PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 3f)3 



Owing- to the imperfectioDS of the descriptions of the species of the 

 '< WiUemoesia group," tdready known, it is useless to attempt to point 

 out which of the characters above alhided to are common to all the 

 species |or only specifically or generically (if there be more than one 

 genus among- the species now known) characteristic. 



In regard to the openings of the green glands it may be well to notice 

 that Willemoes-Suhm was unable to discover them in Willemoesia lepto- 

 dactyla. He might easily have overlooked them, however, if they were, 

 as is probable, situt^.ted as in our species. One of Bate's figures of 

 Fentacheles anthrax (Annals and Mag. Nat. Hist., V, ii, pi. 13, fig. 2,, 

 1878) apparently shows the tubular process just as it exists in our 

 species, although I find no reference to it in the accompanying text. 

 Bate subsequently, however, appears to allude to this same process as 

 " the olfactory tubercle of the second or outer antenna," though I can- 

 not find that he anywhere alludes to Willemoes-Suhm's inability to dis- 

 cover the openings of the green glands. 



New Haven, Conn., Becemher 30, 1879. 



DESCRIPTIONS OF SOIVIC: GENERA AND SPECIES OF AI.ASKAN 

 FISHES. 



By TARtETON H. BEAN. 



The collections of the United States National Museum contain many 

 Alaskan fishes, two of which are here described as new to science. 



Cottus polyacanthocephalus Pallas. 



This species has some points in common with Boreocottus axillaris 

 Gill. I cannot find, in the description of the genus Boreocottus, any- 

 thing to separate it from Cottus. The specimens here described are 

 numbered 23499 in the Museum register. They were collected at 

 TJnalaska, by Mr. William H. Dall, and were catalogued in his note- 

 book at No. 900. 



LIST OF SPECIMENS. 



23499 a. Length 185 millimeters without caudal. 



D. X, i, 14; A. 13; V. I, 3; P. 18. 

 23499 b. Length 138 millimeters without caudal. 



D. X, i, 13; A. 11; V.I, 3; P. 18. 

 23499 e. Length 142 millimeters without caudal. 



D. X, i, 14; A. 12; V. I, 3; P. (right) 18, (left) 16. 



» DIAGNOSIS. 



B. VL D. X. I, 13 to 14. A. 11-13. Y. I, 3. P. 18. 



Two small spines above the snout; one above each orbit, with four 

 obscure ones behind it. A pair of small spines on the occiput. Three 

 Proc. Nat. Mus. 79 23 March 99, 1880. 



