68 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



the Rules in this case was considered, but action was withheld on the 

 advice of Waldo L. Schmitt, with Fenner A. Chace, Jr., concurring. 



Range: From Cedros Island, west coast of Lower California, and 

 Cape Tepoca, Gulf of California, Mexico, to Sechura Bay, Peru; 

 occurs also in the Atlantic from Marthas Vineyard, Massachusetts, to 

 Gulf of San Matias, Patagonia, with an interrupted range between 

 Martinique and Cape Frio, Brazil. Shallow water to a depth of 145 

 fathoms; in the Atlantic to 373 fathoms. The species from India 

 referred to this genus by Alcock (1895, p. 189) is doubtfully congeneric 

 with the American forms. 



Key to the Pacific American Species of Collodes 



la. Carapace with median spines, rostrum simple or bifid 

 2a. Rostrum bifid 



3a. Outer margin of basal antennal article denticulate . 



tenuirostris, young 



3b. Outer margin of basal antennal article granulate or 

 entire 



4a. Carapace coarsely granulate . . . granosus 

 4b. Carapace mostly smooth . . . robsonae 



2b. Rostrum simple tenuirostris, adult 



lb. Carapace without median spines, rostrum bifid 



5a. Carapace smooth except for four elevated tubercles forming 



a diamond near center tumidus 



5b. Carapace covered with pearly granules . . gibbosus 



Collodes gibbosus (Bell), new combination 

 Plate C, Figs. 1-7 ; Plate E, Fig. 1 ; Plate 3, Fig. 4 



Microrhynchus gibbosus Bell, 1835a, p. 88; 1836, p. 41, pi. 8, figs. 1, 



la-c. Miers, 1879c, p. 651. 

 Neorhynchus gibbosus A. Milne Edwards, 1879, p. 187. 

 Dasygyius gibbosus Rathbun, 1910, p. 571; 1925, p. 138, pi. 274, figs. 



1-4. Boone, 1927, p. 134, fig. 36. Garth, 1946, p. 375; 1948, p. 23. 

 Type: Male holotype, length 12.7 mm (not 15.2 mm if 1 line = 

 2.12 mm), width 10.6 mm, originally deposited in the Museum of the 

 Zoological Society of London, but no longer extant, as ascertained by 

 correspondence with the British Museum (Natural History). Female 

 neotype, U.S.N.M. No. 100921, from Salango Island, Ecuador, 12 

 fathoms, January 18, 1935, Velero HI station 396-35. 



