156 PROCEEDINGS OF THE NATIONAL MUSEUM. 



SQUALOGADUS, new genus. 



This remarkable genus is an ally of M acrouroides Smith and Kad- 

 cliffe/ and together with it forms the subfamily Macrouroidinae 

 (=Macrouroididae Smith and Radcliffe), a group which resembles 

 the Bathygadinae closely in the following characters : The free gill 

 arches, the first not being united to the wall of the pharyngeal cavity 

 by a membrane; the slender, numerous gill-rakers; the pseudobran- 

 chial filaments, located beside a conic pit; the forward and ventral 

 extension of the gill openings ; the dorsal better developed than the 

 anal; the second dorsal ray not a modified spine; and the seven 

 branchiostegal rays correlated with the position of the anus immedi- 

 ately before the anal fin. The Macrouroidinae resemble the Cory- 

 phaenoidinae and differ from the Bathygadinae in the rough scales 

 and the spmous uppermost pectoral ray. The many peculiar charac- 

 ters of the Macrouroidinae are listed in the Key to the Subfamilies 

 and Genera. 



Squalogadus differs from Macrouroides in the presence of ventral 

 fins ; in the wide pectorals, with 25 rays ; in the long gill-rakers ; in 

 the presence of pseudobranchial filaments ; and in the more posterior 

 mouth, which is wholly behind the eye. 



Generic description. — Head extremely massive, ellipsoidal, and 

 covered with a lax skin, and everywhere rounded in outline, without 

 any prominent ridges; trunk short, strongly compressed; a single 

 long dorsal of low rays, confluent around the leptocercal tail with 

 the still lower anal; ventrals small, with only five rays, inserted in 

 advance of pectorals ; eye very small ; mouth inferior, wholly behind 

 orbit; teeth small, in bands, on jaws only; four gills on short arches, 

 the first free, without a fold of membrane, a slit behind the last gill ; 

 gill-rakers long and slender ; short pseudobranchiae ; gill membranes 

 free from the isthmus, united anteriorly; seven branchiostegals ; 

 anus immediately before anal fin; lateral line with scattered pores; 

 scales small, covered with spinules, and very irregular on head. 

 (Squalus, a shark; Gadus, the cod.) 

 Type of the genus. — Squalogadus modificatus, new species. 



5. SQUALOGADUS MODIFICATUS, new specieB. 



Plate 8, fig. 2. 



Type-specimen. — 327 mm. in total length, 124 mm. from tip of 

 snout to anus; from Albatross station 4956, in Bungo Channel, off 

 Kyushu, at a depth of 720 fathoms; Cat. No. 76864, U.S.N.M. 



Dorsal contour of trunk and tail gently descending posteriorly, 

 ventral contour straight and nearly horizontal ; body strongly com- 



1 Radclitfe, Proc. U. S. Nat. Miis., vol. 43, 1912, p. 138. 



