68 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



Galapagos, shore; January 21, 1938; collected by Allan Hancock Expe- 

 dition of 1938 at Station 796-38. Female, paratype, ovigerous, Cat. No. 

 3811a, Allan Hancock Foundation, collected at same place and time. 

 The remaining paratypes are considered under the heading Material 

 examined. 



Measurements: Male holotype: length of carapace 31 mm., width 

 47 mm., length of merus (major cheliped) 29 mm., carpus 13 mm., 

 manus including pollex 46 mm., width at base of dactyl 20 mm., height 

 of sternal pit 3.8 mm., breadth 5 mm. Female paratype: length of cara- 

 pace 30 mm., width 45 mm., length of merus (major cheliped) 23 mm., 

 carpus 12.0 mm., manus including pollex 27 mm., width at base of 

 dactyl 16.5 mm. 



Diagnosis: Carapace subtriangular, lateral regions deeply eroded and 

 spined on the anterolateral and posterolateral margins. Posterolateral 

 and posterior margin nearly a straight line. Basal antennal article almost 

 reaches the orbital hiatus. Sternal pit semiovoid. Chelipeds heavy, short, 

 unequal. Meri of ambulatoiy legs one and one-half times as long as 

 wide, with teeth of upper crest having a tendency to overlap, leaving 

 interstices between; propodi about as wide as long with two teeth on 

 lower margin; dactyli longer than their propodi, granulated except for 

 corneous tip. 



Description: Carapace subtriangular, about five eighths as long as 

 wide, rostrum bluntly rounded and deflexed. Protogastric regions high, 

 with a median eroded sulcus, mesogastric region less in height, semi- 

 conical posteriorly, and margined posteriorly with a wide deep pit on 

 each side. The ridge joining the frontal regions with the branchials has 

 two closed sutures. Cardiac region depressed, outlined with erosions and 

 mushroomlike tubercles. Outer and submarginal posterior border eroded, 

 with an eroded, depressed tooth on each side of the first abdominal seg- 

 ment. The hepatic region is obliquely vertical, projecting downward in 

 a broadly triangular lobe. Anterolateral margin bordered with eleven or 

 twelve granulated, serrate-edged teeth, each with a median ridge, those 

 on the posterior half the largest. The posterolateral margins are tangent 

 to the anterolateral, with teeth similar to those of the latter except that 

 the edges are interlaced and coalesced forming a subentire line. 



The chelipeds are about twice the length of the carapace; merus 

 roughly trigonous, three quarters the length of the carapace, depressed 

 on upper surface which is punctate and lobed, the inner margin with 

 three or four granulate lobes, the outer proximal margin with three or 



