470 



THE FUR SEALS OF THE PRIBILOF ISLANDS. 



whitish patches; five black spots on lower jaw; top of head blackish; a narrow blotch 

 at shoulder; a wider one across first dorsal; a broad one on second dorsal abruptly 

 broadened on body, then narrowed extending across anal; an irregular bar at base of 

 caudal; a narrow bar and some spots and streaks on the fin; pectoral with two 

 curved bars, the inner concave, the outer convex backward, the two inclosing a 

 rounded pinkish area. 



One specimen 50 mm. long from station 3G40 off St. Paul Island; depth, 26 

 fathoms. The species is abundant IVoin Puget Sound through Bering Sea to the 

 Kuril Islands. The present collection contains a specimen 16 mm. long from station 

 3653 ott' Iturup Island ; depth, IS fathoms. The species was also taken at station 3674, 

 off Karluk. In these specimens the coloration is variable, the bands on the back 

 being sometimes divided. The pectoral fins are orange at base in life, the color vary- 

 ing to blight yellow. 



Family AGONID^e. 

 119. Occa dodecaedron (Tilosins). 



Two specimens from Shana Bay, Itnrnp Island. 



Ocra diiderai'ilrmi. Sliaiia Hay. Ituni)i Islaiiil. Anna I., llrown del. 



Becorded by Dr. Gilbert from 

 Bristol Bay. These agree 

 very closely in details of form, 

 structure, and coloration with 

 material from eastern Bering 

 Sea and seem to differ only 

 in the longer, sharper s])ines 

 with which the plates of the 

 dorsal series are provided. 

 The ridges on tlie top of the 

 head are also narrower and 

 sharper. This may indicate 

 specific or subspecific se])ara- 

 tion, but, our material is 

 insufficient to indicate that 



such is the case. From Cnvier's description, based on an individual sent him by 

 Tilesius, our s])ecimens differ in the coloration of the caudal fin, the longer head, and 

 the shorter snout and eye. The caudal is nearly uniformly blackish, not spotted with 

 brown like the ]>ectorals. The head is contained 4=| times in total length (not 6 times), 

 and the eye and snout are about one-fifth length of head (not one-fourth). 



The species is closely allied to (). rcrrncosa, but differs conspicuously in coloration 

 and ill numerous structural details. The cheeks are naked below the stay, tlie stay 

 is without spine, the medial portion of gill membranes are plated, and the invest- 

 ment of the breast is very different. Comjjare in this respect the accompanying 

 figure with Steiudachner's plate of Afjoniis bnrkani (= O. verrucosa) in Ichthy. 

 Beitriige IX, taf. V. Fin rays in our specimens: D., X, 8; A., 14; P., 14 or 15. The 

 two species verrucosus and dodecaedron form a minor group or genus, distinguished 

 from Brachyopsis {rostratus) by the short snout, which is not produced and Synijnathus. 

 like. Siphaffonus Steindachner is identical with Brochyopsis. For the gronj) typified 

 by verrucosus: and dodecaedron Jordan and Evermann have taken the name Occa 

 (meaniug a harrow). 



