17i Transactions. — Zoology. 



These I have corrected, and the corrections are indicated by 

 italics: — 



" Body papillose, cylindrical, tapers posteriorly ; pale- 

 brown, tubercles darker. Proboscis nearly as long as the 

 body, and tapering gradually into it ; posteriorly papillose, and 

 coloured like the body ; anteriorly smooth, very pale, freqiiently 

 with some brown blotches ; the anterior end encircled by 

 about 18 to 20 narrow brown raised rings of Iwohlets. Mouth 

 with a dorsal crescent of about 20 short blunt oral tentacles." 



Localities. — I have received specimens of this worm from 

 the following localities, and in considerable numbers from 

 some of these localities, viz. : — Stewart Island : Collected by 

 the late Professor Parker, by Messrs. H. Suter. W. M. 

 Thomson, and E. Jennings. Foveaux Strait: Prom the 

 oyster-beds, collected by Mr. A. Hamilton. Warrington : 

 Collected by myself. Dunedin : Collected by Captain 

 Hutton. Specimens from each lot have been dissected, as 

 well as the " cotype." They all agree in essential characters, 

 of which a detailed account follows : — 



Form of Body .—For descriptive purposes it is convenient 

 to distinguish the body from the proboscis (or introvert), for 

 the latter may be retracted within the former, unless the 

 animal be carefully ansBsthetised. 



(a.) The body is, as usual, cylindrical, and pointed more 

 or less markedly at its posterior end. It is widest in the 

 middle, and somewhat tapered towards the base of the m- 

 trovert. Usually the body is curved to one side, so that the 

 ventral surface is concave. But if a series of specimens be 

 studied this form is departed from in various degrees, owing 

 partly to the different methods of preservation and partly to 

 the different states of contraction of circular and longitudinal 

 muscles at death. Now, as in times past stress has been laid 

 on the form of the body in diagnosing species, it is worth 

 noting one or two of the forms assumed owing to the above 

 cause : The hinder moiety may be more strongly contracted 

 than the anterior moiety, so that the posterior end looks 

 somewhat like a tail ; or the circular muscles at both ends 

 may be more strongly contracted than those of the greater 

 j)art of the body, and a more or less spherical form i-esults ; 

 while at other times the middle of the body is constricted. 

 (See figures.) 



[b.) The cylindrical 2)roboscis, or introvert, when fully 

 extended is much narrower, and usually as long as or even 

 longer, than the body ; but necessarily the proportions vary 

 somewhat according to the condition at death. 



The tentacles are twenty in number, short, finger-shaped, 

 and grooved along their outer — i.e., oral — margin. They are 

 arranged in the manner typical of the genus in a crescent 



