74 BRITISH TUNICATA. 



yellow, placed partly within the intestinal loop and 

 partly above it. 



Diameter half an inch. 



Hal).? 



CHANNEL ISLANDS. Off Ferniain Bay, Guernsey; 

 dredged (Jeffreys fy Norm an). 



First record. Hancock, 1870; cull. Jeffreys & 

 Norman [1865]. 



We have seen only a single individual of this species, 

 and as the internal parts were in a bad state, notwith- 

 standing the fine condition of the test and mantle, not 

 much of the details has been determined. The form 

 of the test (PL XXIX, fig. 5) is pretty-regularly 

 globular, and the smooth transparent area, within 

 which the tubes are placed, is well denned by an 

 abrupt margin ; it is a little elongated, somewhat con- 

 tracted in the centre, with the ends rounded. The 

 tubes are cylindrical, stout, and, though short, longer 

 and much more conspicuous than they are in E. arenosa; 

 they are perfectly hyaline and colourless; and are 

 placed near together, and when fully expanded, as we 

 are informed by Mr. Norman, are almost touching. 



The mantle (PI. XXIX, figs. 6 and 7) is free except 

 at the tubes ; it is very delicate, perfectly transparent, 

 and almost colourless, the tinge of yellow which is per- 

 ceptible being apparently caused by the internal tissues 

 showing through. No radiating muscles are visible at 

 the base of the tubes, nor are muscular fibres observed 

 anywhere else in connection with the mantle. The 

 branchial tube is nearly terminal, the atrial a short 

 way clown the ventral margin ; both are wide, a little 

 produced, and cylindrical. There is a smooth space on 

 each side of the endostyle. 



The alimentary canal forms a single loop, which 

 extends not much more than half way across the body ; 

 a trace of a second loop is caused by the upward turn 

 of the rectum ; the lower portion of the loop, or that 

 next the stomach, enlarges gradually forwards to its 



