FISHES FROM BERING SEA AND KAMCHATKA. 



39 



The intromittent organ in the male is slender, gently tapering, and ending in a slender curved 

 point. In typical Icelus (bicornis and spiniger) the intromittent organ becomes widened and biiobed 

 distally, and the short terminal cirrus springs from the dorsal side. 



Icelus spiniger Gilbert. 



List of Stations. 



These localities are from Petrel Bank, Bering Sea, to the extensive plateau from which arise the 

 Commander Islands. 



The following table exhibits range of variation in fin rays in 25 specimens from all the above 

 localities: 



Icelus uncinalis, new species. (Fig. 2 and 2a.) 



Type, a male, 97 mm. long, from station 4784, near Attu Island; depth, 135 fathoms. 



Measurements in himdredths of length without caudal: Head 38; snout 11. 5; orbit 11. 8; interor- 

 bital width 2.2; width of head 19; depth at occiput 24; maxillary 18; greatest depth 26; depth of 

 caudal peduncle 5; longest dorsal spine 14; longest dorsal ray 15; caudal 22; pectoral 32; ventral 18; 

 anal papilla 13. 



Dorsal ix-ig; anal 16; pectoral 18. 41 plates in the lateral line; 35 plates in the dorsal series. 



The following table gives range in fin rays among the 12 specimens of uncinalis which were 

 obtained : 



Head and body robust, compressed, cheeks vertical; interorbital width less than diameter of pupil, 

 shallowly concave; occiput depressed well below the raised interocular region, bounded on each side 

 by a low ridge which bears 2 tubercles, each terminating in a short sharp spine; nasal spines short and 

 sharp; numerous minute scattered pores on top and sides of head; a pair of supraocular tentacles widen- 

 ing upward from a narrow base, the margin multifid; nasal tubes short, the anterior the longer; 

 mouth large, slightly oblique, the mandible included, the maxillary reaching vertical a little behind 

 middle of pupil; teeth minutely villiform, in broad bands in jaws and narrower patches on vomer and 

 palatines; gill membranes wholly free; no pore or slit behind last gill arch. 



