1905.J AND ECmUlUDS OF THE " SKEAT " EXPEBITIOX. 39 



III. Genus Phascolosoma. 



8. Phascolosoma pyriformis, sp. nov. (Plate II. fig. 3.) 



Log. Pulau Biclan, Penang. 



Numerous specimens. 



The expanded animal is pyriform in shape, the introvert being 

 considerably shorter than the body. The skin is thick, without 

 papillfe when seen under the lens ; in most of these specimens 

 the colour is a dirty- white with a slight tinge of very pale green 

 which may be due to the reagent. Some, however, are distinctly 

 reddish-brown {i. e., a lightish copper), and in nearly all it is 

 noticeable that the skin is covered with splashes of white, which 

 just behind the tentacles are aggregated into a broad white 

 ring. 



Internally the most pecidiar chai'acter is that both anvis and 

 nephridia open on the introvert, the anus halfway between its 

 base and the tentacles, the nephridia just in front of its base 

 {v. fig. 3 (lb). The muscle-layers are continuous, and there are 

 two broad and short retractors which arise within the middle 

 third of the body and fuse dii-ectly they meet. The oesophagtis, 

 covered by a contractile vessel with numerous black-tipped 

 diverticula, extends to the extreme hind end of the body (at 

 which point the conti-tictile vessel ceases), and then bends sharply 

 forward dorsal to the intestine to enter the latter at the anterior 

 end of the body ; in its anterior half this j)art of the oesophagus 

 is held in place by three small muscles which converge to be 

 inserted fairly close together in the mid-dorsal line. The in- 

 testine is much, coiled and opens at the anus by means of a rather 

 short rectum ; it is not held down to the hind end of the body, 

 but is attached in front by means of the spindle muscle. The 

 nephridia are about a quarter of the body-length, hardly pig- 

 mented, their anterior portion swollen. 



The papillate bodies consist of («) a low circular papilla, with a 

 wide central opening, on the external body-wall, (6) of the 

 glandular portion, lying rather deep down below the cutis and 

 epidermis, and (c) of a fairly long, more or less straight duct, 

 leading to the external opening {v. figs. 3 6, 3 c). 



lY. Genus CLOEOSIPHo^^ 



9. Cloeosiphon aspergillum Quatrefages. 



Selenka, toyn. cit. p. 126. 



Loc. Pulau Bidan, Penang. 

 One specimen. 



Y. Genus Aspidosiphox. 



10. AsPiDosiPHON STEEXSTRUPii Diesing, 



Selenka, torn. cit. p. 116. 



Loc. Pulau Bidan, Penang. . . . ■ 



One speciuien. 



