[117] CATALOGUE OF THE FISHES OF NORTH AMERICA. 

 Family CXXXI.— TKICHODONTID^. (102 b.) 



462.— TRIG HODON Steller. (337) 



1422. Trichodon trichodon Tileslus. A. (975) 



1423. Trichodon japonicus ' Steindachnor. A. 



Family CXXXII.— LEPTOSCOPID^. (113) 



463.— DACTYLOSCOPUS Gill. (400) 



1424. Dactyloscopus mundus - Gill. P. 



1425. Dactyloscopus pectoralis' Gill. P. 



1426. Dactyloscopus tridigitatus Gill. W. (1151) 



464.— MYXOD AGNUS ^ Gill. 



1427. Myxodagnus opercularis Gill. 1'. 



Family CXXXIII.— DEANOSCOPID^. (103) 



465— UPSILONPHORUS^' Gill. (338) 



1428. Upsilonphorus y-graecum Cuv. & Val. S. (976) 



1429. Upsilonphorus guttatus Abbott. K. S. (977 j 



' Trichodon japanicua Steindachner. 



Form of body and coloration of 7'. trichodon. First dorsal bigh, triangular, formed 

 of ten slender spines, and separated by a long interval from the second dorsal. Pre- 

 opercle with five sharp spines ; the two spines on the preorbital very small. Pectoral 

 well developed, all its rays simple, the lower a little thickened; the fin considerably 

 longer than the head and reaching past the last spine of the dorsal. Anal fin with 

 its rays gradually longer posteriorlj-. Dentition as in T. trichodon, the mouth rather 

 more oblique than in the latter. Head 3f : depth 3|. D. X-13 ; A. 31 ; P. 25 ; L. 4^ 

 inches. Strietok, in the sea of Japan, and Sitka, Alaska {Steindachner). 



(Steindachner, Ichth. , Beitr. , X, 4, 1881. ) 



"^ Dactylagnns mundus Gill, Proc.Ac. Nat. Sci. Phila., 1862, 505. Jordan & Gilbert, 

 Proc. U. S. Nat. Mns., 1882, 628. Cape San Lucas to Panama. 



We find very small pseudobranchiie present in living examples of Dactyloscopus 

 tridigitatus. Probably none of the family are wholly destitute of these organs. 



^ Vactyloscopns2ycctoralis GiUyPvoc. Ac. l!i fit. Sci. Phila., 1861,267. Cape San Lucas. 



■• Myxodagnus Gill. 



(Gill, Proc. Ac. Nat. Sci. Phila., 1861, 269, 270 ; type Myxodagnus opercularis Gill.) 



This genus differs from Dactyloscopus in the form of the head, which is elongate- 

 conoid, the lower jaw obtusely pointed and provided with a short flap in front. The 

 pseudobrauchiifi are well devi loped and the dorsal fin commences far behind the nape. 

 One species known. (Myxodes, a genus of blennies ; ayvoi, an old name of Uranoscopua 

 scaber.) Myxodagnus opercularis Gill, 1. c, 270. Cape San Lucas. 



^Instead of genus Astroscopus as given in the Synopsis (p. 627) read: 



Upsilonphorus Gill. 



(Gill, Proc. U. S. Nat. Mus., 1861, 113; type Uranoscopus y-grcecum Cuv. & Val.) 



The detiuition of Astroscopus in the text applies entirely to this genus. (2''ipiXov, 

 v; (popsco, to hear.) 



The species of this genus should stand as: 



Upsilonphorus y-grwcum (C. »fe V. ) Gill. 



The comparison made on page 941 between A. y-grcecum and A. anoplus should be 

 suppressed, as the specimens there called anoplus were the young of y-grcecum, and 

 the differences noted are the changes produced by age. 



Upsilonphorus guttatus (Abbott) Gill. 



This is the species called Astroscopus anoplus by Bean (Proc. U. S. Nat. Mus., 1879, 60) 

 and by us in the text on page 629. The original anoplus is, however, very different. 



