302 LIVERPOOL MARINE BIOLOGY COMMITTEE REPORT. 



dredged off Spanish Head, near Port St. Mary, from a depth 

 of twenty fathoms ; and several were obtained off the Half- 

 way Kock, near Port Erin, from the same depth. The 

 largest specimen is 2*5 cm. in length, and nearly 2 cm. dorso- 

 ventrally. Very much larger specimens are found a little 

 further north on the west coast, at Lamlash Bay, Arran. 



This species has not been recorded hitherto either from 

 the neighbourhood of Liverpool or from the Isle of Man. 



That peculiarly imperfect condition of the internal longi- 

 tudinal bars of some parts of the branchial sac, which I first 

 described in 1880 * in this species and another, and which 

 has been found since in a number of other Ascidians belong- 

 ing to various genera, is seen very well in one of the Manx 

 specimens. 



Family. — C ynthiid^ . 



Styela grossulariay Van Beneden. 



Ascidia grossularia, Van Beneden, Recherches s. VEmhryogen., 

 etc., des Ascid. Simp., p. 61. 



This common and widely diffused species was found in 



abundance during the cruise of the '* Hygena " in the Menai 



Straits, nearly opposite Bangor, and close to the training 



ship " Clio," on May 24th, 1885. The depth was ten 



fathoms, and the bottom muddy. The Ascidians were 



attached to cinders and dead shells, in some cases in great 



profusion. The specimens on the shells were mostly small, f 



and were of the pale depressed blister-like form, but some of 



those on the cinders were large and of a red colour. Some 



of the specimens contained many embryos in various stages 



of development, and completely formed tailed larvae were 



present in the peribranchial cavities. This species was also 



obtained in abundance off Port Erin, off Port St. Mary, and 



near Spanish Head, at the south end of the Isle of Man, 



* *' Notes on British Tunicata," Journ. Linn. Soc, ZooL, vol. xv. , p. 284. 

 t Some of these were very minute, less than 0*5 mm. in diameter, and 

 were evidently very young. 



