]S"£W SPECIES OF PERICH^TA. 217 



thanks are due to the Director of the British Museum o£ Natural 

 History for the opportunity of examining them, 



Peeich^ta Eloweei, n. sp. 



Three specimens of this worm were collected by a son of Sir W. 

 Plower, at Bukit Timah, Singapore, in some rotting timber. 



They were all in a rather poor state o£ preservation, and indeed 

 one looked as if it had been swallowed by a frog. Of the two 

 which were of use for identification, one measures 120 mm. x 

 4 mm., and consists of 116 segments; the other is slightly 

 smaller. 



In colour they are rich brown, though not very dark, with 

 a violet iridescence and nearly white chaetal rings. The pre- 

 clitellian region is more distinctly purple than the rest ; the 

 clitellum is purplish brown ; the ventral surface of the worm is 

 lighter than the dorsal, as is usually the case. 



The male pores are slit-like, with crenated lips, each on a flat 

 rounded papilla, of a light (in fact nearly white) colour ; there 

 are 10 chsetse between these porophores. No copulatory papillae 

 are present, but one of the " penial ducts " is partially protruded.* 

 There are four pairs of spermathecal pores between segments 

 v./vi., Yi./vii., vii./viii., viii./ix. ; having about 12 chsetse 

 between, as counted in the 8th segment. The first dorsal pore 

 is between segments xii./xiii. 



The clitellum does not entirely cover the usual segments, as it 

 does not reach the intersegmental groove at either end ; there are 

 about a dozen chsetse on the ventral surface of the 16th segment ; 

 there are none on the other clitellar segments. 



The cTicetal ring is not quite complete, being interrupted by a 

 small dorsal gap ; but there is no perceptible ventral gap. 

 I counted 18 cbaetae on segment ii. 

 35 „ „ VI. 



40 „ „ XIII. 



45 ,, „ XXVI. 



The chsetse are rather closer together over the ventral surface 

 than dorsally ; but none are larger than the rest. 



Internal Anatomy. — None of the septa are noticeably thickened ; 

 the gizzard and pair of caeca are normal. 



* I had returned the specimen to the British Museum before I had 

 examined P. Arturi, but from the absence of a muscular bulb I conjecture that 

 there is no " penis." 



