REPORT ON THE TUNICATA. 289 



greyish colour, while the Ascidiozooids are red, with whitish 

 markings on the anterior end ; the systems are very dis- 

 tinct. 



This species was found in shore pools at Port Erin, on 

 Laminaria cast ashore near Spanish Head, and at low water 

 mark at Bay-ny-Carrickey. It has not been recorded from 

 the neighbourhood before. 



Distoma vitreum, Alder (?). 



Two small specimens of a Distoina, which were collected 

 in a shore pool at Port Erin, either belong to this species or 

 to one which is undescribed. They are of a grey colour, and 

 semi-transparent, but the surface is somewhat incrusted with 

 minute sand-grains. In other characters they agree with 

 Alder's short description. * 



A colony dredged at Port Erin, attached to the inside of 

 a shell, may also possibly belong to this species. It forms 

 several recumbent ovate masses united by a stolon. It is 

 of a pale grey colour, with a good deal of opaque white 

 pigmentation. The Ascidiozooids are small, and, from their 

 structure, evidently belong to the genus Distoma. 



Distoma sp. (?). 

 Some specimens of a Distoma which were dredged near 

 Port Erin, Isle of Man, from a depth of twenty fathoms, are 

 unlike any species with which I am acquainted, and may 

 possibly be new to science. They form small rounded or 

 pyriform masses, of a clear transparent grey colour, and 

 somewhat incrusted with sand. The body of the x\scidiozooid 

 is short, the alimentary canal projecting very little beyond 

 the branchial sac. In other respects the structure agrees 

 with that of the genus Distoma. A more detailed examina- 

 tion of fresh specimens will be necessary before it can be 

 definitely settled whether this is a new species or not. 



*Ann. and Mag. N. H., v. xi, 1863. 

 T 



