470 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



Habitat. — Rocky shore. 



Depth. — Shore; occasionally to 32 fms. 



Remarks. — This series is remarkable for the small size of the ovig- 

 erous females as compared to the adult males. Females less than 6 mm 

 long were found with the full complement of eggs. The conspicuous 

 extension of the black on the fingers backwards on the palm, given by 

 Boone (1927) as diagnostic of Xanthias insculpta, appears from Hancock 

 series to occur only in large males. In females and smaller males it is 

 chopped off abruptly at the base of the fingers or extends but slightly on 

 the palm. A large male examined by the writer checks exactly with the 

 proportions given for the type of X. insculpta. 



The young of this species is difficult to distinguish from the young of 

 Xanthodius stimpsoni (A. Milne Edwards), of the mainland coast; in 

 fact, one Galapagos specimen so labeled was found in the collections of 

 the U.S. National Museum. Since it is altogether possible that X. 

 stimpsoni may occur in the Galapagos area, future collectors should ex- 

 amine with particular care their series of P. insculptus. 



Genus MENIPPE de Haan, 1833 



Menippe obtusa Stimpson 



Plate 82, Figs. 3, 4 



Menippe obtusa Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, p. 

 53 (7), 1860. Rathbun, Bull. 152, U.S. Nat. Mus., p. 478, pi. 197; 

 pi. 198, f^gs. 1 and 2, 1930. Sivertsen, Med. fra det Zool. Mus., 

 Oslo, nr. 38, p. 16, 1933. 

 Type locality. — Panama. 

 Type.—\]^nM No. 2050. 



Range. — Pacific side of Costa Rica and Panama (Sternbergh) ; 

 Floreana (Charles) Island, Galapagos (Sivertsen). 



Diagnosis. — Anterolateral borders strongly arched; 5 broad teeth, 

 including orbital ; second tooth bilobate. Chelipeds massive, a stridulating 

 ridge on inner surface of chela. But one lobule on frontal margin adjoin- 

 ing each submedian lobe. 



Material examined (19 specimens from 8 stations). — 

 30-33. Gardner Bay, Hood Island, shore, Jan. 26, 1933, 4 females. 

 38-33. SE of Cormorant Point, Charles Island, shore, Jan. 29, 1933, 



2 males, 1 female. 

 71-33. James Bay, James Island, shore, Feb. 12, 1933, 4 females, 

 73-33. Cartago Bay, Albemarle Island, shore, Feb. 13, 1933, 1 male. 

 166-34. Black Beach, Charles Island, shore, Jan. 19, 1934, 1 female. 

 174-34. South Seymour Island, shore, Jan. 22, 1934, 2 females. 



