280 DEEP-SEA FISHES OF THE ATLANTIC BASIN. 



the head. The tip of the pectoral when extended is about under the second or third ray of 

 the dorsal. The anal origin is under the ninth or tenth dorsal ray. The length of the 

 middle caudal ray (16 millimeters) is contained 10i times in the standard length. The 

 longest pectoral ray (18 millimeters) ecpuals half the distance from the snout to the dorsal. 

 The longest ray of the isolated portion of the fin (10 millimeters) equals that of the middle 

 caudal ray. The distance of the vent from the tip of the snout (23 millimeters) is nearly 

 equal to the length of the head. The vent is directly under the base of the pectoral; it is 

 a narrow slit placed horizontally. Pyloric caeca 4 to (!. 



Color: Auterior half of body very pale, whitish; posterior half very light brown; 

 snout, chin, and edge of gill-opening and region about the vent black. 



Eadial formula: D. 60; A. 55; P. 17 + 4; C. 10. 



The eggs of an example a little smaller than the type of the description have a diam- 

 eter of about 3 millimeters. At the same time the ovaries contain some eggs, which have 

 not reached maturity, whose diameter is only about one-half millimeter. The stomach is a 

 stout subspherical receptacle, its greatest width two thirds of its length. 



The type specimen (Cat. No. 35637, U. S. N. M.) was taken by the Albatross on Sept. 

 13, 1884, from station 2232, in 39° 12' 17" N. lat., 72° 09'*30" W. Ion., at a depth of 520 

 fathoms. Specimens were also taken by the same vessel from station 2546, in 39° 53' 30" 

 N. lat., 70° 17' 30" W. Ion., at a depth of 538 fathoms; from station 2187, in 39° 49' 30" N. 

 lat.. 71 10 W. lorn, at a depth of 420 fathoms; and fragments of an individual (No. 35479, 

 U. S. N. M.) from station 2186, in 39° 52' 15" N. lat,, 70° 55' 30" W. Ion., in 353 fathoms. 



HILGENDORFIA, Goode and Bean, n. g. 



Liparids with large, high, compressed head whoso bones are exceedingly thin, cavernous; 

 jaws even in front, Vertical tins represented by broad median folds, confluent at the pos- 

 terior end of the body, where the caudal is represented by two or three extremely fine, 

 slender terminal filaments. Pectoral very large, broad-based, with membranes fringed pos 

 teriorly and having several of the lower rays free, though not forming a distinct portion of 

 the fin. No ventral disk. Vent far advanced, opposite hind margin of orbit. Gill opening 

 as in Monomitra. 



The type described by Giinther is only 60 millimeters in length, and he remarks 

 concerning it that it is uncertain whether it represents a form in which embryonic charac- 

 ters are persistent, or merely an early stage of development. 



Its peculiarities seem sufficient to warrant its being set apart for further study before it 

 is merged with Paraliparis. It is named for Dr. Franz Uilgendorf, of the Royal Zoological 

 Museum, Berlin 



HILGENDORFIA MEMBRANACEA, (Gi'vniER), Goode and Bean. 



Paraliparis memhranaceus, Gcntiier, Challenger Report, xxn, 1887, p. 69, pi. XII, fig. D. 



Head very large, compressed, about as high as long, with the upper profile descending 

 in a parabolic curve. The abdominal cavity, black and transparent through the integu- 

 ments, is excessively short; the tail compressed and gradually tapering into a fine point, 

 The whole of the integuments are colorless, with minute scattered points of pigment, A 

 broad median dorsal fold rises from the top of the snout and is continued to the extremity 

 of the tail, gradually disappearing as it approaches the caudal fin, which is represented by 

 two or three extremely tine and rather long terminal filaments. The fold is highest above 

 the posterior portion of the abdomen; there also fin rays commence to be developed, which 

 on the anterior half of the tail are distinct enough, but become more crowded posteriorly 

 and almost indistinguishable. The anal has a similar structure; it also starts as a fold 

 from the vent, which is far advanced, opposite to the hind margin of the orbit; rays are 

 developed from the posterior end of the abdominal cavity, whence the fin is continued in 

 the same manner as the dorsal. 



Pectoral fin very large, with a very broad base, extending from the upper end of the 

 gill opening forward nearly to the hyoid bone; its principal portion consists of an extremely 



