288 LIVERPOOL MARINE BIOLOGY COMMITTEE REPORT. 



this species. It generally forms small rounded colonies of 

 one or two systems each, which are attached to Algae and 

 Zoophytes ; but one colony of larger size, several centimetres 

 in diameter, and composed of half a dozen systems, was 

 found incrusting the lower surface of a stone in a shore-pool at 

 Port Erin. The other colonies of this species were obtained 

 at Bay-ny-Carrickey, near Port St. Mary, at low tide. 



Botrylloides, sp. (?) 

 A beautiful white Botrylloides, one colony of which was 

 obtained at Port Erin incrusting a specimen of Hydrall- 

 mania falcata, may either be an abnormal specimen of 

 Botrylloides albicans, or may possibly be new to science. 

 The systems in this specimen are so ramified and involved 

 that the Ascidiozooids seem to be scattered quite irregularly 

 through the clear and transparent investing mass. 



Botrylloides leachii, Savigny (?) 

 A small purplish species of Botrylloides, which was found 

 several times in the neighbourhood of Port Erin, Isle of 

 Man, may possibly belong to this species. The test is clear 

 and transparent, with yellowish vessels ; while the Ascidio- 

 zooids are of a pale purple tint, and are small and numerous. 

 The specimens were attached to Algae, near low water mark. 



Family. — DisTOMiDiE. 



Distoma ruhrum, Savigny (?). 

 A species of Distoma forming large rounded colonies is 

 not uncommon at the south end of the Isle of Man attached 

 to Laminaria, Fucus, and other Algae, and occasionally to 

 stones near low water mark. It is not so brilliantly coloured 

 as the specimen figured by Savigny,* and in this respect 

 agrees with colonies collected by Mr. W. Thompson in 

 Belfast Bay. t The Manx specimens have the test of a 



* Memoires, part ii, pi. iii, fig. 1. 

 + See Forbes and Hanley, Brit. Moll., v. i, p. 18. 



