REPORT ON THE TUNICATA. 293 



know Alder did not afterwards re-describe it. Whether it is 

 our species is difficult to say, as Alder's brief description is 

 confined to the external appearance. I have named this 

 Manx Morchellioides after Mr. Alder. 



Amaroucium proliferumy Milne-Edwards. 

 A few small colonies of this species were obtained at low 

 water on the shore at Bay-ny-Carrickey, near Port St. Mary, 

 but it is not nearly so common a species here as it is further 

 north, in the Clyde district. 



Amaroucium, sp. (?). 

 A large colony of an Amaroucium, differing from all the 

 known British species, was obtained attached to the " roots *' 

 of Laminaria from Spanish Head, near Port St. Mary, Isle 

 of Man. It forms an incrusting mass of moderate thickness, 

 and was of a rose colour when living. The test is grey 

 and semi-transparent, and the Ascidiozooids are large, and 

 irregularly scattered. The branchial aperture is six-lobed, 

 and there is a long atrial languet. The branchial sac is 

 large and well developed. The tentacles are of at least two 

 sizes, placed alternately. The stomach is folded longitudi- 

 nally. I hesitate to describe this form as a new species, as 

 it may possibly be identical with one of the species of 

 Amaroucium described by von Drasche from the Adriatic. 



Family. — Didemnid^. 



Leptoclinum durum, Milne-Edwards. 



Leptoclmum aureum, M.-Edw., Forbes, Brit. Moll, v. i,p. 17 . 



Several small colonies of this species, which is readily 

 distinguished by its yellow colour, were found attached to 

 the "roots" of Laminaria, from near Port St. Mary and 

 Spanish Head, Isle of Man. 



Leptoclinum maculosum, Milne-Edwards. 

 This species is common, chiefly attached to the *' roots " 



