474 THE FUR SEALS OF THE PRIBILOP ISLANDS. 



groove; a similar groove behind occipital spines; area between occipital and temporal 

 ridges also deeply concave; a strong opercular ridge. 



All the plates with strong spines, including those of the ventral series; the 

 weakest spines are on the anterior plates of the lateral series ; plates on breast with 

 central spine and radiating ridges; dorsal series with fewer plates than in other 

 species ; 3 in front of spinous dorsal, 11 (or 12) along base of spinous dorsal, 2 (or 1) 

 between dorsals, G at base of soft dorsal, 14 (or 13) unpaired plates on back of caudal 

 peduncle. The unpaired plates have the spine notched at tip. All the plates are 

 marked with strong radiating ridges and have the surface of the spines minutely 

 roughened. 



Color, light gray above, white below; top and sides of head with black dots and 

 dashes ; back crossed by six narrow black bars. Distinguished from all other species 

 of the genus by the great development of the lateral ridge and spines on head. This 

 gives the head and especially the snout a much broader outline, approaching in this 

 respect Agonux cataphr actus. The species is represented by several young specimens 

 in rather poor condition, the type being 53 mm. long. The outline and armature of 

 the head are not, however, essentially different in young and adults of such species 

 as are known to us from specimens of different sizes. Off Shana Bay, Iturup Island, 

 Kuril group. (This species is named in honor of Prof. D'Arcy Wentworth Thompson, 

 of the University of Dundee, the commissioner of Great Britain in the fur-seal 

 investigations in Bering Sea in 1896 and 1897.) 



125. Podothecus veternus Jordan and Starks. 

 Described from Eobben Island. 



126. Podothecus accipiter Jordan and Starks. 

 Described from Eobben Island. 



127. Podothecus acipenserinus (Tilesins). 



One specimen of this abundant species was taken from the stomach of a codfish 

 at St. Paul Island. It is recorded by Dr. Bean from Kadiak, TJnalaska, and Port 

 Clarence, and was found by Stejneger on Bering and Copper islands. 



128. Podothecus gilbert! (Collett). 

 Described from Petropaulski. 



129. Sarritor frenatus (Gilbert). 



One specimen from station 3643 extends the range of this species to the Kam- 

 chatka coast (off" Povorotnaya, in 100 fathoms). Anomalous arrangement is shown in 

 the predorsal plates, most of which occur alternately instead of in pairs. The inter- 

 space separating the dorsals is longer than in any other siiecimen we have seen, 

 extending over five pairs of plates. The interspace extends usually over but two or 

 three pairs of plates, four pairs being included in but one of our specimens from 

 eastern Bering Sea. No further differences could be detected. The original localities 

 of this species are about Pnalaska and Unimak. 



130. Sarritor leptorhynchus (Gilbert). 



Described from various stations north and south of the peninsula of Alaska. 



131. Xenochirus alascanus Gilbert. 



Dredged by us off' Karluk: recorded by Dr. Gilbert from many localities about 

 Unimak Pass. 



