ENTEROPNEUSTA FROM THE SOUTH PACIFIC, WITH NOTES 

 ON THE WEST INDIAN SPECIES. 



By ARTHUR WILLEY, MA., D.Sc. 

 [With Plates XXVI— XXXII.] 



Not more than five species of Enteropneusta have been described from the South 

 Pacific up to the present time, and of these, no less than four have been definitely 

 made known since the publication, in 1893, of Professor Spengel's Monograph of the 

 group. 



The five species are as follows : — Schizocardium peruvianum Spengel, Ptychodera 

 australiensis Hill 1 , Ptychodera flava Eschscholtz-, Ptychodera hedleyi Hill 3 , and Spengelia 

 porosa Willey. 



In the present contribution I am able to add three new species to this list, namely, 

 Spengelia alba n. sp., Ptychodera ruficollis n. sp., and Ptychodera carnosa n. sp. I also 

 describe two new species of Ptychodera from the West Indies, specimens of which I 

 owe to the kindness of Professor T. H. Morgan (see below p. 288). 



Ptychodera flava was the first Enteropneust ever described, and was obtained from 

 the Rumanzow Group in the Archipelago of the Marshall Islands, and described by 

 Eschscholtz in 1825. The figure of the animal given by Eschscholtz was reproduced 

 by Spengel in his monograph ; and the general character of the species portrayed 

 in this figure seemed to indicate that it was closely similar to the species which I 

 found in great abundance at the Isle of Pines in 1896. But as Eschscholtz's figure did 

 not admit of any detailed comparison with the form from the Isle of Pines, I deemed 

 it advisable to give a provisional name to the latter, viz. Pt. caledonica. 



I was subsequently informed by my friend Mr J. P. Hill that the same species 

 occurs at Funafuti and I thereupon became doubtful as to the value of the name 

 Pt. caledonica. Accordingly in a later publication 4 I stated in a footnote that if the 



1 J. P. Hill (1894), " On a new species of Enteropneusta (Ptychodera australiensis) from the coast of New 

 South Wales," Proc. Linn. Soc. N. S. W. x. (2). 



2 A. Willey (1897), "On Ptychodera flava Eschscholtz," 0. J. M. S. Vol. xl. p. 165. 



J J. P. Hill (1898), " The Enteropneusta of Funafuti," Memoirs Aust. Mas. in. pp. 205 and 335. 

 1 A. Willey (1898), " Spengelia, a new genus of Enteropneusta," Q. J. M. S. Vol. xl. p. 623. 



w. in. 32 



