56 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



(1) The pearly granules covering carapace, chelipeds, sternum, 

 and abdomen in ornata and conspicuous to the naked eye are 

 wanting in angelica except on the merus of the cheliped. 



(2) The angle which the more advanced front makes with the 

 hepatic margin in angelica is more pronounced than in ornata, 

 the frontal teeth are more prominent, and the intervening 

 sulcus is deeper. 



(3) The granules on the external maxilliped tend to disappear 

 toward the base of the ischium in angelica, although persisting 

 in ornata. 



(4) The lower margin of the merus of the fourth walking leg, 

 denticulate in ornata, is smooth and bare in angelica. 



The species is named for one of the two island guardians of the Gulf's 

 solitude, the Island of the Guardian Angel (Angel de la Guardia) and 

 the Island of the Holy Spirit (Espiritu Santo). 



CALAPPIDAE 



Genus OSACHILA Stimpson 



Osachila sona, new species 

 Plate 12, Figs. 1-4 



Type: Female, holotype, Cat. No. 387, Allan Hancock Founda- 

 tion, The University of Southern California, and male, allotype, from 

 Bahia Honda, Panama, 30-50 fathoms; March 1, 1938; four young 

 specimens, paratypes, sex undetermined, same locality and date; col- 

 lected by Allan Hancock Expedition of 1938 at Velero Station 863-38. 

 Two males and one young female, paratypes, from outside Medidor 

 Island, Bahia Honda, Panama, 30-35 fathoms; March 28, 1939; col- 

 lected by Allan Hancock Expedition of 1939 at Velero Station 948-39. 



Measurements: Female holotype: length of carapace 20.0 mm., 

 width 25.5 mm., width of front 6.0 mm., length of chela 9.5 mm., of 

 dactyl 6.0 mm. Male allotype: length of carapace 14.0 mm., width 

 17.3 mm. 



Diagnosis: Branchial elevations rounded, extensive, inside of each 

 a small, triangular elevation. Front little advanced, lobes broad. Pos- 

 terior portion of carapace and ambulatory legs roughly granular. Ster- 

 num and abdomen with raised, berried tubercles. Dactyls with paired 

 laminae. 



