1886.] MR. F. E. BEDDARD ON A LARGE EARTHWORM. 175 



by the clitellum, but to differ from both this and A. obtusus in 

 the position of the male generative pores. The genital setae of 

 the 17th and 19th segments are almost exactly like those of 

 A. utiffulatus, but the prostate glands, as in A. obtusus, are cylindrical 

 coiled tubes and not niultilobate glands as in A. ungulatus ; at the 

 same time the prostate glands in several examples of my species are 

 so closely coiled that they present an appearance which might easily 

 be mistaken for that which has been stated by M. Perrier to I)e 

 characteristic of A. ungulatus ; it is just possible that the condition of 

 the specimen dissected by M. Perrier may be responsible for the lobed 

 appearance of the prostate glands. Another difference between my 

 species and A. ungulatus is in the spermathecse, which can hardly 

 be said to have a diverticulum, and are in segments 8 and 9, not 8 

 and 10. The structures lying between the two spermathecse of 

 each side may, as 1 have already suggested, be identical with that 

 described above, but evidently differ in detail. The most important 

 difference between the species described here by myself and those of 

 M. Perrier is undoubtedly in the position of the male generative 

 pores ; in so many species — in fact in all except A. obtusus, A. verti- 

 cillatus, and A. ungulatus — the male generative pores are upon the 

 17th and 19th segments'. 



EXPLANATION OF PLATE XIX. 



Fig. 1. Acanthodrilus layardi ; anterior region of body, dorscal aspect. 



2. Segments 13-20, from ventral side, to sliow position of female generative 



pores upon 14th, and the male generative pores upon 17th and 19th 

 segments. The ehtellum is indicated by shading. 



3. Genital spionle from segment 8, magnified. 



4. The lower extremity of the same, more highly magnified. 



5. Spermathecse and accessory genital glands : cp, spermathecas ; v, ventral 



blood-vessels giving off branch to the spermatheca ; a corresponding 

 branch is also given off from lateral heart; «, sac containing modified 

 setiB (figs. 3, 4) ; g.b, glandular bodies opening in common with seta 

 sac ; n, glandular tufts of nephridium ; n', duct of nephridium. 



6. Anterior region of body dissected : cp, sperinathecaB ; n, nephridia. 



7. Princinal vascular trunks of anterior region : rf, dorsal vessel ; s«, supra- 



intestinal ; V, ventral ; I, lateral ; h, '■ hearts." 



' Referring to my paper already quoted \ipon the New-Zealand species of 

 the genus, I find that the male generative pores are there stated to be upon the 

 16th and 18th segments. A reexamination of the specimens has convinced me 

 that that statement is wrong, and that they are, as iu the present species, upon 

 the 17th and 19th segments, while the sperinathecae are in the 8th and 9th seg- 

 ments as indicated in the woodcut (P. Z. S. 188.5, fig. 1, p. 815). 



Should the specimens to which the present note relates prove to belong to a 

 distinct species from either of those described by Perrier, I propose to term the 

 species Acanthodrilus layardi. 



