290 LIVERPOOL MARINE BIOLOGY COMMITTEE REPORT. 



Family. — Polyolinid^ . 



Aplidmm fallax, Johnston (?). 

 A specimen apparently belonging to this species was 

 found by Forbes at the Isle of Man, and figured in the 

 British Mollusca (vol. i, pi. A, fig. 1). 



Parascidia forhesiiy Alder. 



Sidnyum turbinatum, Sav., Forbes, Brit. Moll., v. i, p, 14. 



Forbes recorded, in the British Mollusca, Savigny's 

 species Sidnyum turbinatum from the north shore of the 

 Isle of Man, but in the description mentioned that the 

 Ascidiozooids had 8-lobed branchial apertures. This point 

 showed that Forbes' specimen could not be referred to the 

 genus Sidnyum, and therefore Alder very properly trans- 

 ferred it to Parascidia, and gave it the specific name, 

 forhesii. It has apparently not been found since. 



Morchellium argus, Milne-Edwards. 



Amaroucium argus, Milne-Edwards, " Observations," etc., p, 291. 



This species was first described as an Amaroucium by 

 Milne-Edwards, in 1842, and was afterwards placed in a 

 distinct genus by Giard, on account of the areolated or 

 irregularly thickened condition of the stomach wall. 



It is common around the south coast of the Isle of Man, 

 in deep water. It was dredged during August, 1885, off" 

 the Halfway Rock, and Bay Fine, near Port Erin, and ofi" 

 Spanish Head, near Port St. Mary, from depths of fifteen to 

 twenty-five fathoms. The specimens obtained showed a 

 good deal of variation in colour. Some were pale greyish 

 yellow, others orange, and others bright red, and all inter- 

 mediate conditions were found. Many of the larger colonies 

 were of considerable size, and had long peduncles. In some 

 cases the peduncle was entirely covered with an incrusting 

 layer of sand and shell fragments. 



