526 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



Patella (Helcioniscus) exarata (Nutt.) Reeve. 



A siugle specimen of this well known Hawaiian species was found on 

 the beach Tiear Point Barrow, having doubtless been thrown overboard 

 by some whaler with ballast. The fact of its occurrence is interesting 

 as illustrating accidents of distribution like Mr. Lord's living Orthalicus 

 undatns from Vancouver Island. 



Cylichna propiuqua M. Sars. 

 Abundant in 2 to 5 fathoms off Cape Sraythe. 



ACEPHALA. 



Cryptodon sericatus Cpr. 



At Cape Smythe and off Point Franklin. 



Astarte (Rictocyma) esquimalti (Baird) Dall. 

 CrassattUa esquimalti Baird. 

 Kictocyma miraUiis Dall. 



Two specimens off Cape Franklin in 13 fathoms. 



This completes the list of especially interesting forms. The total 

 number found was sixty-one species or varieties, which will be fully 

 enumerated and reported upon in the general report upon the results 

 of the Point Barrow expedition, under the auspices of the United States 

 Signal Service. 



July 8, 1884. 



DESCRIPTION OP A NEW SPECIES OP HYBOPSIS (HYBOPSIS MON- 



TANTJS). 



Br SETH E. MEEK. 



Hybopsis montanus sp. nov. (36882.) 



Head, 3§; depth, 5; dorsal rays, 8; anal, 6; scales, 4-37-4; body 

 elongated, slender, little compressed; eye rather high up, moderate, 

 3f in head ; snout blunt, rather long, 3| in head ; margin of upper lip 

 on level of lower margin of eye ; mouth rather large, somewhat infe- 

 rior, lower jaw included, much shorter than upper, end of maxillary 

 reaching slightly past vertical from front of eye; a long barbel at its 

 posterior extremity; length of maxillarj" (without barbel) 3 in head. 



Origin of dorsal slightly nearer base of caudal than tip of snout, tips 

 of anterior rays of dorsal extending past tips of posterior ones when 

 the fin is deflected. Length of longest dorsal ray 1^ in head, and about 

 twice as long as base of fin. Scales in front of dorsal about 14. Origin 

 of dorsal above origin of ventrals ; tips of pectorals scarcely reaching 

 ventrals; tii)S of ventrals reaching to vent. Pectorals, If in head; 

 ventrals, 2^ in head; longest anal ray, 2 in head ; length of its base, 3 

 in head ; caudal forked, its inner rays half the length of outer ones, 

 lower lobe longer and narrower than upper. Teeth 4, 4, little hooked, 



