1895.] ME. r. B. BBDDARD ON NEW EABTHWOEMS, 217 



The spermathecae have a single rather large tubular to oval 

 diverticulum. 



Hah. St. 30, Putabla, Valdivia. 



(5) Acanthodrilus bicinctus, n. sp. 



Of this species there were two examples from Pictou Island and 

 two from Juan Island. The two latter were rather larger than the 

 former and showed a slight difference in the penial setae, which 

 will be referred to in due course. 



The length is 42 mm., diameter 3 mm. ; number of segments 80. 

 The larger worm from Juan was 55 mm. in length. 



The colour of the species is a dark purple, passing into an 

 orange-brown on the ventral surface. The colour was darker 

 than in most Amnthodnli. The prostomium is broad, narrower 

 posteriorly where it is continued over the buccal segment for 

 about two-thirds of its length. Posteriorly the prostomium bears 

 a dorsal groove which is continued to the end of the buccal seg- 

 ment, and is apt to produce the impression of the prostomium 

 entirely dividing the buccal segment. 



The ditellum occupies segments xiii.-xvi.: in one specimen it 

 was divided by a median furrow into two halves, each consisting of 

 two segments ; this circumstance suggested the specific name. 



There are median unpaired genital papillae, extending between 

 the ventral setae on segments xx. and xxi. in one individual, and 

 in another on to the two following segments also. 



The gizzard is well developed. 



The reproductive organs are not very different from those of 

 some allied species ; I fancy that the gonads are only one pair of 

 testes, and of course one pair of ovaries, but am not quite certain. 

 In any case there is but a single pair of large racemose sperm-sacs 

 in segment xi., as is so general. 



The spermiducal glands are large and flattened, being coiled 

 several times in one plane ; the t\\o following glands of each side 

 of the body form an almost continuous mass occupying segments 

 xvi.-xx. The narrow muscular duct of the gland arises from 

 about the middle of the coil. It is accompanied by a sac contain- 

 ing two penial setae which are fully mature, and two immature 

 ones. The former are of a particularly bright yellow colour. 

 One is bent like a bow in a regular curve and ends in a sharp 

 point; its distal third is beset with sharp downwardly directed 

 spinelets. The other seta is of quite a different form. To begin 

 with, it is at least quite half as long again as the first and is more 

 flexible ; this appears to be shown by the whip-like curvature of 

 the distal extremity, which is disposed almost in coils. It termi- 

 nates in an obtusely pointed extremity. Less than the distal third 

 of this seta is beset with excessively fine spinelets, much finer than 

 in the other seta. There can be no question that both setae are 

 fully mature and they show a dimorphism. A similar dimorphism 

 has been indicated by myself to exist in Acanthodrilus georgianus. 

 It has also been met with elsewhere. In the specimen from Juan 



