REPORT ON THE TUNICATA. 303 



from depths of ten to twenty-five fathoms. Styela grossularia 

 was first described by Van Beneden* from the Belgian coast, 

 but it has since been found in many parts of the British 

 seas. It was obtained from a depth of 363 fathoms in the 

 Faroe Channel, N. W. of Scotland, during the cruise of the 

 " Porcupine," in 1869. f It has not been previously recorded 

 from this neighbourhood. 



Polycarpa rustica, Linn. (?) 



Cynthia rustica, Forbes and Hanley, Brit. Moll., v. i, p. 39. 

 Styela rustica, Traustedt, Oversigt, &c , Vid. Medd., &c., Kjobnh. 

 1880, p. 412. 



Large numbers of a small red Ascidian were obtained 



attached to the basal parts of Laminaria and other large 



Algae, on the shore, and in shallow water near Port St. Mary 



and Spanish Head, at the south end of the Isle of Man. In 



all probability they belong to the present species. They 



agree closely in external appearance with the Cynthia rustica 



of British authors, and in all anatomical details with the 



descriptions of Kupff'er, Traustedt, and others, except in 



regard to the reproductive organs. The above-mentioned 



authors both refer to the single tube-like ovaries on each side 



of the body, while in the Manx specimens the genitalia are in 



the form of numerous rounded polycarps. The species 



consequently must belong to the genus Polycarpa, and if 



Kupfi'er and Traustedt are correct in referring their specimens 



with elongated ovarian tubes to the Ascidia rustica of 



Linnaeus, then my specimens ought to be placed in a distinct 



species under the genus Polycarpa. 



Polycarpa comata, Alder. 



Cynthia comata, Alder, Ann. and Mag. N. H., 1863, p. 103. 

 Cynthia ampulla, Forbes and Hanley, Brit. Moll , vol. i, p. 40. 

 Cynthia comata, Kupflfer, Jahresbericht, 1875, p. 217. 

 Styela comata, Traustedt, Oversigt, etc., 1880, p. 414. 



* Recherches s. VEmbryog., etc., des Asc. Simp. 

 t Trans. Roy. Soc, Edin., vol. xxxii, part ii, p. 223. 



