302 



F. ¥. LAIDLAW. 



The general arrangement of the terminal organs is similar to that in P. elegans, and the 

 relative size of the parts is equally great. The vesicula seminalis lies transversely; this is 

 probably owing to displacement. Its lumen, like that of the accessory vesicles, is relatively 

 very small and the walls thick. The vasa deferentia unite before entering the vesicula, which 

 lies transversely in the body possibly owing to displacement. The two accessory vesicles lie 

 closely pressed together, and are bound up in a common sheath of specialized parenchyma. 

 The glandular cells of the dorsal chamber of the antrum are well developed, but there is no 

 secretion present either in the accessory vesicles or ducts. 



The following table records the distribution of known species of this genus : — 



[Note. On a Specimen from Ceylon. 



I take this opportunity of figuring and describing 

 very briefly a tj'jDical Cestoplana obtained by Mr Stanley 

 •Gardiner off the Weligama reef, Ceylon. 



Cestoplana ceylanica sp. n. 



Very closely allied to G. rubrocincta. 



Length about 65 mm., breadth 9 mm. 



Anterior end of the body pointed. Colour (in 

 the spirit specimen) dull gray with traces of a darker 

 margin. 



Fig. 72. Anterior end of Cestoplana ceylanica. 



' Add an undescribed species from Ceylon. 

 ^ Doubtful species. 



' It is possible that under this name more than one 

 species is included by Lang, in fact different authors have 



described species from these three localities as distinct, but 

 their descriptions are insufficient. 

 * See von Plehn [11]. 



