250 MR. A. E. SHIPLEY ON ENTO-PARASITES. [Apr. 18, 



Larval forms : — 



Fentastomum subcylindricum Diesing. 



Pentastomuni clavatum Wyman. 



Three specimens, the largest measuring 11 cm., were taken from 

 the lungs of a Zamenis nnicosus Boul., a snake which occurs 

 from Transcaspfa and Afghanistan, across Asia, to the sea-board 

 of China and to the Malay Peninsula and Java. In my "Attempt 

 to revise the Family Linguatulidte " (Archiv. Parasit. i. 1898, 

 p. 52) I have given a list of the numerous hosts which harbour 

 this form. 



There were also some encysted larval forms coiled up in pieces 

 of the liver or in fragments of membranous tissue which looked 

 like mesentery. In the relationship of the mouth to the 

 hooks and in the general appearance of the head they i-esemble 

 P. crotali, but they have an unusual number of annuii, quite 

 fifty. These annuli in the Pentastomida are obviously, very 

 variable characters, and they do not correspond with any true 

 segmentation. It has sometimes occurred to me that their 

 number depends upon the closeness of the coil in which the larva 

 lies. These larvfe, at any i-ate, were very closely coiled. 



POROCEPHALUS MONILIFORMIS (Diesing). 



Pentastoma moniliformis Diesing. 



A single specimen, somewhat injured, from Python sp. 



The club-shaped head and the moniliform chai-acter of the 

 segments and the pointed tail were very marked. The number 

 of segments, counting the terminal joint, was 28, thus agreeing 

 with Diesing's figure*. 



POROCEPHALl'S HERPETODRYADOS, n. Sp. 



Diagnosis. — Length averaging about 10 cm., breadth 2*5 to 

 3 mm. in the body, in the head 4" 5 to 5 mm. About 50 annuli. 

 There are no depressions between these, or hardly any ; the body 

 is smooth, and although the segments are quite distinct they pass 

 smoothly into one another like the nodes of an Equisetum. 

 The head is separated from the body by a distinct neck which is 

 faintly annulated, as is the posterior part of the head. The four 

 hooks are in one straight line, and the posterior border of the 

 oval slit-like mouth is on a line with the posterior bolder of the 

 hooks. The hooks are simple, thei-e is no accessory booklet. 

 There are four conspicuous papillae just in front of the hooks. 



The presence of a distinct neck associates this species with 

 P. annulatus Baird and P. tortus Shipley, but the neck is not so 

 distinct from head and body as in the former, or so short as in the 

 latter of these two species. The hooks, which have no accessory 

 booklet, have a well-developed flange as in P. suhuliferus Lckt. 

 and many others. The hooks are strongly curved, and under the 



* Denk. Ak. Wieii, xii. 1856, p. 31. 



