204 CATALOGUE OF THE MOLLUSCA 
Our specimens are paler than those described by M. Milne 
Edwards, being of an ochreous yellow, with only a tinge .of 
orange at the sides. The mass frequently forms a cluster of dif- 
ferent sized flattened balls. The general apertures, irregularly 
disposed over the surface, are large and prominent. 
130. LEPTOCLINUM, Milne Edwards. 
1. L. puncratum, Lorbes. 
Leptoclinum punctatum, Forb. and Hanl. Brit. Moll. i. 18. 
On the under side of stones between tide-marks, Cullercoats 
and Whitley, not uncommon. 
131. BOTRYLLUS, Geriner. 
1. B. Scutossert, Pallas. 
Botryllus Schlossert, Forb. and Hanl. Brit. Moll. i. 19, t. A, 
8 
Incrusting the under side of stones, and on the stems of the 
larger Fuci, between tide-marks and a little beyond, common. 
This species may usually be known by a red spot on the thorax 
of each individual composing the stars, though in one or two in- 
stances within our knowledge it has been wanting. The general 
envelope is thick and rather tough. 
2. B. rusens, Ald. and Hane. 
General envelope thin and transparent, dull brown, with nu- 
merous opake yellow granules. Individuals forming circles, or 
stars, of from four to fifteen, generally averaging seven or eight ; 
their colour is various shades of red, from reddish-yellow to dark 
brick-red: there is usually a circle of dark red round the 
branchial aperture, and at a little distance from it, and a streak 
of the same down the centre of the thorax ; the remainder of 
the body is pale red or yellowish, thickly sprinkled with opake 
yellowish-white spots. General aperture of each system, rather 
small. ‘The stars are smaller, and not so closely set as in the 
last species. 
On the under side of stones between tide-marks, Cullercoats, 
frequent. 
We have occasionally seen the central red line of the body so 
