CLASSIFICATIOJ!f OF THE TUKICATA. 609 



B.fiilgurale, Hei-din. (N. Atl.) 



B. rotifera, H. M.-Eclw. (N.W. Eur.) Yellow, with red marks. 



B. 'prostratum, Giard. (N.W. Eur.) Ascidiozooids larger and flatter 



than in B. rotifera. 

 B. clavelina, Giard. (N.W. Eur.) Perfectly transparent. 

 B. insigne, Giard. (N.W. Eur.) Dark brown, marked with yellow and 



violet. 

 5. s^arsa, Alder, (N.W.Eur.) 

 B. pusilla, Alder. (N.W. Eur.) 

 B. radiata, Aid. & Hanc. (N.W. Eur.) Yellow. 

 B. ramulosa. Aid. & Hanc. (N.W. Eur.) Pellucid and cream-colour. 



Saecoboteylloides, von Drasclie, 1883. 



Colony thick and fleshy, often lobed. 



Systems elliptical or elongated, forming branched and some- 

 times anastomosing lines. 



Ascidiozooids cylindrical, with the apertures placed near one 

 another on the anterior eud. 



Test gelatinous, rather solid and greatly thickened; niauy 

 vessels present. 



Branchial sac large and well developed. 



Tentacles 8 to 16 in number. 



Alimentary canal placed alongside the posterior part of the 

 branchial sac. 



Gonads placed on both sides of the body near the posterior end. 



Six species of this genus are known to me, and may be distin- 

 guished as follows : — 



/Tentacles 8 1 



[Tentacles ]6 2 



, f Test opaque white S, sivperbu7n,\.Tir. (Med.) 



[ Test transparent grey 3 



(Colour red-purple ; ascidiozooids 3 mm. long, very close ; 16 rows 

 of stigmata S. fiirjmrcum, n. sp. (Austr.) 

 Colour dull slate-grey; ascidiozooids 2 mm. long, not very close; 14 

 rows of stigmata S. pannosur/i,n.sT^. (Austr.) 



Q /Stomach has ca3cum 8. anceps, n. sp. (Austr.) 



"^ \ No ciecum present 4 



1 Tentacles 8 long and 8 short 8. Wyvillii,'RQ\'Am. (N. Atl.) 

 Tentacles 4 long, 4 medium, and 4 short. 

 8. jacJcsonianum, u. sp. (Austr.) 



Family II. DISTOMID^ {Giard, 1872), Serdm., 1885. 



Colony rounded and massive, rarely incrusting, either sessile 

 or supported upon a long or short peduncle. 

 Systems irregular, inconspicuous or absent. 



