[ 493 ] 



XVI. Report on the Vermes {Oligochceta) collected hy the British Ormthologists 

 Union Expedition and the Wollaston Expedition in Butch Neio Guinea. 

 By Dr. L. Cognetti de Maktiis *. 



[Received December 2, 1914: Read llarcli 9, 1915.] 

 (Text-figure 41.) 



Index. 



Systematic : Pa^e 



Pheretima maxima, sp. n 493 



Pheretima (Parapheretima) utahwana, sp. u 494 



IhE Oligochseta collected during the Expedition led by Mr. A. F. R. Wollaston 

 comprise specimens of three species belonging to the oriental genus Pheretima ; two 

 of these three species are new. By the kindness by Prof. F. J. Bell of the British 

 Museum the small collection has been sent to me. 



Pheretima maxima, sp. n. (Text-fig. 41, A.) 



External Characters. — This new species is to be included among the giant-forms 

 of the order Oligochaeta. The specimen examined attains a length of 450 mm., with a 

 diameter of about 20 mm., and consists of 108 segments. Prostomium pro-epilobous, \ ; 

 the segments xi. to xiii. are slightly triannulated. 



Colour grey at the preclitellian region, very dark grey on the clitellum, yellowish 

 grey at the ventral side of the preclitellian tract, violet-grey with more or less wide 

 yellowish-grey setigerous bands at the dorsal side of the same tract. 



Setae in continuous rings ; about 200 setse on segments vi. to x., and about 180 on 

 segments xvii. to xxvi. 



First dorsal pore in the inter-segmental furrow xiii /xiv. 



The clitellum embraces entirely segments xiv. to xvi,, and has no setae. 



Male pores close to the middle ventral line; each pore is surrounded by a grey 

 circular area. Between the male pores there are five setae. Copulatory papilla; are 

 absent. 



Female pores on segment xiv. on a porophore which is surrounded by a circular 

 furrow, from which some short grooves are given off. 



Three pairs of spermathecal pores, invisible from the exterior. These pores lie in 

 the inter-segmental furrows v./vi.-vii./viii. in line with the male pores. 



* Communicated by F. Jeffrey Bell, F.Z.S. 



VOL. XX. — PART XV. No. 2. — July, 1915. 4 a 



