36 MR. W, F. LANCHESTER OX THE SIPUXC'ULIBS [Jan. 17, 



Sipunculids. I will do no more here than call attention to the 

 discovery of an Eastern form ( = Physcosoma gaudens, nov.) 

 corresponding rathei' closely to the Western Ph. tveldonii, and to 

 the somewhat • curious position of the anus in the new form 

 Phascolosoina pyriformis. - . 



S I p u X c u L I D A. 

 J I. Genus iSiPUNCULua. 



1. SiPUXCTTLUS CUMAXEXSIS Kef. 



Selenka, Die Sipunculiden (Semper's Eeisen, p. 104). 



Loc. Penang. 



Two specimens of the variety opacus. 



The bodies of these two individuals are much longer, relatively 

 to the introvert, than was stated by Selenka, who wrote " Riissel 

 tingefahr ein Drittel der Korperlange " : hei-e, however, the 

 introvert is only one-sixth of the body-length. The measure- 

 ments for the two specimens are : — 



(rt) Introvert 43 mm., body 253 mm. 

 (6) „ 28 mm., „ 150 mm. 



Probably this diflFerence is due to the different relative con- 

 traction of the two parts of the animal in these as opposed to 

 Selenka's specimens. 



2. SiPUXCULUS AUSTRALIS Kef. 



Selenka, torn. cit. p. 90. 



Loc. Pulau Bidan, Penang. 



Two specimens. 



In the one specimen dissected the ventral retractors arise from 

 three, instead of four or five, muscle-bands, those tliree being the 

 first to the third on each side of the nerve- cord. 



II. Genus Physcosoma. 



3. Physcosoma scolops Sel. & de Man. 



Selenka, torn. cit. p. 75. 



Loc. Pulau Bidan, Penang. 



Numerous individuals. 



In several of these specimens the skin is less transparent, so 

 that the longitudinal muscle-bands do not shine through it ; 

 gradations may be traced, in others, between this and the typical 

 transparent form. 



4. Physcosoma nigrescexs Kef. 



Selenka, toin. cit. p. 72. 



Log. Pulau Bidan, Penang. 



Three large, and one very small, specimens. 



