34 



THE AUSTRALIAN MUSEUM. 



number. In all these characters this species* agrees with Traustedt's 

 Kara Sea specimens. 



The critical characteristics of these five allied species may then be 

 arranged as follows : 



Cynthia crinitistellata, n. sp., PL Cyn. IX., figs. 6 7; X., fig. 13 ; 



and XI., figs. 810. 



External appearance. Shape irregular, with knobs, foldings, and 

 corrugations. Attached by posterior end. Apertures not far apart, on 

 anterior end, surrounded by dense tufts of branched spines. Surface 

 uneven, with simple and branched spines, and with a fine down all over. 

 Colour dirty yellow. Size, length 5 cm., breadth 3 cm., thickness 2 cm. 



Test tough and leathery, not thick ; corrugated, and bearing long and 

 short echinated spines all over surface. 



Mantle opaque yellow, moderately muscular. 



Branchial sac with 9 or 10 folds on each side. Internal longitudinal 

 bars distinct, but not wide ; 9 on a fold and 5 in interspace. Occasional 

 very wide transverse vessels with about half-a-dozen narrower between. 



* Which is very probably tlie species Cynthia villosa insufficiently described by 

 Stimpson, from the same locality, in 1865. There was also an Ascidia villosa, which 

 may be a Cynthia, described by Fabricius from Greenland. 



