164 DEEP-SEA FISHES OF THE ATLANTIC BASIN. 



1. Lateral line inconspicuous, nearer to ilorKal tbau to ventral outline throughout, not arched ante- 



riorly. D. vi-vill. 



a. Last dorsal spines over anterior part of soft anal. A. xii X. Bonapartii 



h. Porsal and .soft anal not passing same vortical. A. xiii-xi v N. sexsjnnis 



2. Literal line slii;htly arched above pectoral, sinking to median line of body in advance of first 



dorsal spines. D. x. 



a. Last dorsal spine over liftli from last anal spino. Fins low. A. xix y. jiliasnanorus 



II. Origin of dorsal oppo.sito that of anal. Lip absent in middle portion Gigliolia 



A. liody much higher over voul.rals than over pectorals and comparatively short. 



1. Lateral line arched over vontrals and pectorals. 1). viil. ^ 



a. Snout thick, swollen. A. xv-xvui G. Moaeleyi 



NOTACANTHUS NASUS, Bloch. (Figure 183). 



Acanthonotus nasus, Bloch, Ausl. Fische, xii, 114. — Schneidek, Bloch's Systema Ichthyologiaj, 1801, 390. 

 Notacanthita nasun, Bloch, Fische, vii, 113, pi. 431.— Cuvier and Valenciennes, Hist. Nat. Poiss., vui, 467, 



pi. ccxLi.— LOtken, Vid. Med., 1878, 145.— Gunther, Cat. Fish. Brit. Mus., in, 544; Challenger Report, 



XXII, 248. — GlGLioi.i, Eleuco, 94. — Vaillant, Exp. Sci. Travailleux et Talisman, 317. 

 Campylodon Fahrkii, Keinhaudt, Vidensk. Selsk. Afhandl., 1838, 120. 

 Notacanthus Chemnitzii, (Bloch, Abh. Bohm. Gesellsch. 1787).— Jordax and Gilbert, Bull, xvi, U. S. Nat. 



Mus., 370. 

 A Notacanthus with elongate body, whose greatest height lies between the pectoral and 

 ventral fins and is coutaiiied abont ij times in the distance from the vent to the tip of the 

 snout. Head, short, compressed, its length not quite 3i times in distance from vent to snout. 

 Mouth large, extending backward to a point nearly under the eye, the maxillary nearly 

 to the vertical Ii'om the anterior margin of pupil. The mouth does not lie entirely on the 

 under portion of the head, but is sublateral. There are 35 teeth in the intermaxillaries on 

 each side. The distance between the upper profile of the head and the eye is about equal 

 to the diameter of the eye, and the diameter is slightly greater than one-third the length of 

 the snout (certainly not more than one-half the length of the snout), and about one-eighth 

 the length of the head. (In this connection, it is taken for granted that the hole in the skin 

 of the head represents the size of the eye; if, however, we assume that the entire portion 

 free of scales is the eye, the diameter is greater and equal to one-sixth the length of the head. 

 It is, at any rate, considerably less than the width of the iiiterorbital space.) The gill cover 

 appears to be divided to below the symphysis of the operculum (with hyomandibular), and 

 is free from the isthmus (the entire under portion of the head is cut open in the middle). 



Scales are lacking only about the mouth and eyes; about 40 longitudinal rows of 

 small scales (2 millimeters broad, 4 millimeters long) between the ventral outline and the 

 lateral line ; smooth, and imbricated. 



Of the 11 dorsal spines, the first (overlooked by Bloch and Valenciennes) is very small 

 and only visible as a point; placed close to this (1 millimeter) is the second, which is also 

 very short and feeble. The third, though also short, is thicker. The vent lies behind 

 the fifth spine. Of the 15 anal spines, which have their origin immediately behind the 

 vent, the first (overlooked by Bloch and Valeuciennes) is very small; it does not extend 

 beyond the profile; the second and third but slightly. The spines which are longest and 

 placed farthest back still bear traces of a connecting membrane and are probably only 

 worn-oft' rays. The pectorals are inserted somewhat farther back from the gill covers than 

 shown by Bloch; the end is surely broken off, but yet it can hardly be doubted that this 

 fin is too long in Bloch's figure; its base is less than one-sixth the length of the head. 

 The ventral fins, connected behind the median line by a membrane, terminate considerably 

 in advance of tlie vent (they are apparently worn olf a little behind). 



Radial formula: D. xi; A. 15 -f 118 O.?; P. 19; V, 3 + 7 (1), 8 (r).— Branchiostegals, viil, 

 (r)-ix (1). 



Total length (restored) 85 centimeters. Length of head about 10.7 centimeters. 

 Height of body about 8 centimeters. Length of tail about 47.5 centimeters. 



The full diagaosis given above was furnished by our friend Dr. Franz Hilgendorf, Gus- 

 tos of the zoological collections in the Royal Museum of Natural History, Berlin, who 

 also gave the following notes on the present condition of the types: 



The original Bloch specimen (Cat. Gen., No. 1409) is still in existence (our Museum pos- 



