Ceylon and the PJiiUppine Islands. 93 



Tiuma (fig. 7). There appear to be no nephridia present, but 

 the poor condition of the specimen does not permit me to 

 speak with certainty. 



The dorsal vessel is united with the ventral by several 

 transverse trunks in the anterior part of the body ; in segments 

 11, 12, and 13 are three large pairs of transverse trunks 

 arising from the supra-intestinal vessel and uniting this with 

 the supra-nervian ; these correspond to the " coeursintestinaux " 

 of Perrier, who has described similar transverse vessels in 

 Urochceta * and in Pontodrilus f. 



Perichceta UouUeti, E. P. 



Perichceta Houlleti, E. Perrier, Nouv. Arch. d. Mus. t. viii. p. 99. 



This species has been recorded by M. Perrier from Calcutta 

 and from Cochin China. Among a large number of earth- 

 worms from Manila which I owe to the kindness of my friend 

 Mr. H. E. Barwell I observed a single specimen evidently 

 referable to the same species. The peculiar form of the copu- 

 latory pouches, unlike that occurring in any other Perichceta^ 

 renders the .identification of my specimen with the species 

 described by M. Perrier a matter of certainty. 



Perichceta j)OstJmma. (PI. II. fig. 7.) 



Perichceta posthuma, Vaillant, Ann. Sci. Nat. 1868. 



Perichceta affinis, E. Perrier, Nouv. Ai'cli. d. Mus. t. viii. p. 106. 



Megascolex affinis, F. E. Beddard, Ann, & Mag. Nat. Hist. 



Dr. Horst has called attention \ to the identity that really 

 exists between Vaillant's species Perichceta posthuma and P. 

 affinis of Perrier ; if his identification be correct, it is obvi- 

 ously necessary to cancel the name P. affinis. 



A large number of examples of a small species of Perichceta 

 from the neighbourhood of Manila evidently belong to this 

 species ; they present at any rate the following points of 

 agreement with the description as given by Perrier : — The 

 male generative apertures, situated on the 18th segment 

 (the second behind the clitellum), are preceded and succeeded 

 by a pair of genital papilla3 on the adjoining segments ; the 

 copulatory pouches are situated in segments 6, 7, 8, 9 ; each 

 consists of an oval sac with a small tubular diverticulum ; the 

 two last pairs of copulatory pouches are situated in the seg- 

 ment which contains the gizzard ; it is evident therefore that 

 this segment, though not divided by a mesentery, is composed 

 of two fused segments. Testes in segments 1 1 and 12 ; a 



* Arch, de Zool. Exp. t. iii. f Ibid. t. is. 



X 'Notes from the Leyden Museum,' vol. v. 



