582 PEOr. W. A. HEEDMAN S REVISED 



DendbodoAj J/«cieff3/, 1824. 



Body subcylindrical, attached, not sandy. Apertures minute, 

 on anterior end. 



Test coriaceous. 



Branchial sac with 4 folds on each side. 



Tentacles simple. 



Alimentary canal on left side, stomach grooved, intestinal loop 

 narrow. 



Gonads forming a single branched mass placed on the right* 

 side of the body on the inner surface of the mantle. 



This genus contains the single species Dendrodoa glandaria, 

 MacLeay, from "Winter Island (Arct.). 



Glandtjla, Stimpson, 1852. 

 Body free, globular, sandy. Branchial and atrial apertures 

 both 4-lobed. 



Branchial sac with 4 folds on each side. Stigmata curved and 

 arranged in elliptic groups round centres which are placed in 

 longitudinally-running rows. 

 Dorsal lamina plain-edged. 

 Te?itacles simple. 

 Alimejitary canal on the left side. 



Gonads forming 5 long masses on the right and 3 on the left 

 side. 



This genus, which comes close to Styela, but differs from it in 

 having the stigmata curved, has had the following three species 

 placed in it ; but they require re-examination, and may possibly 

 prove to belong to one and the same species : — 

 G. mollis, Stimpson. (E. N. Am.) 

 G. fibrosa, Stimps. (E. ]V. Am. 

 G. arenicola, Verrill. (E. N. Am.) 



PoLTCAEPA, Heller, 1877. 

 Body attached, usually sessile, rarely pedunculated, sometimes 

 incrusted with sand. Both apertures usually 4-lobed. 

 Test usually coriaceous. 



Branchial sac with 4 folds, or less than 4, on each side. 

 I)o7'sal lamina with a plain margin. 

 Tentacles simple. 



Alimentary canal formiag a wide loop. 

 Meproductive organs in the form of a number of small separate 



* " Left " in MacLeay's description (Tran^ Linn, Sop. vol. xir. p. 548j. as 

 he described the animal in the reversed position. 



