96 TKANSACTIONS LIVEEPOOL BIOLOGICAL SOCIETY. 



DoTopygus poricauda, Brady. (PL XVIII, fig. 1.) 

 Length 2.50 mm. One specimen of this species was 

 amongst several of the last preceding taken from the 

 branchial sac oi Ascidia pleheia. 



Doropygics gibber, Thorell. (PI. XVIII, fig. 2.) 

 Length 3.20 mm. Found in the branchial sac of 

 Ascidia plebeia dredged from the " Hyaena " in 1890. 

 Botachus cylindratus, Thorell. (PI. XVIII, fig. 3.) 

 Length 1.75 mm. Found by Professor Herdman in 

 the branchial sacs of Ascidia mentula and Ascidia plebeia, 

 from the Isle of Man. 



Thorell and so far as I know all subsequent observers 

 have failed to find the male of this species. In each of 

 the several ascidians in which the females were found were 

 a few minute specimens which generally correspond to 

 the males of other species and are evidently the male of 

 Botachus cylindratus. (Fig. 3. a.) Prof Herdman tells 

 me that they were in appearance like minute commas 

 attached to the inner folds of the branchial sac of the 

 Ascidian, and from their minute size and very tenacious 

 hold might easily be overlooked. 



Ascidicola rosea, Thorell. (PL XVIII, fig. 4.) 

 Length 3.75 mm. Several specimens of this species 

 have been found in the branchial sacs of Ascidians dredged 

 off the Isle of Man. 



NotopteropJiorus papilio, Hesse. (PL XVIII, figs. 5, 6.) 

 A few specimens of each, male and female of this most 

 remarkable and beautiful Copepod were found in Ascidians 

 dredged in Garwick Bay, Isle of Man by Prof. Herdman. 

 The female is described by Brady (Copepoda of British 

 Islands, Eay Society, Vol. I, p. 142) from Hesse's first 

 memoir in which no mention is made of the male. It was 

 subsequently however found by him and briefly described 

 in a later paper but not figured. It is about 2 mm. in 

 length, the female measuring about double that size. 



