Benham. — Further Notes on the Sipunculids of N.Z. 301 



Art. XXII. — Further Notes on the Sipunculids of New Zealand. 



By W. B. Benham, D.Sc, M.A., F.Z.S., &c, Professor of 



Biology in the University of Otago. 



[Bead before the Otago Institvie, 8th November, 1904.] 



Plates XV. and XVI. 



During the present year I have received specimens of two new 



species of Sipunculids, each representing a distinct genus not 



hitherto recorded from our coastal waters ; and, in the absence 



of the requisite literature whereby to compare these with species 



described from elsewhere, I propose to give new names to them 



for the purpose, at any rate, of reference. 



Phascolosoma,* Leuckart. 

 P. novae-zealandiae, n. sp. 



A specimen was removed from the stomach of the dog-fish 

 Mustelus antarcticus, which was being dissected in the Biological 

 Laboratory. f The Sipunculid was partly macerated, but not 

 so much as to prevent a study of its anatomy, sufficient, I 

 believe, to characterize it. 



The body-wall had been torn (by the shark's teeth, perhaps), 

 and the skin had separated from the muscular coats, which, 

 together with the viscera, protruded through the rupture. 



Colour. — The skin is pale-yellowish ; the posterior end and 

 the introvert are pale-brown, probably darker in life. 



Dimensions. — The total length of the skin is 310 mm., of 

 which the introvert measures 75 mm. ; the diameter of the body 

 was about 10 mm. ; and the base of the introvert about 4 mm. 

 (Plate XV., fig. 1). These measurements are only approxi- 

 mate : in the first place the skin was softened and undoubtedly 

 more extended than if it had been preserved in the usual manner ; 

 again, the skin was flattened so that the diameter had to be 

 estimated. 



General Description. 



The skin is rough, with small brown tubercles and papillae 

 scattered more ot less uniformly over the whole body and intro- 

 vert (Plate XVI., fig. 8) ; but they are rather more densely 

 arranged in the latter region, and also at the hinder end of the 



* See my article in vol. xxxvi. of the Trans. N.Z. Inst., p. 172. The 

 worm named by Hutton Phascolosoma annidatum belongs to the genus 

 Physcosoma, as denned by Selenka. 



t At the same time and from the same viscus a species of Echiurus 

 was found which differs from E. novce-zealandice, Dendy, in having two 

 circles of hooks at the hinder end ; but its internal organs were absent, 

 so that no means of identification were to hand. 



