Jordan and Evermann. Fishes of North America. 609 



oo. Snout moderately produced (its length not exceeding postocular portion of head). 



6. Preoral portion of snout contained 3 times in its entire length ; diameter of eye % 

 width of interorbital space (f postocular portion of head). About 26 scales in lat- 

 eral line in front of vent. MACROCHIRA, 908. 

 66. Preoral portion of snout 3% in its length ; diameter of eye less than % width of inter- 

 orbital space (5 in postocular portion of head). GOODEI, 909. 

 666. Preoral portion of snout 2% in its length ; diameter of eyo exceeds width of inter- 

 orbitul space (= 2% in postorbital length of head). Dorsal origin behind root 

 of ventral. Eighteen to twenty scales in lateral lino in front of vent ; slender, 

 depth 20% in total length. GRACILIS, 910. 

 6666. Preoral portion of snout about 2 in its length ; diameter of eye equal to width of 

 interorbital space (2 in postorbital length of head). Dorsal origin over base of 

 last rays of ventral. Twenty-seven scales in lateral line in front of vent ; 

 stout, depth 15 in total length. PALLIUA, 911. 



907. ALDROVANDIA ROSTRATA (Gunther). 



Head 8, much exceeding height of body. D. 9 ; V. 9 ; B. 9. Scales 

 13-24-6. Snout very much produced, spatulate, its preoral portion being 

 more than | its length. Eye of moderate size, its length being of 

 postocular portion of head, and considerably less than width of interorb- 

 ital space. Maxillary scarcely reaching front margin of eye. Length 

 of head a little more than its distance from root of ventral, which is 

 nearly entirely situated before the dorsal. Nearly all the scales are lost, 

 but some of the lateral line remain ; they are much larger than the other 

 scales ; and on the tail, where the lateral line approaches the lower 

 profile, these larger scales fill up all the space between the lateral line 

 and the anal fin. Bones of head very thin ; operculum smooth, covered 

 with a very fine membrane. Lower part of side of head occupied from 

 the snout to gill opening by two exceedingly wide muciferous channels, 

 of which one takes its origin on the preorbital, the other on the mandible, 

 and which open behind at the gill opening by a common and very wide 

 aperture. Branchial apparatus as in the other species. Dentition very 

 similar to that of Aldrovandiamacrochir, but the palatine patches crescent- 

 shaped and rather widely separated from pterygoid band. Scales of lateral 

 line about 3 times size of others, and about 24 in number between gill 

 opening and vent, each bearing a luminous organ, vertically elongated 

 and rhombic, but not extending to upper and lower margins of scales. 

 Light colored, lower part of head and gill cover black ; abdominal region 

 blackish. Length 20 inches. One specimen, from Challenger Station 63, 

 mid-Atlantic. (Gunther.) (rostratus, long-nosed.) 



Halosaurus roslratus, GUNTHER, Ann. & Mag. Nat. Hist., 1878, n, i52, mid-Atlantic; G(JNTHER, 



Challenger Keport, xxn, 241, pi. LIX, fig. D, 1887. 

 Aldrovandia rostrata, GOODE & BEAN, Oceanic Ichthyology, 132, 1895. 



908. ALDROVANDIA MACROCHIR (Gunther). 



B. 12 ; D. 13 j V. 10 j P. 11-13. Scales 14 x 5. Snout moderately produced, 

 the preoral portion forming only i of its length. Eye rather small, i of 

 postocular portion of head, and \ width of interorbital space. Maxillary 

 reaching to front margin of eye ; length of head more than its distance 

 from root of ventral, the origin of which is immediately in front of that 

 F . N . A. 40 



