DISCUSSION OP SPECIES AND THEIR DISTRIBUTION. 155 



SPINIVOMER. Gill and Ryder. 



Spinivomcr, Gill and Ryder, Troe. U. S. N;it. Mas. vi, 1S8;1, 2(11. — Joudax, Cat. Fl«h. N. Aincr., 57. — Jordan 

 and Davls, Rep. U. S. F. C, 1888, 653. 



Neiiiiclitbyiils witli a rectilinear occipitorostral outliiu', with very attonuiited jaws, 

 high inanilibular rami, the branchial ai>ertiires nearly contlueiit, enhireed acute conic teeth 

 in a median row on the vomer, and with a silvery epich'rinis, anil a liliform tail. {(.iUl and 

 Ryder.) 



SPINIVOMER GOODEI. Gill and Ryder. 

 Spiniromer (iondci, GiLL.iud Ryder, loc. (;i(.,253, L'55, 261. 



The rays are ensheathed iu a tough membrane which renders it impossible at present 

 to ennmerate tlicni witli exactit\ide. They are, however, it is to be noted, more distant 

 from each otlier, and conseiiuently fewer than in Serriromcr. 



The iish lias a silvery sheen by which, as well as by the smaller eyes and deeper mandi- 

 bles, it may be at once recognized from its relations. 



This is the smallest of the fanuly, bnt a beautiful silvery form. The total length of 

 the only specimen found is 0.13 of a meter, and its greatest. ludglit (at the bran(-hial region) 

 is 0.0025 meter. {Gill and Eydcr.) 



A single specimen (Cat. 'No. .'53293, U.S. N. M.) was obtaine<l by the A llxdntxn at station 

 2039, in 38c> 19' 20" N. hit., 68° 20' 20" W. Ion., at a depth of 2,301 fathoms. 



SERRIVOMER, Gill and Ryder. 



Serrivomer, Gill and Ryder, Proo. U. S. N. JI., vr, 18s:{, 2(i0.— .Iokdax, Cat. Fish, N. A., .57.— .Jordan and 

 Davis, Rei>. U. S. F. C, 1888, (i5S. 



liemichthyids with the liead behind eyes of an elongated parallelogramic form, with 

 moderately attenuated jaws, branchiostegal membrane confluent at the posterior margin, but 

 with the branchial <apcrtm-es limited by au isthmus except at the margin, and with laucet- 

 -shaped vomerme teeth in a crowded (sometimes doubled) row. (GUI and liyder.) 



SERRIVOMER HEANll, Gill and Ryder. (Fifjure 175.) 



Sen-ivomcr Ileanil, Gill and Rtdek, Proc. U. S. Nat. Mus., \ i, 1883, 260, 261.— Jorda.v and Davis, R(:\>. U. S. 

 F. C, 1888, 653. 



The Stoutest species of the family and with much shorter jaws than any other, and with 

 a very formidable vomerine armature. The total length of the single specimen obtained was 

 0.594 meter; its height at the vertical of the mandibular articulation is O.OIG meter, and the 

 greatest height of the body (just behind the branchial apertures) is 0.02 meter. 



Radial fornuila: 1). 157; A. 138. 



The specimen (Cat. No. 3.3383, U. S. >\ M.) was" taken by the AllmU-o.^s at .station 

 2075, in 41° 40' 30" N. lat., 65° 28' 30" W. Ion., at a depth of 855 fathoms. 



SERRIVOMER KICHARDII, (Vaii.laxt), Goode and Kea-N. 



yemichthys Richardi, Vaillaxt, op. cil., Appendix, 93. 

 AvocetUna Bichardi, Jordan and Davis, Rep. U. S. F. C, 1888, (1891) 655. 



Nemichthys infans, YaillaNT, Exp. Sci. Travaillonr et Talisman, 1888, 95, pi. vii, tigs. 1, la (not A', iiifans 

 of Guntbcr). 



The description of this species given by Giinther (Preliminary notice 1873, p. 251) 

 being very brief, the example dredged from the Talisiiiaii, on the other liand, leaving nnieh 

 to be desired in the way of ]>reservation, the ailinity is doubtful. 



The example, moreover, if we may be able to judge, is a little more nearly cylindrical 

 in form. The muzzle is sharply conical, the teeth of the jaws rasi)like, similar to those of 

 Ifemiehthys scoh, parens, Richardson. The eye appears small, nearer to the extremity of the 

 snout than to the branchial orifice. 



