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Pentastomids 
(ii) POROCEPHALUS MONILIFORMIS, Diesing. 
Another of Diesing’s species described by him from the lungs of 
Asterophis tigris (Python molurus and Python reticulatus). I have 
described a specimen from the last-named species which was sent me 
from Tring. The Indian Museum specimen is simply registered as 
“ from the mouth of a Python.” 
Owing to the kindness of my friend Mr M. D. Hill of Eton College 
I have recently had the opportunity of examining a larval Porocephalus 
encysted in the walls of the intestine of Nycticebus tardigradus, a new 
host as far as I know for Pentastomids. This lemur has but the one 
species and this is confined to the Oriental region. It is not always easy 
to identify the species of these coiled up, encysted parasites but from 
the number of rings and the general appearance I think the specimen 
also belongs to the species P. vioniliformis. 
(iii) POROCEPHALUS, sp. ? 
This species from an unknown host was so shrunken that it was 
unrecognizable. 
(iv) POROCEPHALUS ICACHUGENSIS, n.sp. 
This is I believe anew species and so characteristic that although an 
encysted and larval form I think it may well be described. 
The animals vary a good deal in size, the larger specimens being 
12 mm. in length, the small 9 mm. The shape of the body is markedly 
club-shaped. The thicker or anterior end of the larger animals is 
3—3'5 mm. from back to front and 3‘5—4 mm. from side to side. The 
body tapers somewhat suddenly and the posterior two-thirds is from 
1—T7 mm. in breadth and a little less in depth. In their cysts the 
animals are all coiled up, like a note of interrogation and the coil is 
always in one plane. (PI. XX, fig. 5.) 
Anteriorly the head bears a pair of well-marked rounded papillae 
which project forward. (PI. XX, figs. 6 ancl 7.) These recall the some¬ 
what similar papillae in P. megastomus, Diesing, but in this last-named 
species there are two others behind the mouth. 
The mouth is small and is placed about the level of the base of the 
inner hooks which are slightly in front of those of the outer hooks. All 
four hooks project rather further than is the case with most Penta¬ 
stomids and they are, as PI. XX, fig. 8 shows, very markedly double. 
This is also the case with P. najae sputatricis, P. heterodontis, P. gracilis 
and other species of Porocephalus. 
