298 W. B. BENHAM. 



Fig. 16. — Photodrilus. a. Genital system, sp. Sperma- 

 theca. PRO. Prostate, b. Alimentary system. Both diagrams 

 are constructed from the description given by Giard for P. 

 phosphoreus in' Comptes rendus/ 1887. Here the nephridia 

 do not commence till Somite xiv. Their pores are between 

 the outer and inner couple of setse as shown in fig. c, 



Distribution : Europe (France). 



Fig. 17. — Micros col ex. a. Genital system, pro. Prostate. 

 PS. Sac with penial setse. b. Alimentary system. Constructed 

 from Rosa's descriptions of M. modestus in ' Boll. Mus. Zool. 

 ed Anat. Comp. Torino/ ii and iii. Although closely allied to 

 the two preceding genera, the nephridia, as usual, commence 

 far forwards, c, taken from Rosa's woodcut, represents Somites 

 XVI, XVII, XVIII. He does not state that the setse are absent 

 on this somite, but he does not figure them. The male pore 

 is in line with the seta 1. 



Distribution : Italy. 



Fig. 18. — Rhododrilus. a. Genital system, sp. The first 

 of the four spermathecse on one side. pro. Prostate opening 

 independently of the sperm-duct. b. Alimentary system, g. 

 Gizzard, s. Commencement of sacculated intestine, c. Ex- 

 terior of three somites. Diagrams constructed from Beddard's 

 brief diagnosis of R. minutus in * Proc. Zool. Soc.,' 1889, 

 p. 381. 



Distribution: New Zealand. 



