260 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 43. 



are mere swellings; there is nothing in their structure to suggest that 

 they exercise a suctional function. But even if they do not support 

 Mayer's scheme, they do not fit any better in the system proposed by 

 Browne^ and adopted by me^ in which the criterion separating the two 

 subfamilies is the structure of the sense organs, whether vesicles, either 

 external or internal, or clubs; because though allied to Olindiinse, 

 they have free sense clubs. In short, it is intermediate between the 

 two subfamilies. 



Type.—O&i. No. 29365, U.S.N.M., from the locality given. 



1 Hydromedusa?, in Fauna and Flora of the MaJdive and Laccadive Archipelagoes, vol. 2, 1904. 



2 Mem. Mus. ComD. Zool., vol. 37. 1909. 



