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 Molosoma tenebrarum (see 
Beddard, ‘‘ Note upon the Green Cells in the Integument of 
AXolosoma tenebrarum,’ 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 Aolosoma 
tenebrarum in the same water which produced 4. Headley 
suggested to me that I had made a mistake in distinguishing 
the latter form as a distinct species. I have, however, again 
met with 4. Headleyi and have been able to compare it with 
44. tenebrarum ; this comparison establishes, so far as I can 
see, the justice of separating the two forms. d¥olosoma 
Headleyi is nearly as large a species as Af, tenebrarum— 
much larger than 4. quaternartum—but differs from it in 
having only capilliform sete; the green spots are quite 
different in colour from those of AZ. tenebrarum, being of a 
bright green, often with a distinct admixture of blue. The 
nephridia are as numerous as in 4. tenebrarum, much more 
numerous than in 4. variegatum, and they commence in the 
Jirst setigerous segment. ‘The green cells when treated with 
iodine do not show the remarkable black precipitation which 
is so distinctive of 4. tenebrarum; 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 Ke. 
the contents of the coloured epidermic cells are not expelled 
in long coiled threads, as in Aolosoma tenebrarum. All the 
facts appear to point to the distinctness of Molosoma Headleyt 
from 4. tenebrarum—at any rate in the present state of our 
knowledge of this very interesting genus of Oligocheta. 
XXXII.— Descriptions of a new Snake and two new Fishes 
obtained by Dr. H. von Lhering in Brazil. By G. A. 
BoOuLENGER. 
Elapomorphus trilineatus. 
Rostral as deep as broad, in contact with the anterior angle 
of the single prefrontal; internasals meeting by their inner 
angle; frontal not quite so long as its distance from the end 
* The occurrence of this form in the Zoological Gardens only is perhaps 
hardly sufticient to establish it as a British species. I have, however, 
since my paper was published received examples from Oxford through 
the kindness of Mr. O. H. Latter, tutor of Keble College. Prof. W. Hat- 
chett Jackson informs me that he has observed an 4olosoma with green 
spots, which is probably the same. 
