128 BRITISH TUNICATA. 



with small rounded tubercles, inside bright crimson. 

 Mantle opaque, cream-coloured. Tentacular filaments 

 long, slender, linear. The interior of the branchial 

 aperture crimson, and for some distance longitudinally 

 plicated, the lobes forming an operculum below. 

 Branchial sac white, with four folds on each side. 

 Ovaries (PI. XLIV, fig. (3 and fig. 81 in text) orange- 

 coloured, forming a cluster on each side. 



Length half an inch. 



Hal). Deep water, on Modiola vulgaris. 



ENGLAND. Northumberland. 

 First record. Alder & Hancock. 



[Genus 8. STYELOPSIS Traustedt, 1882.] 



[Ascidia (pars) 0. F. MULLER Zool. Danica, I (1788), p. 14. 

 Phallusia (pars) FLEMING Brit. Aiiim. (1828), p. 469. 

 Cynthia (pars) FORBES & HANLEY Brit, Moll. I (1848), p. 39. 

 Styelopsis TRAUSTEDT in Vid. Medcl. Kjobenh. (1882), p. 

 115.] 



[Body globular or cylindrical, attached at the base. 

 Apertures terminal or nearly so, four-cleft. Test tough, 

 usually wrinkled or rugose, rarely smooth. Mantle 

 closely adherent to the test, more or less crimson in 

 colour. Tentacular filaments simple. Branchial sac with 

 a single strong fold near the ventral edge on the left- 

 side, and a few rudimentary folds, one of which may 

 sometimes be clearly seen ; and occasionally with one 

 or two very indistinct folds on the right side. Ovaries 

 on the left side only ; usually tubular, rarely globular. 



The authors recognized that Van Beneden's Asciilia, 

 grossularia ought to form the type of a new genus 

 which they neither named nor described, but for which 

 a space is left in the transcript of their MS. They 

 also referred to their proposed new genus, Alder's 

 < '//iitJiin fjloiiifrata and two new species. Their opinion 

 that these species should form a new genus must have 

 been arrived at between the vears 1863 and 1867, the 



/ J 



