268 IMr. W. S. Kent mi a new S2)ecies o/'Sagitta 



c'liaracters, and has now been found attaclicd to a jaw tlio 

 suitaco-ornanuMit of which jwvfectly accords with that of tlio 

 above-mentioned remains. However it may be with lihhoihis, 

 it woidd therefore seem impossible not to adopt the conclusion 

 that all these specimens belong to one and the same fish ; and 

 the tooth proves that they can have nothing to do with lihi- 

 zodus. For this fish, then, so characterized, and which seems 

 to us to be generieally as well as specifically new, we propose 

 the name ArcJiiclitln/s sulcidcns. 



We must add, before concluding this note, that the teeth of 

 our new fish sometimes measure two and a half inches in length 

 and are upwards of an inch wide at the base, and that upwards 

 of a score of specimens of it have occurred at Newshani. It is 

 therefore pretty certain that they never attain the dimensions 

 of those o{ B/ihodus, from which they can always be distin- 

 guished by their rotundity, the total absence of cutting- 

 edges, and the fine striation of the surface, though they are 

 folded at the base in a manner similar to those of that great 

 enigma. 



We may also add that thirteen opercular plates have been 

 found, some being quite perfect and in excellent condition. 

 The scales, too, are not by any means rare in the same loca- 

 lity. The remains, then, of this fish being so abundant, the 

 non-occurrence of the large Ehizodus-tooth. is very significant. 



XXVIII. — On a new Species o/Sagitta /?-om the South Paciixc 

 (S. trieuspidata). By Wm. S. Kent,'F.Z.S., F.R.M.S.,'of 

 the Geological Department, British ]\Iuseum. 



Some months since, Mr. T. J. Moore, the able Conservator of 

 the Free Public ]\[useum, Livci-pool, received from the South 

 Pacific, in company with Jjeptocephali and an infinite number 

 of other oceanic forms (the produce of surface-dredging on the 

 high seas), certain organisms of such a fish-like outward ap- 

 pearance, that tliey were consigned to the hands of a cele- 

 brated ichthyologist for identification. The ])eeuliar armature 

 of their cephalic region plainly indicated, however, that, if 

 fish, they were very aberrant representatives of the class. 



The privilege of examining them having been afforded me, 

 the idea at once suggested itself that they belonged to that in- 

 teresting group, most closely apjiroximating to the Annelida, 

 designated by Professor Huxley the Cha^tognatha, and of 

 which Sufjitta constitutes the single genus. 



Subsequent investigation substantiated the correctness of 

 the inference ])rimarify arrived at, and at the same time de- 



