DISCUSSION OF SPECIES AND THEIR DISTRIBUTION. 389 



Cephalic appendage reaches nearly to base of first dorsal, its length (10 millimeters) 

 4i in total. 



Distance of dorsal from snout (17 millimeters) 2J in total; that of anal the same. 



The dorsal and anal fins received in a groove formed by tlie scales along their bases. 



Anterior portion of second dorsal and second anal less elevated than in B. Macclellnndii. 

 The dift'erentiations between the developed and undeveloped rays of the anal are so slight 

 that the limits of the so-called anterior and posterior sections of the fin can not be 

 determined. 



Length of the longest anal ray (22 millimeters) about 2 in body length. 



Radial formula: 1). 1 + 15-10; A. 15-10 + x {1 or S) + 21-22. 



Specimens were obtained by the BlaJce at the following stations: XCIX, off Granada, 

 90 fathoms; cxiir, oft' Neris, 305 fathoms; clxxxv, lat. 25° 33' N., Ion. 84° 21' W., 101 

 fathoms. 



Family MACRURID^E. 



iA(icr«ii(Zfc, Bonaparte, Niiovi AniiaU Sci. Nat. (857), 1838, 13J; Catologo Metodico, 1876, 41.— Gunther, 

 Cat. Fish. Brit. Mus., iv, 390.— Gill, Arr. Earn. Fish., 1872, 3 (No. 16); .lolmsou's Cyclopiedia, II, 1614; 

 Proc. Acad. Nat. .Sci. Pliila., 1804, 174. — Jorda>j and Gilbert, Bull, xvi, U. S. Nat. Mus., 811. 



Lepidoleprida; .Swainson, Hist. Nat. Fisli., 1839, ii. 179. 



Lepidosomatida; Ada.ms, Man. Nat. Ilist., 1864, 101. 



Gadoidea with body terminating in a tapering, long, and compressed tail, and covered 

 by keeled or ornamented scales. Teeth villiforin or cardiform, in bands in jaws. Premax- 

 illary ijrotiactile. First dorsal near the head, distinct and short; second of feeble ray.s, 

 similar to the anal, the two encompassing the tail. No difierentiated caudal. Ventrals 

 thoracic or jugular and of several rays. Pseud obranchiie none. Air-bladder present. 



SYSTEMATIC KEY TO THE SUBFAMILIES AND GENERA. 



(After Giinther, modified and extended.) 



I. A fold of membrauo of gill-cavity across terminal portion of first branchial arch. Barbel present. 4 

 gills. No pseudobranchia; MuouritKe 



A. Teeth in villiform bands above and below, th.itof the lower jaw always broadest near the symphysis, 



and sometimes tapering into a scries on the side of the jaw. 



1. Scales distinctly imbricate, without enlarged dorsal scales. 



a. Scales spinigerous. 



Mouth iuferior; infraorljitiil ridge more or less distinct. Dorsal spine serrated... Macruri's 

 Mouth entirely at the lower side of the head, a longitudinal ridge dividing the infraorbital 

 region into a vertical .and subhorizontal portion. Dorsal spine smootli. 



CCELORHYNCHUS 



Mouth wide and lateral. 



Dorsal spine finely barbed Coryph^NOIDES 



Dorsal spine smooth Uymknocephalus (=Mystaconurus) 



h. Scales snu)oth Lionurus 



2. Scales indistinct, the whole skin covered with villi isities Trachonurus 



3. A series of enlarged sc-iles along the base of the dorsal and anal fins Cetonurus 



B. Internuaxillary het(irodont, with an outer series of strong, widely-set teetb, aud an inner villiform 



band; mandibulary teeth Jiniserial. 



1. Dorsal sjiine serrated Chalinura 



2. Dorsal spine smooth Optonurus 



C. Intermaxillary teeth uni- or biserial; mandibulary teeth uuiserial. 



1. Dorsal origin over origin of pector.al. 



a. Ventrals short and weak, pectorals i)la<ed very liigh, ojiposite U|)per angle of gill-cleft; lat- 

 eral line originating at upper angle of gill-cleft. Muciferous cavities wide. Dorsal 

 spine smooth. Scales small, bristly Malacocephalus 



2. First dorsal behiiul origin of pectorals. Muciferous c^avities small. 



a. Dorsals se])arated by a lonsidi lable space. Dorsal and anal similar in height and appear- 

 ance Ne.matonuri'S 



6. Dorsals subcontnnous. Anal nuicii higher than second dorsal Mosf.lkya 



D. Intermaxillary teeth villiform; mandibulary teetb uniserial. 



1. Dorsal, ventral and pectoral origins nearly in the same vortical. Pectorals very long, spatu- 

 late Abyssicola 



