500 



F 2 . Gonads on both sides of body. 



Gj. Gonads few to many, elongated, placed 

 in a single row on each side. Ducts 

 opening near atrial siphon. 

 Genus Cnemidocarpa Huntsman. Type, 

 — C. joannae (Hrdmn.). 

 Four pharyngeal folds on each side. 

 There are a large number of species, 

 that have been placed in the genus 

 Styela or Tethyum, and that doubtless 

 belong here but the descriptions in most 

 cases are insufficient. There are a number 

 of more or less distinct groups, some 

 of which have been pointed out by Dr. 

 Hart m e y er. In one group of species, 

 containing the type, the surface of the 

 body is smooth and the gonads are 

 rather numerous (5 to 12). In another 

 group, containing C. mollis (Straps.), 

 the surface of the body is coated with 

 sand, etc., and the gonads are less nu- 

 merous (4 to 7). In Tethyum morten- 

 sem'Hartmeyer, which evidently belongs 

 here, there are two gonads on the right 

 side and only one on the left. 

 (•/.yfj(.iiç, spoke of a wheel and '/.aqrvoc, 

 fruit.) 

 G 2 . Gonads numerous, short (Fig. V, 3), 

 scattered (not in a single row). The 

 ducts open toward the atrial aperture. 

 Genus Pandocia Fleming. Type, — 

 *P. conchilega Fleming (probably = 

 Cynthia comatha Alder, according to 

 Hartmeyer, 1908). 

 Four pharyngeal folds on each side. 

 This genus, as defined above, doubtless 

 includes a large number of species that 

 have been placed in the genus Polycarpa 

 or Pandocia , but the descriptions are 

 in most cases insufficient. P. fibrosa 

 (Stimps.) is the only one that I have 

 examined. It is the type (by designa- 



