136 DEEP-SEA FISHES OF THE ATLANTIC BASIN. 



and about 2£ rows between the lateral line and the origin of the ventral. The lateral line 

 is composed of enlarged and modified scales, and becomes obliterated about the middle of 

 the length of the tail. There are 15 or 16 of these enlarged scales between the head and 

 the origin of the ventral; about 27 between the vent and the head. The distance from the 

 origin of the ventral to the anus (73 millimeters) is nearly equal to the length of the head. 

 The anal fin begins not far behind the vent and contains about 100 rays. The caudal, which 

 is long and slender, contains about 1 rays; the pectoral 13. The membrane covering the 

 anal rays is scaled throughout almost its entire length. Gill rakers rather short and few; 

 three above the angle, twelve below. 



The color of the scales is a light silvery r gray, through which the body color appears as 

 alight orange-brown. Branchiostegal membrane and opercular bones bluish. Inside of 

 gill covers very dark blue. 



A single individual, the type of the species, 600 millimeters in length, was taken by the 

 Blake at Station clxxiii, in 24° 30' 1ST. lat., 84° 05' W. Ion., at a depth of 955 fathoms. 



Specimens were also obtained by the Albatross, as follows: No. 38140, U. S. N. M.,from 

 Station 2729, in 30° 26' 1ST. lat., 74° 32' W. Ion., at a depth of 679 fathoms; No. 33379, U. S. 

 N. M., from station 2072, in 41° 53' N. lat., 05° 35' W. Ion., at a depth of 858 fathoms; No. 

 35418, U. S. N. M., from station 2181, in 39° 29' N. lat., 71° 40' W. Ion., at a depth of 093 

 fathoms; No. 35551, U. S. X. M., from station 2210, in 39° 47' N. lat., 70= 30' 30" W, Ion., at 

 a depth of 963 fathoms; No. 35038, U. S. N. M., from station 2231, in 38° 29' N. lat,, 73° 09' 

 W. Ion., at a depth of 965 fathoms, and also from station 2381, in 28° 05' N. lat., 87° 56' 15" 

 W. Ion., at a depth of 1,330 fathoms; station 2380, in 28° 02' 30" N.lat., 87° 43' 45" W.lon., 

 at a depth of 1,430 fathoms, and station 2533, in 40° 16' 30" N, lat., 67° 26' 15" W. Ion., at 

 a depth of 828 fathoms. 



HALOSAURICHTHYS, Alcock. 



Halosaurirhthys, Alcock, Ann. and Mag. Nat. Hist., 1889 (Nov.), 454; Bathybial Fishes of the Bay of 

 Bengal, 30. 



Halosaurids having body long and low, somewhat compressed. Scales of lateral line 

 not enlarged. Tail long and tapering. Snout overhanging the mouth. Mouth narrow. Teeth 

 villiform in broad bands on jaws and hyoid, forming a broad crescent in the prominent 

 loose palatines and a short, narrow band in the pterygoids. A long, rudimentary second dor- 

 sal and a short first dorsal over axil of ventrals. Anal confluent with caudal. Ventrals 

 united in a broad, flat plate. 



A single species, H. carinicauda, represented by a single specimen taken by the Inves- 

 tigator in the Andaman Sea, 490 fathoms. 



Order APODES. 



Apodcs, Kacp, Catalogue of Apodal Fishes in British Museum, 1856. — Jordan and Gilbert, Bulletin xvi, 

 U. S. Nat, Mus., 354.— Gill, Century Dictionary,- 262. 



Physostome fishes with the intermaxillaries atrophied or lost, the supermaxillaries lat- 

 eral, and with scapular arch but slightly developed and free behind the cranium. No ven- 

 tral fins. Symplectic bone lacking. Opercular apparatus and palatopterygoid arch but 

 slightly developed. Scales minute or wanting. No psendobrauchue, Gill openings mod- 

 erate. Air bladder (if present) with pneumatic duct. Vertebra} numerous. Vertical fins 

 spineless, usually confluent at caudal. 



ARTIFICIAL KEY TO THE DEEP-SEA FAMILIES OF APODES. 



I. Tongue with free margin, more or less broad. 

 A. Pectoral fins present. 



1. Gill openings distinct and separate. 



a. Gill openings lateral. Scales present or absent. 



