Bulletin 47, United States National 



teeth ; pectoral fin about a* long a* the bead is high ; gill openings a 

 little less than eye ; postorbital part of head contained about 4 times in 

 trunk ; dorsal beginning over pectorals, consisting of very delicate rays ; 

 trunk contained at least 12 times in tail; greatest depth of body about. 

 equal to head without snout. Lateral line with one series of con- 

 spicuous pores. Color uniform black, jaws lighter. Deep sea ; known 

 from West Indies, mid-Atlantic, oft' Pernambnco. Also from Alaska, the 

 present description from a specimen taken by Dr. Gilbert off the coast of 

 Alaska, apparently referable to A. gilli, but agreeing with Gtintber's figure 

 of A. infan*. (in fans, immature.) 



Nemichifiyt in/an*,* GC XTH ER, ADD. and Mag. Nat. Htot., 1878, 24, and in Voyage Challenger, xxn, 



264, 1887, mid-Atlantic, 2,500 fathom*. 

 1 Labietiltiy^ giHi t BEAM, Proc. U. 8. Nat. Mn,, 1890, 4T, east of Prince of Walea laland, 



Alaska. (Type, No. 44239. Coll. Albatro*.) 

 Avoeettbia infant, JORDAN It DATI*, I. ., 666. 



170. LABICHTHYS, Gill & Ryder. 



IMhthyt, GILL It RYDER, Proc. U. 8. Nat. Mtw., 1883, 261, (corfeato,). 



According to Goode & Bean the scantily described genus Labiohthy* is 

 identical with Avocettina.t The following is the original diagnosis: 



Nemicbthyids with the bead behind the eyes, contracted, with very 

 attenuated jaws, the branchiostegal membrane connected to the throat, 

 and the branchial apertures limited to the sides ; with small, conical teeth 

 in a band along the vomer, and otherwise dentition of Nemichthyv; a black 

 epidermis, and the tail abruptly truncated. (Gill &, Ryder.) (fa3i/, grip 

 or hold, correlated with XafKf, forceps; Itfbf, fish.) 



a. Ridge* bounding the median rortral groove converging backward in a median keel. 



CARIVATV0, 603. 



oa. Ridges bounding the median roetral groove not confluent backward in a keel. 



ELOMOATV0, 004. 



603. LAWCHTH YK ( ABIN ATI K, Gill A Ryder. 



The ridges that bound the median rostral groove converging and form- 

 ing a carina along the median line in vertical from the anterior border of 

 the orbit; greatest height 34* in total length. Color black. (Gill & 

 Ryder.) Dorsal beginning over base of pectoral ; vent close behind the 

 pectorals. (Bean.) Gulf Stream, 41 13'N., 65 33'W.; a scantily described 

 species, not seen by us. (carinatutt, keeled.) 



/,,/</,% cartoatiu, GILL & RYDER, Proc. U. 8. Nat. Mo., 1883, 263, 266, 261, Gulf Stream; 

 JORDAK DAVUS, Z. c., 666. (Type, No. 33369. Coll. Albatrom.) 



* NetnichOtyt infant, GC VTHER : Body much leal elongat^ /- 



ti,,,*,.-^!,,,,.,.,,:,. v.nttv.i-.- .,r ti,M'<r a- dfttant from root oi j/'t.,r ;i )- M \* Che fatter from ej 



t Labichthyt gW, BEAK : Eye half length of pottorbital part of hea4 and % length of pectoral. 



POftOfWtftl J .:i it. of ,-.vl j--. ^ npp<-r j:tw:trj<J ,"-, of lov.<-r (M-JIJ Jiut'l'-'.f i;,otitl,. |j<,r-:il h-t'in/H/j}.' 

 Deafly OTer end of |,<-rt,,ral. V< ;r ,t .ii^-.tar.t from >- :i 'l ftnM -|u*l " 1 tini-H j,',-t,r,it;il i/.-.rt 

 <,f ..:.vl. I). :J ,lh of \,<,<\y < ; ')M&lr J. : i, t .th of j:;tl without fc r,.,ut. ^, ( of tot;il. IJM-:I| ravK v-ry 



bort; longest anal ran t length of bead. Lateral line of one writ* of large pore*. Color 

 ijr.if-.rm black. Length 184 inches. Type from eat of Prince of Wale* MandJMP 2CK N., 136 

 / W^at 1,669 fothonn. (Bean.) Plota^ identical wHh^M*ttM<i 



; w, rtiov it i < |<t thin view vreito it not that the type of CdM " <K asid to have th vnt at 

 ththroRta^ H, MmMMfff, Tb poitorfoi porttou of the rent define* Avocetttna. 



