70 BULLETIN OF THE BUREAU OF FISHERIES. 



jaw, until the short medial series are neariy transverse to the jaw. In this species there are 7 series 

 in the mandible, a few of the lateral or posterior teeth in each series enlarged. 



Tubercles all small and inconspicuous, largely concealed beneath the thick interment, only the 

 rosettes of short spines a little protruding; no definite arrangement of plates is evident, nor are any 

 enlarged; this is true also of the interorbital region, where groups of short spines are scattered irregu- 

 larly; chin and throat and the caudal peduncle apparently smooth and naked. The lack of develop- 

 ment of the spinous tubercles can not be due to small size, for in the young of E. spinosus and E. orbis, 

 the plates are perfectly formed when much smaller than is the type of E. phrynoidcs. 



A single pore at the origin of the lateral line opening at the tip of a short tube; no other pores 

 present, but an irregular series of imperforate papillae follow approximately the course of the lateral line. 

 This is also the condition in E. spinosus and in E. orbis. A most careful examination of a large number 

 of specimens in perfect preservation has failed to demonstrate the existence of the full series of lateral 

 line pores which Collett ascribes to E. spinosus (Fishes Norwegian North Atlantic Expedition, p. 49). 

 Open pores are present on the head; one immediately behind the lower part of orbit, one beneath 

 the anterior part of orbit, and three pairs on mandible, the anterior pair well separated, at symphysis, 

 immediately behind lower lip. In E. spinosus and in E. orbis the mandibular pores open through 

 tubes, but in E. phrynoidcs no tubes are present. 



Origin of spinous dorsal over gill opening, the fin barely reaching base of second dorsal when 

 depressed; outline of fin angular, the spines gradually increasing in length to the fifth, the sixth and 

 seventh abruptly shortened; the spines are short, enveloped in thick membrane, with numerous soft 

 papillae, some of which may contain spinous points; second dorsal and anal with thin translucent 

 membrane, the last rays slightly overlapping base of caudal. Disk large, its middle under upper part 

 of base of pectoral. Vent a little nearer disk than anal fin. 



Color pale olive, lighter below, a few dark spots scattered over head and body. 



The species is not closely allied with any described form. E. brashnikoui Schmidt agrees in the 

 poor development of spinous tubercles, but is a compressed form of wholly different shape, with wide 

 lateral cleft to the mouth. 



Only the type taken. 



Lethotremus muticus Gilbert. 



Two young specimens from Petrel Bank, Bering Sea, station 4779; depth 54 fathoms. 



The species differs widely from L. aucB from Japan, in the broader snout and interorbital, the 

 larger eye, the wider transverse mouth with less lateral cleft, the longer fins, and the total absence of 

 filaments on the head. Lethotremus vinolentus Jordan and Starks, based on a specimen 13 mm. long 

 from Puget Sound, is the young of Eumicrotremus orbis, in which the larger spinous plates are already 

 in evidence. Owing to the very small size of the type of vinolentus, the fin rays were erroneously 

 given; there are at least g dorsal and 8 anal rays. L. muticus has a single pore in a tube at origin of 

 lateral line, but neither pores nor a series of papillae indicating the furtlier coinse of the line; three 

 pairs of mandibular pores without tubes, and one below and one behind eye are evident, and arranged 

 as in Eumicrotremus. As we are unable to demonstrate the presence of a lateral line in Eumicrotremus , 

 the only character remaining to distinguish Lethotremus is the total absence of spinous tubercles. 



Cyclopterichthys ventricosus (Pallas). 



Adults of this species in an injined and often dying condition were found in abundance in the tide 

 pools on Medni Island. Others were seen at Nikolski, on Bering Island, where groups of their eggs 

 were found fastened to kelp in the tide pools. 



CYCLOGASTERID^. 



Cyclogaster (Neoliparis) rutteri (Gilbert & Snyder). 



A single specimen was collected in the tide pools on Agattu Island. Length 2.5 inches. This 

 specimen appears to be a male, but differs from the description of the type in having the dorsal spines 

 low and botmd together with a thick skin. 



