498 



B 2 . Testes positively stereotropic, elongated (when simple and not 

 massed) in the plane of the body wall; when lobed, the lobes 

 are closely bound together (Figs. Ill and VII). 

 D t . Pharynx without folds. 



Genus Pelonaia Forbes and Goodsir. Type and single 

 species, — P. corrugata F. and G. 

 One U-shaped gonad on each side. 

 Testes only slightly lobed (Fig. VI, 1). 

 Siphonal spinules poorly developed (Fig. XIII, 2). 

 This genus has been placed in a separate family or 

 subfamily. It is however closely related to Gonio- 

 carpa. A reduction in the pharyngeal folds occurs 

 in other Styelids. The position of the intestinal loop 

 to a great extent behind the pharynx is due to the 

 * poor development of the pharynx. The loop is dis- 

 tinctly on the left side of the pharynx as in all 

 Ptychobranchiates. 

 D 2 . Four pharyngeal folds on each side. 

 E t . One gonad on each side. 



Genus Goniocarpa Huntsman. Type, — G. co- 

 riacea (A. and H.) (Styela loveni Hrtmr., 1903). 

 Gonad usually bent forming an angle. 

 Spinules well developed. 



[ycovLà, angle, and xaQTroc fruit, referring to the 

 bent gonad.) 



Section I. 

 Testes much lobed. 

 Test leathery. Short species. 

 Species, — G. coriacea (A. and H.) [with which 

 the following are probably synonymous, *granu- 

 lata (Alder), *northnmbrica (A. andH.), *armata 

 (Lac.-Duth. and Delage), 'placenta (Packard), 

 * loveni (Szlys) and coccodes Hntsmn.], * G. braueri 

 (Mchlsn.), and G. rustica (L.). 



Section II. 

 Testes with few or no lobes. 

 Test gelatinous. Stalked form. 

 Single species, — G. gelatinosa (Traustedt). 

 E 2 . Two or more gonads on each side. 



Genus Botryorchis nov. Type, — B. atlanticus 



