10 



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



spines. Our specimen, which is over G 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 

 Cfriasmodus must be removed from the Malacopterygians, 

 while Ponerodon must become a synonym. 



(iii.) Paroneirodes (I. 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 (I. c. p. 212). 



— A Brotuline Ophidiid allied to the 



' Challenger ' Indo- Pacific genus 



Acantkonus, 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 Porogndus. 



(vi.) Scopelengys (L c. p. 302). — 



A Scopelid apparently related to both 



IScopelus and Nanobrachium. 



(vii.) Thaumastomias {ibid. Sept. 



1890, p. 220).— A Stomiatid differing 



from the remarkable genus Mtdacosteus 



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 



3/alacosteus. 



(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 



