FISHES FROM BERING SEA AND KAMCHATKA. 

 List of Stations. 



43 



THYRISCUS, new genus (Cottidae). 



Head and body rather deep, compressed; lateral line with a series of plates which have their upper 

 posterior border free and serrate; an axillary patch of spinous scales; skin otherwise smooth and naked. 

 Gill membranes broadly united, wholly free from the isthmus; a short slit behind last gill; top of head 

 without spines or tubercles; preopercle with 4 small simple acute spines. Teeth on jaws and on vomer 

 and palatines. Ventrals 1,3. 



Fig. 4. — Thyriscus anoplus, new species. TjTW. 



Nearest Icelus, but differing widely in the absence of the dorsal series of plates, the presence of a 

 slit behind the last gill-arch, and the greatly specialized lower pectoral rays. 

 Type Thyriscus anophis, new species. 



Tbyriscus anoplus, new species. (Fig. 4.) 



Type, a female, log mm. long, from station 4782, off Attu Island, Bering Sea; depth, 57 fathoms. 



Measurements in hundredths of length without caudal; Head 37; diameter of orbit 10.5; intcrorbital 

 width 2.3; snout 10.5; maxillary ig.5; width of head 17; depth at occiput 21; greatest depth 26; depth 

 of caudal peduncle 7 ; length of curved partof lateral line 39; of straight part (to base of caudal) 35; longest 

 dorsal spine 14; longest dorsal ray 19; length of caudal 24; length of upper part of pectoral 25; longest 

 pectoral ray 37; ventrals 19. 



Dorsal x-21; anal 17; pectorals 15. Plates along lateral line 42. 



Body compressed, especially along base of spinous dorsal; head deeper tlian wide; interorbital 

 space narrow, flat, with a low median ridge; occiput slightly concave but without distinct ridges or 

 tubercles; no spines or tubercles on supraocular rim; nasal spines small, slender, and pungent, a deep 

 cross-groove behind them; posterior nostril tube very low, anterior tube much longer. Mouth large, 

 horizontal, the maxillary broad, reaching vertical from posterior rim of orbit; lower jaw included, the 

 symphysis slightly produced; teeth minute, in broad bands on the jaws; vomer with an irregular single 

 series; palatine teeth in a short narrow lenticular patch. Preopercular spines very short, slender, acute, 



