branchial ridge and lateral angle; posterior margin 

 straight. Chelipeds massive ; major manus half as high as wide, fingers 

 closing with a gape. Male first pleopod cylindrical, tapering in basal 

 three-fifths, a row of setae on lip of groove, other long setae in rows on 

 outer two-fifths and in clusters about emarginate tip. Male second pleo- 

 pod little more than half as long as first, straight, a short corneous tip 

 with basal denticles. 



Description: Carapace depressed, width nearly one and one-half 

 times length, smooth and microscopically punctate. Branchial ridges 

 consisting of a double row of bead granules parallel to denticulate antero- 

 lateral margins but straighter. A short, transverse gastric ridge joining 

 branchial ridges ; carapace highest at this point. Cardiac region low, non- 

 granulate, but punctate. Posterior margin almost straight, a pronounced 

 angle at its lateral extensions beyond the branchial ridges. Rostrum 

 broadly elongate, margin granulate, faintly trilobate. Orbit with a closed 

 fissure above. 



External maxilliped granulate, merus notched at inner angle for 

 insertion of palpus and produced at external angle to form a concave arc 

 with outer border of ischium. A granular ridge running from angle of 

 buccal cavity to base of cheliped. 



Chelipeds short, heavy, and strikingly disproportionate; merus of 

 each widest at mid-point, with two serrate denticles on inner margin 

 and a row of bead tubercles lengthwise on inferior surface; carpus of 

 each with inferior granular ridge continued and three additional lines of 

 granules on superior surface; manus of large claw with a high superior 

 crest faintly angled at mid-point, a more sharply angled median crest on 



