130 DEEP-SEA FISHES OF THE ATLANTIC BASIN. 



b. Preoral portiou of suout nearly eiiuals half its length. iJiamctor of eye equal to width of 

 interorbital space. Tweuty-niue scales of lateral lino in front of vent. 



[A. AFFiNis (Giinther). South of Japan.]* 

 2. Snout niofleratoly prodncccl (its length not exceeding postocular portion of head). 



a. i'reoral portion of snout contained 3 times in its entire length. Diameter of eye one-half 



■width of interorbital space (two-fifths ])ostocuhir portion of head). About 26 scales in 

 lateral lino in front of vent A. macimh^iiih (Giinther) 



b. Preoral portion of snout 3i in its length. Diameter of eye less than one-h.alf width of inter- 



orbital space (5 in jiostocular portion of head) A. G< ><>i)ia (Gill) 



c. Preoral portion of snout 3* in its length. Diameter of eye eiiual to -width of interorbital space 



(3 in postocular port ion of head). Dorsal origin far behind root of ventral. About 20 sub- 

 oval scales in lateral line in front of vent A. phalacki-.s (Vaillant) 



d. Preoral portiou of snout4 in its length. Diameter of eye two-thirds width of interorbital space 



(== one-fourth postorbital length of head). Dorsal origin behind root of ventral. About 18 

 scales in lateral line in front of vent. . . [A. mediorostris (Giinther). West of Philippines.] 



e. Preoral portion of suout 2i iu its length. Diameter of eye exceeds width of interorbital space 



(=2J in postorl)itnl length of head). Dorsal origin behind root of ventral. Eighteen to 

 twenty scales in lateral line iu front of vent. A slender species; its height 20 J in total 

 length A. gracilis (Goode and Bean) 



f. Preoral portion of snout about 2 in its length. Diameter of eye equal to width of interorbital 



space (2J iu postorbital length of head). Dorsal origin over Ijase of last rays of ventral. 

 Twenty-seven scales in lateral line in front of vent. A stout species; its height 1.5i in total 

 length A. pallida (Goode and Bean) 



g. Preoral portion of snout 2 iu its length. Diameter of eye greater than the width of inter- 



orbital space (2i in postorbital length of head). Scales of lateral line slightly enlarged. A 



slender species [A. anguilliformis (Alcock). Gulf of Manaar.] 



II. Ventrals united into a broad, flat flake. A rudimentary, heel-like second dorsal. 



Vertex scaly. Scales of lateral line not enlarged. Snout elongate Halcsaurichthys, Alcock 



1. Snout produced, its lenth 3 times that of its preoral portion. Diameter of eye greater than 

 width of iuterorbital siiace (2f in postocular portiou of head). 



[H. CARINICA0DA, Alcock. Andaman Sea.] 



HALOSAURUS, Johnson. 



HalonauruK, JonN.SON, Proc. Zoiil. Soc. Lond., 1863, 406. 



Body elongate, clothed with cycloid scales ; belly rounded ; tail compressed and tapering 

 to a point. Snout projecting much beyond the mouth, which is nonprotractile and of mod- 

 erate size, with the upper border formed by the premaxillary and maxillary bones, the 

 former small, the latter of moderate size and not reaching beyond the eye, both dentiferous. 

 Teeth in villiform bands, in the jaws, and on the vomer, palatines, and tongue. A short 

 dorsal over the space between the abdominal ventrals and the long anal, wliich is coalescent 

 with the caudal, the latter consisting of very few rays. Large gill openings. Branchiostegal 

 membrane with numerous rays. Stomach ctecal ; pyloric cteca in moderate number j a large 

 air bladder. No pseudobrauchiai, no barbel nor adipose dorsal. 



HALOSAUEUS OWENI, Johnson. (Figvire 152.) 



Ealosaurus Owcn't, Johnson, P. Z. S. Lond., 1863, 406, pi. xxxvi, fig. 2. — GCkther, Cat., vii, 428; Chal- 

 lenger Report, 1887, xxii, 236. 



The type, from Madeira, llh inches long, was long the only specimen known. 



Snout produced, its preoral portion being nearly one-half of its length. Eye rather 

 large, the length of its diameter being two-fifths of the postocular portion of the head, and 

 much more than the width of the iuterorbital space. The maxillary reaches the vertical 

 from the front margin of the eye. The length of the head is more than its distance from 

 ttie ventral fin, the base of which is entirely in front of and somewhat remote from the 

 base of the dorsal. Pectoral fin with narrow base, very long, extending nearly to the root 

 of the ventral. Scales of the lateral line scarcely larger than the others, without phosphor- 

 escent organs being ^^sible in the only specimen known. Anterior portion of the dorsal fin 

 covered with small scales; anal fin scaleless. Brownish, silvery on the abdomen. (Giinther.) 



* From S. of Japan, Challenger, 565 fathoms, and Andaman Hea, Investigator, 1,000 fathoms. H. Moskgnii, 

 Alcock, is probably the same. 



