STYELA DEPRESSA. 



127 



Plate XXXIX], Branchial sac (PL XLIV, fig. 4) 

 with pretty-stout longitudinal folds, the transverse 

 vessels slender; oral lamina smooth. Reproductive 

 organs (PI. XLIV, fio\ 5) scattered. 



*s \ o / 



[Longest diameter about half an inch.] 



Hab. ? 



CHANNEL ISLANDS. Guernsey; dredged (Norman). 



First record. Alder & Hancock ; coll. Norman. 



Two specimens were obtained ; one attached to the 

 inside of an old shell of Pectunculus glycimerus, the other 

 on the carapace of a crab (Main squinado). 



This species differs from the last principally in the 

 depressed form, the larger surface of attachment, and 

 the shorter fibrils. 



18. Styela northumbrica sp. nov. 



PL XXXIX, fig. 17; PL XLIV, fig. 6; and figs. 79 



and 80 in text.) 



FIG. 80. Eeproductive organs of Styela northumbrica. Magnified. 



Body cylindrical, only slightly contractile, adhering 

 by a narrow base, but with the test sometimes con- 

 siderably extended in an encrusting form. Apertures 

 terminal, approximated, red. Test (PL XXXIX, fig. 17) 

 rather thick, firm, dull red or reddish-brown, covered 



