74 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



A secondary breakdown shows sand present with the mud more often 

 than not, and shell present with rock in two of three instances. Askoy 

 specimens were from mud and live shell bottom (Garth, 1948). 



Depth : 2-30 fathoms. 



Breeding: Ovigerous females were encountered in the Gulf of 

 California in March and April, off Guatemala in March, and off 

 Ecuador in January and February. Nine of twelve females recovered 

 from Ecuadorean waters were gravid, indicating a cycle culminating in 

 late Southern Hemisphere summer. 



Size and sex: The largest specimen previously known was the 9.7 

 mm female recorded by Rathbun (1925). Males from the lot from 

 which the neotype was taken measured from 9.3 to 11.8 mm, females 

 (all ovigerous), from 7.4 to 9.9 mm. 



Remarks: The synonymy of Collodes Stimpson and Dasygyius 

 Rathbun, here proposed, depends on evidence earlier developed that 

 Collodes granosus, type species of the former, is congeneric with 

 Dasygyius gibbosus, rediscovered type species of the latter genus, for 

 which a neotype has been proposed. Since Collodes granosus is likewise 

 without surviving type specimen material, and is involved in the re- 

 solution of the same taxonomic problem, it appears consistent with the 

 provisions of the Copenhagen Decisions on Zoological Nomenclature 

 (1953, p. 28, par. 34) that a neotype should be established for that 

 species also. Fortunately, there is available for this purpose in the 

 Hancock collections a female from the type locality, Cape San Lucas 

 {Velero IV station 1724-49), that agrees in all particulars with the 

 original description above. It is accordingly designated the neotype of 

 Collodes granosus Stimpson. 



Collodes tenuirostris Rathbun 

 Plate E, Fig. 3 ; Plate 6, Fig. 5 



Collodes tenuirostris Rathbun, 1893b, p. 230; 1898, p. 569; 1925, p. 



113, pi. 37, text-fig. 35. Crane, 1937, p. 55. 

 Collodes, doubtful species, Rathbun, 1894, p. 53. 



Type: Male holotype, U.S.N.M. No. 17333, length 11.5 mm, 

 width 8 mm. 



Type locality: Gulf of California, Mexico, Lat. 30° 16' N, Long. 

 113° 05' W, 36 fathoms, Albatross station 3018. [Off Cape Tepoca] 



Localities subsequently reported, with collectors: Mexico: west coast 

 of Lower California: off Abreojos Point, 48 fathoms, and Magdalena 



