10 



Messrs. J. Wood-Mason and A. Alcock on 



spines. Our specimen, which is over 6 inches long and in good 

 preservation, was examined in the fresh state, and if it should 

 prove to be identical with Chiasmodus, we consider that 

 Chiasmodus must be removed from the Malacoptevygians, 

 while Ponerodon must become a synonym. 



(iii.) Paroneirodes [1. c. p. 206). — A Pediculate with the 

 spinous dorsal fin reduced to two 

 (luminiferous) cephalic tentacles, and 

 hardly differing from the Arctic 

 Oneirodes. 



(iv.) Tauredophidium [l. c. p. 212). 

 — A Brotuline Ophidiid allied to tlie 

 * Challenger ' Indo-Pacific genus 

 Acanthonusj but having the eyes re- 

 duced to hidden rudiments. 



(v.) Dermatorus {ibid. Oct. 1890, 

 p. 298). — A Brotuline Ophidiid with 

 close affinities to the wide-ranging 

 deep-sea form Porogadus. 



(vi.) Scopelengys {I. c. p. 302). — 

 A Scopelid apparently related to both 

 (Scopelus and Nayiobrachium. '#:? 



(vii.) Thaumastomias [ibid. Sept. 

 1890, p. 220). — A Stomiatid differing 

 from the remarkable genus il/a^acostews 

 only in some details of dentition, in x 

 the forward position of the ventral ^''' 

 fins, and in the complete absence 

 of pectoral fins. The curious hyo- 

 mental muscular band, which allows 

 the lower jaw to be turned completely 

 backwards over the hyper-extended 

 head, is as well developed as it is in 

 Malacosteus, 



(viii.) Narcetes {ibid, Oct. 1890, 

 p. 305). — An Alepocephalid very 

 nearly allied to Bathytroctes, from 

 which it differs most conspicuously in 

 the pluriserialarrangement of the teeth 

 in the jaws. 



(x.) Aulastomatomorpha [I.e. p. 307) . 

 — A most remarkable Alepocephalid, 

 differing from all other genera of 

 its own family in having the pseudo- 

 branchiae quite rudimentary and the 

 bones of the head prolonged into a 



