DECAPODS 147 



Distribution. San Francisco Bay, California, to Panama ; Galapagos 

 Islands. To a depth of 5 1 y z fathoms. 



Taken by the Albatross at the following localities : Magdalena Bay, 

 Lower California; off Santa Margarita Island, Lower California, 47 

 fathoms, station 3039 ; Gulf of California, 9^-33 fathoms, stations 2823, 

 3013, 3022, 3025, 3031, 3037; also at Guaymas; Concepcion Bay, 

 mouth of Rio Mulege; Algodones Lagoon; and La Paz Harbor. 

 Panama; Panama Bay, 29^-51^ fathoms, stations 2795, 2799, 2804, 

 2805. 



Genus Benthesicymus Bate. 



BENTHESICYMUS TANNERI Faxon. 



Benthesicymus tanneri FAXON, Bull. Mus. Comp. Zool., XXIV, 215, 1893; 

 Mem. Mus. Comp. Zool., xvm, 205, pi. H, 1895. 



Distribution. From off San Diego, California, to Ecuador; Galapagos 

 Islands. 331-1322 fathoms. 



The Albatross has collected this species at the following localities, 

 besides those cited by Faxon : 



Off San Diego, 822 and 623 fathoms, stations 2923, 2929. 

 Gulf of California, 857 and 1005 fathoms, stations 3009, 3010. 

 Off Cape San Francisco, Ecuador, 401 and 741 fathoms, stations 2792, 



2 793- 

 Galapagos Islands, 634 and 392 fathoms, stations 2808, 2818. 



Genus Gennadas Bate. 

 GENNADAS BOREALIS Rathbun. 

 Gennadas borealis RATHBUN, Proc. U. S. Nat. Mus., xxiv, 887, 1902. 



Submembranous, glabrous. Rostrum reaching at least half-way along 

 the eye-stalk, sometimes to the cornea, armed with a single tooth, carina 

 very distinct nearly to the 

 posterior border of the cara- 

 pace, but sharpest in front of 

 the cervical groove. There 

 is a sharp marginal spine at 

 the angle of the antero- 

 lateral sinus. 



Eyes light brown, globu- 



. , . , , , , FlG. 88. Gennadas borealis. 9 . Station 3783. a. Side 



lar, having & Speck Of black view of carapace <X 2). t. Thelycum (X 5)- 



pigment near their base on the outer margin of the stalk ; tubercle large 

 and acute. Antennular flagella broken, the upper one thick at base. 

 The antennal scale extends beyond the antennular peduncle by about the 

 length of the last segment of the peduncle. Antennal flagellum as long 



