148 PROCEEDINGS OF THE NATIONAL MUSEUM vol. i04 



Stylochidae Prosthiostomidae 



Woodioorthia atlantica Bock, 1913 Prosthiostomum angustum Bock, 1913 



Cryptocelidae Enchiridium periommatum Bock, 1913 



Phenocelis purpurea (Schmarda), 1859 

 Leptoplanidae 



Phylloplana purpurea (Schmarda), 

 1859 



There are two more Schmarda species reported from Jamaica, 

 Leptoplana macrosora and Stylochus dictyotus, the types of which 

 could not be found by Stummer-Traunfels (1933) when reinvestigating 

 the Schmarda material. The colored figures in the Schmarda publi- 

 cation suggest that Stylochus dictyotus is identical with Stylochus 

 megalops. Leptoplana macrosora is probably unrecognizable and the 

 same may be said of Leptoplana sp. recorded from Jamaica by 

 Andrews (1892). 



Therefore 20 recognizable species of polyclads are now known 

 from the West Indies. Seven of these occur on the coast of Florida: 

 Stylochus oculiferus, Phaenocelis purpurea, Notoplana insularis, 

 Gnesioceros floridana, Acerotisa multicelis, Thysanozoon nigrum., and 

 Enchiridium periommatum. These same species occur in the Gulf of 

 Mexico, at least near the Florida coast, but, in fact, the polyclad 

 fauna of the Gulf of Mexico is poorly known. Notoplana ferruginea, 

 Pseudoceros splendidus, and Thysanozoon nigrum are found at 

 Bermuda, and Notoplana insularis, Notoplana ferruginea, and 

 Gnesioceros floridana are probably spread throughout the Caribbean. 

 The available data indicate the existence of a polyclad fauna centering 

 in the West Indies and spreading from there slightly into the 

 Bermudas, more extensively onto the coasts of Florida and into the 

 Caribbean, and slightly into the Gulf of Mexico. 



A surprising feature of the West Indian polyclad fauna is the dearth 

 of the cotylean polyclads of the families Pseudocericlae and Eury- 

 leptidae that are usually a conspicuous element in tropical and sub- 

 tropical waters. In this respect the West Indies are inferior to 

 southern California and the Gulf of California, although having a 

 more southerly location, and also inferior to the Bermudas. 



A further peculiarity of West Indian polyclads is the tendency to 

 an excessive muscularity of the male apparatus, seen in no less than 

 four species: Anandroplana muscularis, A. j'ortoricensis, Notoplana 

 ferruginea, and Crassandros dominicanus. 



A new eiu-yleptid cotylean, Prostheceraeus jloridanus, is described 

 from the Gulf coast of Florida. 



