16 



BRITISH TUNIC ATA. 



IRELAND. Kilkieraii Bay, Connemara, Gralwaj' 

 (More). 



First record 



The body 

 elongated and 

 slightly to the 

 duced and is 

 tremity it is 



.Hancock, 1870; coll. More, 1869. 



of this very distinct species is much 

 almost cylindrical ; it tapers, however, 

 branchial tube, which is not much pro- 

 exactly terminal. At the inferior ex- 

 a little enlarged or clavate. The test 



FIG. 29. Tentacles of dona fascicularis. Highly magnified. 



(PI. XXII, fig. 1) is so perfectly transparent that the 

 reticulations of the branchial sac are visible through it. 

 The atrial tube is placed a short way down the ventral 

 margin, and is only slightly produced. The lower 

 enlarged extremity is rounded, and for a little way up 

 is covered with numerous, rather long, cylindrical 

 papillae ; the rest of the surface is perfectly smooth and 

 is very soft throughout ; it is quite devoid of colour 

 except at the apertures, which are slightly tinged 

 with yellow, and the viscera impart a yellow hue, 

 particularly to the lower part. The vascular ramifi- 

 cations are confined to the inferior extremity, and 

 penetrate the external papillae. 



The mantle (PI. XXII, figs. 2-4) is excessively 

 delicate, very transparent, and tinged slightly with 



