116 



BRITISH TUNIC ATA. 



by the shagreening of the test, which is best seen when 

 the surface is dry; it then appears covered with minute 

 shining facets. X. gmnuhtta may also be distinguished 

 from 8. sulcata by its shorter tubes and smaller aper- 

 tures. It appears to be pretty-widely distributed on 

 the British coast. 



b.d. 



FIG. 66. Digestive organs (on left) and reproductive organs (on right) 

 of Styela granulata. Magnified, b.d. Biliary duct. 



10. Styela humilis */>. nov. 

 (PI. XXXIX, fig. 7 ; PI. XLVIII, fig. 13.) 



[Cynfltia Iti/mi/ix ALDER MS. sp. in Ansted's Channel Isl. 

 (1862), p. 219.] 



Body elongate, conical, closely covered with fine 

 sand and a few fragments of shells ; adhering by a 

 small base. Apertures wide apart, the branchial pro- 

 duced and terminal, the atrial conical, about three 

 quarters down the body or not far from the base. 

 Test rather thin, set with short hairs or membranous 

 processes of the skin, to which the sand adheres. 

 Tentacular filaments linear. Branchial *<tc with four 



