1909.] NATURAL SCIENCES OF PHILADELPHIA. 333 



able identity of his type species with Sphcerodorum flavum Oersted. 

 Perrier in 1897 proposed Hypephesia for species with simple seta?, 

 naming H. gracilis as the type. 



Levinsen employs Ephesia to include both typical species with 

 simple seta? like E. gracilis Rathke and forms with compound seta? 

 like E. peripatus Claparede (non Johnston), while Sphcerodorum is 

 retained for those species which bear several series of spherical append- 

 ages with granular contents and which have the setse compound, like 

 S. claparedii Greeff. St. Joseph, on the other hand, prefers to sepa- 

 rate the genera on the basis of seta? characters, ranging under Ephesia 

 species with simple seta? and under Sphcerodorum those with the setse 

 compound. Finally Perrier recognizes the three generic types apparent 

 in the family, retains Levinsen's application of Sphcerodorum but divides 

 his Ephesia, unfortunately applying that name to the E. peripatus 

 group and giving a new name {Hypephesia) to the typical E. gracilis 

 with simple setse. 



It is evident, therefore, that Sphcerodorum is the proper name for 

 the papillated forms with simple setse only, and, so far as I am aware, no 

 distinct tenable generic names are in existence for the two types with 

 compound setse. 



The present collection includes a species of each of the three types 

 known in the family, but all are provisionally placed in the genus 

 Sphcerodorum, a proceeding that may be justified because the known 

 number of species is so small that no confusion will result from plac- 

 ing all in a single genus, because increased knowledge of the species of 

 the family may make known forms possessing intermediate characters, 

 and because the relationships of the Sphserodorida? have been so 

 variously conceived that it is possible that other generic names have 

 been overlooked. 

 Sphaerodorum papillifer sp. nov. PL XV, tigs. 11, 12. 



Moderately slender, tapering both ways, the greatest width nearer 

 the anterior end, subterete, but somewhat depressed and flattened 

 below. Length of type 30 mm. ; maximum diameter at end of anterior 

 two-fifths 1 mm.; segments 102. Other specimens one or two milli- 

 meters shorter. 



Anterior end blunt, the prostomium and peristomium retracted and 

 difficult to distinguish, the former a very short, simple, slightly domed 

 lobe studded with papilla? and without definite appendages, though 

 three papillse longer than the others may represent the tentacles and a 

 pair of mammilliform papillse the palps. Peristomium a simple, not 

 clearly differentiated ring surrounding the mouth and bearing a pair 



