STYELA SULOATULA. 115 



guish this species from the young of 8. tuberosa ; 

 the character of the surface distinguishes it from 

 S. coriacea and S. granulata, to which it is more 

 nearly allied. In a contracted state the test becomes 

 much corrugated, and the apertures then appear large 

 and four-cleft. 



9. Styela granulata (Alder). 



(PL XXXVII, figs. 8 and 9 ; PL XXXIX, figs. 5 and 



(3; PL XLI1, figs- 10 and 11 ; PL XLVIII, fig. 12; 



and figs. 65 and 66 in text.) 



Cynthia granulata ALDER [MS. sp. in Ansted's Channel 

 Isl. (1862), p. 219, and] in Ann. Nat. Hist, (3) XI [1863], 

 p. 163 ; [M. & (i. O. SARS Christianiafjord. Fauna, 

 pt. 2 (1870), p. 103]. 



Body cylindrical when extended, nearly hemi- 

 spherical when contracted, reddish, adhering at the 

 base. Apertures terminal, approximated, slightly 

 tubular, red with a darker red line round the margin. 

 Test (PL XXXVII, figs. 8 and 9) tough, finely sha- 

 greened or granulated, but appearing nearly smooth 

 to the naked eye, yellowish or brownish red. Mantle 

 (PL XXXIX, figs. 5 and 6) crimson above, passing to 

 orange or yellow below. Tentacular filaments linear. 

 Branchial sac (PL XLII, fig. 10) with four folds on 

 each side. 



Length about half an inch. 



Hab. Adhering to shells or to other Ascidians, in 

 moderately deep water. 



ENGLAND. Cullercoats, Northumb. (Alder). Sealiam 

 Harbour (Hodge) and Whitburn (Alder), Durham. 

 Lul worth Cove, Dorset (Jeffreys). Isle of Man (Alder). 



CHANNEL ISLANDS. Guernsey (Alder). 



First record. [Ansted, 1862 ; coll. Alder.] 



This Styela somewhat resembles the last (8. sulcata), 

 and is occasionally associated with it on the test of 

 8. tuberosa. It may, however, be at once distinguished 



