TETHYDH. TETHYZ. 239 
tures acutely emarginated. Height two inches and a half; 
breadth nearly two inches. 
Inhabits the British seas. 
3. ASCIDIA MAMMILIATA. 
Ascidia mammillata, Cuvier, Mém. sur ? Anat. des Moll. 
The integument whitish, cylindric, smooth and mammillated ; 
its apertures roundly emarginated. Height nearly three inches ; 
breadth one inch. 
Inhabits the British seas, not unfrequently. 
4. ASCIDIA COCCINEA. 
Tethys gelatinosa, Bohad, Mar. 131. t. x. f. 3. 
Ascidia gelatinosa, Linn. Syst. Nat. xii. 1087. no. 287. 
The integument cylindric, blood-red, smooth and diaphanous ; 
its apertures acutely acuminated. Height half an inch; breadth 
three-quarters of an inch. 
Inhabits the European and Adriatic seas ; is rather rare, 
5. ASCIDIA GLOBOSA. 
Ascidia globosa, Montagu MSS. 
The integument brown, punctulated with black ; its apertures 
approximating, the upper one with six, the lower one with five 
fimbrize. Size of a nutmeg. 
Inhabits the coast of Devonshire and Kent, on sea-weeds. 
6. Ascrp1A MULLERIANA. 
Ascidia conchilega, Mill. Zool. Dan. i. t. Ixii. f. 4-6; Gmel. 
Syst. Nat. 3124. 
The integument suboval, hyaline, azure-blue ; its apertures 
approximating, acutely emarginated. Size of a small walnut. 
Inhabits the British seas everywhere. 
7. ASCIDIA HEMISPHARICA. 
Ascidia hemispheerica, Montagu MSS. 
The integument hemispheric, red; its aperture approxima- 
ting and acutely emarginated. Height half an inch ; breadth 
three-eighths of an inch. 
Inhabits the coasts of Devonshire, Kent, and Wales, 
