CLAVE LINA CORRUGATA. 155 



3. Clavelina corrugata sp. uoi\ 

 (Plate XLIX, fig. 3.) 



Body cylindrical, slightly spelling in the thoracic 

 portion, which forms about a third of the whole length. 

 Thorax nearly as broad as long, the opaque lines of a 

 pinkish colour, the dorsal one much curved. Test 

 sub-diaphanous, colourless, strongly corrugated with 

 irregular transverse wrinkles. Branchial sac with 

 fourteen or fifteen rows of meshes. Peduncle rather 

 thick. 



Length half to three-quarters of an inch. 



Halt. Low water-mark, on stones (Alder). 



ENGLAND.- -Torbay (Alder), and Ilfracombe (HincJcs), 

 Devon. 

 First record. Alder & Hancock. 



Genus 12. PEROPHGRA Wiegmann, 1835. 



[Ascidia LISTER in Phil. Trans. 1834, p. 378.] 

 Perophora WIEGMANN Archiv f . Naturgesch. 1835 [I. p. 309J ; 

 FORBES & HANLEY Brit. Moll. I [1848], p. 28; GOSSE 

 Man. Marine Zool. II [1856], p. 35; WOODWARD Man. 

 Moll. [1856], p. 341. 



Animal orbicular or sub-quadrate, compressed at 

 the sides and united by a short peduncle to a creeping, 

 tubular fibre, common to several individuals ; without 

 opaque white or coloured lines. Test united to mantle. 

 Thorax and abdomen not distinct, the intestine being- 

 placed at the right side of the branchial sac. Aper- 

 tures plain or indistinctly divided into four segments ; 

 without ocelli. 



We have never had an opportunity of examining 

 this interesting form in a living state ; but as in pre- 

 served specimens its transparency is scarcely at all 

 impaired, it is not difficult to investigate its internal 

 organization by transmitted light, even in this state, 

 with the exception of the circulatory apparatus, which 



