1909.] R. E. Lloyd : Deep-Sea Fish caught by the " Investigator." 149 



1. The premaxillary teeth are fewer in number and are relatively larger; they 

 are arranged in two sets, an anterior closely set group of eight or nine, and a pos- 

 terior group of three with wide intervals between. 



2. The interorbital space is wider than half the diameter of the eye. 



3. The head is covered with a firm smooth skin just as in yl. phosphorops, but 

 in the new species the colour of this skin is a dark slaty blue. The colour of the rest 

 of the body is brownish black. The bases of the fins have a blue tinge. The blue 

 colour is partially preserved in spirit. 



4. The total height is only \ of the total length excluding the caudal fin. 



One specimen, 18 cm. long, from 1,005 fathoms in the Gulf of Oman. Station 354. 

 Registered No. ^^^^. 



Narcetes a finis, Lloyd. 



Ann. Mag. Nat. Hist. (7), vol. xviii, p. 308 (1906) ; Illustr. Zool. " Investigator," Fishes, 

 plate xlii, figs, i, la (1908). 



B. 7, A. 14, D. 17, V. 10, P. 13, L.l. 73, L.tr. 9-1-13. 



Resembles A^. pluriserialis (Garman), and differs from N. erimelas (Alcock) in the 

 following particulars : — 



1. There are seven branchiostegal rays. 



2. The first ray of the anal fin is vertically below the eighth ray of the dorsal. 



3. There is one enlarged tooth on either side of the vomer. 



In all its proportions this species resembles N . pluriserialis very closely. 



It differs from N. pluriserialis in the following respects : — 



The teeth in the maxillae are in two series, an outer series of small teeth and an 

 inner series of larger ones. 



There are only seventy- three scales in the lateral line. 



The scales of the lateral line are large, measuring as much as \ inch in length. 



The total length of the single specimen is 14 inches. 



In the middle and hinder parts of the fish, one inch of the lateral line contains 

 six scales, but in the front these scales overlap one another to a much further extent, 

 so that one inch contains eight or nine scales. 



In the anterior half of each scale of the lateral line is the wide opening of its 

 tube ; the margin of this opening is completed in front by a semicircular notch in the 

 hinder edge of the scale which lies next in front. 



Colour almost black ; head and fining of gill jet-black. 



One specimen, 14 inches long, from 1,005 fathoms in the Gulf of Oman. Station 



354- 



It is notable that N . pluriserialis (Garm.), which this species resembles in many 

 ways, came from 1,010 fathoms in the Gulf of Panama. Registered No. ^^^^. 



