On a new Snake and two new Fishes from Brazil. 265 



enabled me to do, I found in water from the same tank a 

 great quantity of examples of ^olosoma tenehrarum (see 

 Beddard, " Note upon the Green Cells in the Integument of 

 ^oiosoma tenehrarum^'"' Proc. Zool. Soc. 1889, p. 51), and 

 was able therefore to record the presence of this species in 

 England for the first time *. The appearance of ^olosoma 

 tenehrarum in the same water which produced JE. Headleyi 

 suggested to me that I had made a mistake in distinguishing 

 tlie latter form as a distinct species. I have, however, again 

 met with j^. Headleyi and have been able to compare it with 

 j^. tenehrarum ; this comparison establishes, so far as I can 

 see, the justice of separating the two forms. jEolosoma 

 Headleyi is nearly as large a species as ^. tenehrarum — 

 much larger than ^. quaternariuni — but differs from it in 

 having only capilliform seta3 ; the green spots are quite 

 different in colour from those of ^. tenehrarum^ being of a 

 hright green, often with a distinct admixture of blue. The 

 nephridia are as numerous as in jE. tenehrarum^ much more 

 numerous than in ^. varie.gatum^ and they commence in the 

 first setigerous segment. The green cells when treated with 

 iodine do not show the remarkable black precipitation which 

 is so distinctive of j^. tenehraruin ; but, as in that species, 

 they become violet when treated with ammonia. When the 

 worm is subjected to pressure and to the action of acids &c. 

 the contents of the coloured epidermic cells are not expelled 

 in long coiled threads, as in jEolosoma tenehrarum. All the 

 facts appear to point to the distinctness of jEolosoma Headleyi 

 from ^. tenehrarum — at any rate in the present state of our 

 knowledge of this very interesting genus of Oligochoeta. 



XXXIII. — Descriptions of a new Snake and two new Fishes 

 ohtained hy Dr. H. von Hiering in Brazil. By G. A. 

 BOULENGER. 



Elapomorph us trilineatus. 



Rostral as deep as broad, in contact with the anterior angle 

 of the single praifrontal ; internasals meeting by their inner 

 angle ; frontal not quite so long as its distance from the end 



* The occurreBce of this form in the Zoological Gardens only is perhaps 

 hardly sufficient to establish it as a British species. I have, however, 

 since my paper was published received examples from Oxford through 

 the kindness of Mr. U. H. Latter, tutor of Keble College. Prof. W. Hat- 

 chett Jackson informs me that he has ob.^erved an ALolosoma with green 

 spots, which is probably the same. 



