592 RITTER. 



irregularly over the area to the left of the row of large ones 

 (PI. XX., Fig. 19). _ 



Intestine : Forming a wide loop on the left side of the body ; 

 oesophageal opening about midway on the dorsal line of the 

 branchial sac. 



Reproductive Glands : Situated on both sides of the body, 

 very voluminous, particularly on the left side in the intestinal 

 loop. 



The collection contains but a single specimen of this magnifi- 

 cent species, so the study of it has been less complete than could 

 be desired. (For comparison with other species, see discussion 

 following description of the next species.) 



Cynthia deani n. sp. 

 (PI. XVIII. , Figs. 2 and 3; and PI. XIX., Figs 21, 22, and 23.) 



General Appearance : Body oval, tapering gradually tow^ard 

 the posterior end, where it is attached by a clump of root-like 

 processes of the test. Siphons placed at the anterior end, usu- 

 ally prominent, though the branchial is sometimes on a level 

 with the body, apparently owing to contraction. Branchial 

 siphon four-lobed, bent over so that the orifice looks ventrad ; 

 atrial siphon two-lobed, directed straight forward ; color of 

 specimens preserved in formalin, a dull white, or light gray, the 

 anterior part, and especially the siphons, tinged with orange-red. 



Test : Thin, coriaceous ; in young specimens almost trans- 

 parent ; covered with papillae, each bearing a number of short 

 spines which, in the youngest (smallest) specimens, are regularly 

 arranged in circles, with a larger spine in the center. This reg- 

 ular arrangement disappears in older specimens. The spines 

 imparting to the test a harsh feeling (PI. XIX., Fig. 21). 



Mantle : Thin, muscles well developed, especially the longi- 

 tudinal ones. 



Branchial Sac : Nine folds on each side in well developed 

 specimens, eight of them strong, the ones next the endostyle on 

 each side weak, sometimes disappearing before reaching the an- 

 terior end of the sac ; six to ten bars on the folds, usually only 



