(9 48d) 
XX.—On the Anatomy and Histology of Pleurocheta Moseleyi. By F. E. 
BEDDARD, B.A, New College, Oxford. (Plates XXV. to X XVII.) 
(Read 17th April 1882.) 
Two specimens of the worm which forms the subject of this memoir were 
brought to Professor MosELEy, in 1872, by a coolie trained for the purposes of 
collecting by Dr. Tawairss, F.R.S., the distinguished curator of the Peradeniya 
Gardens at Kandy ; each was found at the bottom of a deep burrow, in com- 
pany with a single ege-case, in the neighbourhood of that town. Professor 
MosELEY entrusted me with them for study and description, and I have to thank 
him for much valuable assistance during the course of my work, which was 
carried on in the Oxford Natural History Museum. 
This earthworm in external characters presents some resemblance .to 
Pericheta leucocycla of ScHMARDA,* and my friend Mr. W. Hatcuett JAcKson 
informs me that its colour when it first arrived from Ceylon agreed perfectly 
with ScHMARDA’s description of P. leuwcocycla, the white line on each segment 
being very noticeable. But its organisation differs to so marked an extent 
from all the other Perichetous worms which have been hitherto studied, that 
I am unable to regard it as really belonging to this group; and, moreover, 
ScHMARDA’S description, except in the matter of the colour, does not in the 
least apply to the species I have studied. His species has no clitellum, 
and consists of 88 segments, each segment being provided with a continuous 
ring of setz; in my species there is a distinct clitellum present, and the 
number of segments is 260, each provided with about 140 sete not arranged 
in a continuous ring, but failmg on the dorsal and on the ventral median line. 
Furthermore, the shape of the sete differs in the two species ; in SCHMARDA’S 
worm the more swollen part is in the centre, while in the species which forms 
the subject of this memoir the more swollen part is in the upper third of the 
seta (cf. figure given by ScHMARDA with Plate XXVI. fig. 13). 
The description given by TEmprLeTont of Megascolexr coeruleus agrees rather 
more closely with the worm I am about to describe, but differs in many 
important particulars ; in Megascolex the circle of setz is not continuous, there 
being left a dorsa) area on which no setz are developed. ‘This description of 
* Soumarpa, Neue wirbellose Thiere. 
+ Proceedings of the Zoological Society, 1844, pp. 89, 90. 
VOL. XXX. PART Ii. 4F 
