54 



PROCEEDINGS OF THE NATIONAL MUSEUM 



with a range of 8 to 1 6 ; and 79 around the circumference of segment 

 30, with a range of 74 to 84 (table 1). In mature specimens a few 

 setae were usually seen on the ventral surface of the clitellum. The 

 wide range in setal number is due in part to the fact that setae are 

 continually being lost and replaced. 



Prostomium: The small prostomium overhangs the mouth and is 

 epilobous, according to the terminology of Stephenson (1930), in 

 that it is well subdivided from, but with its posterior portion extend- 

 ing into, segment 1. In preserved specimens the prostomium is with- 

 drawn and not easily examined. 



Dorsal pores: In 39 mature specimens collected at Pelham the 

 first dorsal pore appeared on intersegmental fmTow 11/12 and, in all 

 observations made since, this has been found to be a very constant 

 character. Michaelsen (1895, 1899) notes the first dorsal pore on 

 intersegm.ental furrow 12/13, as does Gates (1935). However, Chen 

 (1931, 1933) and Gates (1939) record the first dorsal pore on 11/12. 

 Dorsal pores are present in the dorsal midline at aU intersegmental 

 furrows beginning with 11/12 in the Pelham specimens, although they 

 may be obscured in fuiTows 14/15 and 15/16 by the clitellum. 



It is through the dorsal pores that coelomic fluid is ejected when the 

 worm is uTitated. In P. hupeiensis the peculiarly pungent odor of 

 the coelomic fluid, described by Gates (1935) as being similar to that 

 of "carrots freshly dug," is an important diagnostic character. 



Male reproductive system: The male reproductive system is 

 holandric. Paired testes are situated in segments 10 and 1 1 , attached to 

 the posterior face of septa 9/10 and 10/1 1 close to the ventral nerve cord 

 and directly in front of their corresponding spermiducal funnels. The 

 latter have highly folded, ciliated margins, each passing immediately 

 into a vas deferens in the following segment. Two pairs of large 

 seminal vesicles are located in segments 11 and 12, probably arising as 



Abbreviations used on figures 



ac. gl accessory gland 



amp ampulla 



ant. lo.. anterior loop 



bu buccal chamber 



cae caecum 



c. m circular muscle 



div diverticulum 



d. V dorsal vessel 



e epidermis 



gizz gizzard 



ht heart 



int intestine 



lat. oes. lateral oesophageal 

 V. vessel 



1. gl lymph gland 



1. m longitudinal muscle 



m. s muscle strand 



o ovary 



oes oesophagus 



o. f oviducal funnel 



ph pharynx 



p. gl prostate gland 



s septa 11/12 



s. f spermiducal funnel 



sp spermathecae 



su. i. v.. supraintestinal 

 vessel 



s. v seminal vesicles 



t testis 



t. s testes sacs 



V. d vas deferens 



V. n ventral nerve cord 



V. v ventral vessel 



w. t. s._ wall of testis sac 



