206 CATALOGUE 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. BOTRYLLOIDES, Milne Edwards. 
1. B. Leacuttr, Sav. ? 
Botrylloides Leachit, Forb, and Hanl. Brit. Moll. i. 23 ? 
The species we now refer, though with considerable doubt, to 
Botryllus Leachit 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. raprata, Ald. and Hane. 
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. 
