484 DEEP-SEA FISHES OF THE ATLANTIC BASIN. 



anal elongate, similar posteriorly. Caudal rhombic, witliout filiform rays. Veutrals 

 subabdominal, coiiiiHi.sed of articulated rays. First four veitebia- elougntcd. (lil! iiiuiii 

 branes separate, free froiu tlie isthmus. 



AULOSTOMA, Lacepede. 



Julonlomu, Lackpkde, Hist. Nat. Poiss., v, 1803, 537.— Gunther, {'at. Fish. Brit. Miis., in, 535.— .I(iui>an 



and (iiLRiCRT, Bull. XVI, IT. S. Nat. Mus., 3M0.— (iii.r,, Pio(\ Ac^ad. Nat. .Sci., Phila., ISSl, ItU. 

 Volypterkhthjin, Blekkeh, Natiirk. Tijrtschr. Ne(lerlainls<-li-IiHlie, l\', 608. 



Aulostomids with body much compressed, teeth riidinientary, and with S to V2 dorsal 

 spines. The dorsal and aual oblong, oj)posite and similar; ea('h witli lioiu 23 to 28 rays. 

 Caudal cuneiform. 



AULOSTOMA LONGIPES, Vaili-ant. (Figure :!!t7.) 



Aulostnma lonyipis, Vaii.lant, Exp. Sci. Travallleur et T.ilisnian, 340, jil. xxvii, fig. 4. 



This species is described by Vaillant from a very small si)ecimen, five millimeters in 

 length, in a bad state of i)reservation from off Morocco in 1,10;? meters. It is referred by 

 him provisionally to tlie genus Ah/o.s'^o(»((, and the figure would seeiu to indicate that his 

 identiticatiou is correct. It may possibly be found to be a young of J., mloratum. 



Body elongate, nearly cylindrical; its height about one-ninth, its thickness one-eleventh 

 of its length. Length of the head a little more than one-third of total length; snout con- 

 taiued two and one-fourtli times in the leugtli of the head. Diameter of the eye apparently 

 about one-eighth of the length of the head; the interorbital space almost nothing. No 

 trace of sc;dcs is visible upon the specimen, and the lateral line is only indicated by a 

 series of pigmentary sjwts. 



In the place of the dorsal, Vaillant found oidy a very short lin, placed far back; and 

 an an.al exactly similar to it in shape and size. Tlie caudal was mutilated, l)ut ajipeared 

 to Yaillaut to have had no prolonged median rays. Pectorals moderately long. Veutrals 

 comi^osed (as nearly as it is possible to determine) of 6 rays, inserted far back and extend- 

 ing to the base of the caiidal, which is hmg, being more than one-third of the entire length 

 of the body. 



Radial formula: D. 5; A. 9+ ; V. 0. 



As Vaillant indicates, the only obstacle in the way of considering this the young of A. 

 colorotum is the x>osition and length (»f the veutrals, and the fact that A. colvrutum has 

 not been found in the eastern Atlantic. 



Order PEDICULATI. 



Carpal bones notably elongate, forming a sort of aim, which supports tiie broad 

 pectorals. Gill openings reduced to a large or small foramen, situated in or near tlie axils, 

 more or less posterior to the pectorals. No scales. Ventral fins jugular, if present; first 

 vertebra united to the cranium by a sucure; epiotics united behind supra-occii)ital; elon- 

 gate basal pectoral radii reduced in number; no interclavicles; post-temporal broad, fiat, 

 simple; superior pharyngeals two, similar, spatulate, with anterior stem and transvci.st! 

 blade; basis of cranium simple. No air duct to the swim bhulder. Anterior dorsal reduced 

 to a few tentacle-like, mostly isolated, spines. {Jordan and Gilbert.) 



ANALYSI.S OF FAMILIES OE PEDICUI.ATI. 



I. Gill openings in, behind, nr lielow the lower axils of the pectorals; mouth large, tt'rniiiial. 



A. Pseudohranchi:o present ; pseudohrachia with two iictiuosts; head l)road, de pressed Loimiiid.e 



B. Pseudohranchiai none; pseudohrachia with throe aetinosts. 



1. Ventral iiiis developed; pectoral members geuiculated, with elongate pseud- 



obrachia Antennauiid.e 



2. Ventral fins obsolete; pectoral nieinbers not geniculate, with moderate pseudohrachia. Cei! ATI ii>.E 

 U. Gill openings in or behind the upper axils ; mouth small, usually inferior Oncuocephalid.k 



