164 Proceedings of the Royal Irish Academy. 



Habitat — Ireland. Co. Kerry (Glencar) : Co. Wicklow (Bray Head and 

 Devil's Glen) ; Co. Dublin (Montpelier and 

 Lambay) ; Co. Donegal (Milford). 

 Scotland. Pentland Hills ; Lough Gelly, Eife ; Edinburgh. 

 Isle of Man. Port Erin. 

 Distribution — Switzerland ; Denmark. 



Fridericia RatzeH (Eisen). 



? 1897. F. E., Friend in Irish Nat., vol. vi., p. 206. 

 1900. F. r., Michaelsenin Tierreich, x., p. 100. 

 1900. F. Bcdclardi, Bretscher in Eev. Suisse Zool.,p. 29. 

 1904. F. Ratzeli var. Becldardi, Bretscher in Eev Suisse Zool., p. 265. 

 There is considerable uncertainty about the various descriptions of this 

 species. The British specimens which I have examined are most closely related 

 to the variety Beddardi, described by Bretscher (tom. cit.). The length varies 

 from 15-20 mm. The anterior ventral bundles contain 6-8 setfe. The anterior 

 segments each bear several rows of narrow, irregular, granular glands. The 

 clitellum is formed of close-set glands. The coelomic corpuscles are small and 

 spindle-shaped. The brain is convex before and behind. The salivary glands 

 are freely branched. The spermatheca has a wide duct with several small 

 glands near the pore. The ampulla is half as long as the duct. There are 6-10 

 fairly regular oval sessile diverticula attached to the ampulla, each by a broad 

 base. The spermatheca evidently varies considerably. It is usually described 

 as having a long, slender duct, small ampulla, with numerous small, irregular 

 sac-shaped diverticula. 



The sperm-funnel is 2-4 times as long as broad. 

 Eebruary, December. 



Habitat — Ireland. Co. Dublin (Portmarnock ; Kilmashogue ; foot of 

 Montpelier) . 

 Scotland. Edinburgh. 

 Distribution — Norway ; Denmark ; Germany ; Switzerland ; Italy. 



Fridericia hegemon (Vejd.). 



1900. F. /i.,-Michaelsen in Tierreich, x., p. 101. 



1902. F. h., Bretscher in Eev. Suisse Zool., t. x., p. 22. 



1906. F. h., ■ , Kew Bulletin, Add. Ser. v., p. 66. 



The Irish specimens differ from Vejdovsky's (27. p. 60, taf. xii., fig. 1-5) 

 description, and agree with Bretscher's (tom. cit.) Swiss specimens in having 

 not more than 4 setas in a bundle, and in the duct of the nephridium rising 

 at the front end of the postseptal, instead of the posterior end. 



