360 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



Family CALAPPIDAE 



Subfamily GaLAPPINAE 



Genus GAL APPA Weber, 1795 



Galappa convexa Saussure 



Plate 62, Fig. 6 



Calappa convexa Saussure, Rev. Mag. Zool., ser. 2, vol. 5, p. 362 (9), 

 pi. 13, fig. 3, 1853. Rathbun, Zoologica, vol. 5, no. 14, p. 159, 1924; 

 Bull. 166, U.S. Nat. Mus., p. 206, pi. 62, figs. 1-3, and synonymy, 

 1937. 



Type locality. — Cape San Lucas, Lower California. 



Type. — Not extant. 



Range. — From Magdalena Bay, Lower California (Glassell), to 

 Salinas, Ecuador (Schmitt), Galapagos Islands (Williams Expedition). 



Atlantic analogue. — C. flammea (Herbst). 



Diagnosis. — Carapace broad, one and one-half times as wide as long, 

 rounded in front, surface low tuberculate, a series of transverse granlated 

 ridges arising from the posterolateral borders, Chelipeds closely approxi- 

 mating carapace ; hands with a high dentate crest. 



Material examined (2 specimens from as many stations). — 

 170-34. East of Wreck Bay, Chatham Island, 32 fms, Jan. 21, 1934, 



1 young (USNM No. 69334). 

 173-34. South Seymour Island, 5 fms, Jan. 22, 1934, 1 j^oung (photo- 

 graphed) (USNM No. 69758). 



Measurements. — ^Young specimen : length 7.0 mm, width 7.9 mm. 



Color in life. — Carapace hazel on frontal and gastric areas, an under- 

 tone of Eugenia red on branchial areas, and white across carapace at 

 cardiac level. A large Eugenia red patch on anterolateral area extending 

 over branchial area but almost covered with small patterns of ochraceous 

 orange and russet. Marginal teeth ochraceous orange. Eyestalks tawny; 

 eye pale blue. Chelipeds same as carapace with a large Eugenia red spot 

 across distal end of hand and base of movable finger. Fingers tawny olive 

 shading to very light tips. (Petersen) 



Habitat. — Sand. 



Depth.— 0-32 fms. 



Remarks. — C. convexa is the commonly encountered "Shame-faced 

 Crab" of the equatorial Pacific. It may be distinguished from the nearly 

 related C. saussurei Rathbun by the short, transverse, granulated ridges 

 on the posterolateral portions of the carapace, those of C. saussurei being 

 extended beyond the margin of the carapace onto the teeth at the postero- 

 lateral angles. It is also taken at shallower depths. 



