608 Bulletin 47, United States National Museum. 



silvery on abdomen. (Giinther.) Interorbital space less than long diam- 

 eter of eye. Snout scaleless. Mouth moderate, not nearly reaching tip 

 of snout. Dorsal fin over the space between ventral fins and vent ; longest 

 dorsal rays (second and third) t\vice as long as base of fin; pectorals 

 scaleless, longer than ventrals; ventrals scaly. Vent in anterior half of 

 total length, no anal papilla; base of anal scaly; caudal of 2 hair-like 

 rays. Lateral line very low down and disappearing posteriorly. Pyloric 

 cceca 12, small. Air bladder 5 inches long and with a delicate silvery 

 coat. Intestine straight. Peritoneum black anteriorly, posteriorly with 

 patches of black lines on a pale ground. The first individual obtained 

 was caught in February, a female with eggs, in 2 masses lying side by 

 side, 5i inches long, not covered with a sac. (Johnson.) Middle Atlantic, 

 the type from Madeira. Two specimens, 16i inches and 21 inches in length, 

 were obtained by the Albatross at Station 2181, in 693 fathoms. Others 

 obtained by the Blalce at Stations LXVII, 128-240 fathoms, and LXVIII, 

 243-458 fathoms, off Guadeloupe and Santa Lucia. (Named for Prof. 

 Richard Owen, the distinguished anatomist.) 



Halosaurus oweni, JOHNSON, Proc. Zool. Soc. Loud., 1863, 406, pi. xxxvi, fig. 2, Madeira ; GOODE 

 & BEAN, Oceanic Ichthyology, 131, 1895. 



906. HALOSAURUS GUNTHERI, Goode & Bean. 



D. 11; P. 16; V. I, 9; scales 15-X-5; eye 5. Vertex scaly. Snout pro- 

 duced, its preoral portion contained 2& times in its length. Eye large, 2 

 in snout, 2 in postocular portion of the head, and much wider than inter- 

 orbital space; maxillary reaching nearly to front margin of eye. Length 

 of head less than its distance from root of ventral, the origin of which is 

 slightly in front of that of dorsal, the origin of the dorsal being over pos- 

 terior portion of root of ventral, and also over the thirty-first scale in 

 the specialized lateral line; two scales between lateral line and origin 

 of ventral; ventral broad, slightly longer than longest dorsal; pectoral 

 fin moderate, extending less than halfway from its own base to root of 

 ventral, 2 in head. Scales on the lateral line not much enlarged, 67 in 

 advance of vent ; base of dorsal and anal scaly. Color brownish ; under 

 surface of head lighter. A single specimen was obtained by the Albatross 

 from Station 2722, 39 13' N., 72 W., at a depth of 594 fathoms. (Goode 

 & Bean.) (Named for Dr. Albert Giinther.) 



Halosaurus guntheri, GOODE & BEAN, Oceanic Ichthyology, 131, 1895, Gulf Stream. (Type, No. 

 38070. Coll. Albatross.) 



293. ALDROVANDIA, Goode & Bean. 



Aldrovandia, GOODE & BEAN, Oceanic Ichthyology, 132, 1895, (roslrala). 



Ventrals normal ; no second dorsal fin ; vertex scaleless ; scales of 

 lateral line enlarged, provided with photophores. Head with pointed 

 snout and prominent lateral ridges. Anal fin moderate, high, its height 

 ^ to i that of dorsal. (Named for Ulysses Aldrovandus, of Bologna, the 

 founder of the first natural history museum.) 



a. Snout much produced (length equal to or greater than distance from eye to root of pecto- 

 ral) ; preoral portion of snout exceeds % its length ; diameter of eye considerably less 

 than width of interorbital space. Twenty -four scales in lateral line in front of vent. 



BOSTRATA, 907, 



