112 cataliOGUe of the mollusca 



colour, irregularly blotched with purple-brown, and minutely 

 sprinkled with opake white. Branchial aperture small, general 

 aperture moderate. Stars rather far apart, and surrounded with 

 a few large opake yellowish white globular bodies. 



On the under side of stones in pools between tide-marks, Cul- 

 lercoats, rare. — A . H. 



The envelope of this species is thinner than in any other we 

 are acquainted with, and, when removed from the stone, is ex- 

 tremely flaccid. The patches are large, being sometimes 5 inches 

 across. 



132. BOTflYLLOIDES, Milne Edwards. 



1. B. Leachii, Sav. ? 



Botrylloides Leachii, Forb. and Hani. Brit. Moll. i. 23 ? 

 The species we now refer, though with considerable doubt, to 

 Botryllus Leachii of Savigny, is common among the rocks at 

 Cullercoats and Whitley, encrusting the under side of stones in 

 largish patches. The general envelope is brownish, and the in- 

 dividuals are usually of a nearly uniform ochreous yellow, form- 

 ing large brain-like folds. The colour occasionally varies to 

 brick -red, and even to a purplish hue. There may possibly be 

 more than one species included in this, but, hitherto, we have not 

 been able to detect any difference among them excepting in 

 colour. 



2. B. radiata, Aid. and Hanc. 



General envelope yellowish olive, with yellow granules. — 

 Individuals rather small, broadly pear-shaped, pale ochreous 

 yellow or straw colour, spotted with white, and having a paler 

 rim round the branchial aperture, with rays diverging from it 

 and uniting into a disc beyond, giving a petaloid or wheel-like 

 appearance to it. A darkish line runs down the thorax. The 

 systems are arranged in much shorter and more compact folds 

 then in the last; some parts occasionally assuming the appear- 

 ance of a circular arrangement. The common apertures are 

 usually situated at no great distance from each other. 



On the under side of stones, among the rocks at Cullercoats and 

 Whitley, frequent. 



