1909.] NATURAL SCIENCES OF PHILADELPHIA. 333 



able identity of his type species with Sphxewdorum flavimi Oersted. 

 Perrier in 1897 proposed Hypephesia for species with simple setae, 

 naming H. gracilis as the type. 



Tievinsen employs Ephcsia to include l^oth typical species with 

 simple setie like E. gracilis Rathke and forms with compound setae 

 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 setae compound, like 

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

 rate the genera on the basis of setae characters, ranging under Ephesia 

 species with simple setae and under Sphcerodorum those with the setae 

 compound. Finally Perrier recognizes the three generic types apparent 

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

 his Ephesia, unfortunateh' applying that name to the E. peripatus 

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

 with simple setae. 



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

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

 distinct tenable generic names are in existence for the two tyi)es with 

 compoimd setae. 



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 Sphaerodoridae have been so 

 variously conceived that it is possible that other generic names have 

 been overlooked. 

 Sphaerodorum papillifer sp. nov. PI. XV. figs, li, 12. 



^Moderately slender, tapering both ways, the greatest width nearer 

 the anterior end, subterete, but somewhat depressed and flattened 

 below. Length of typo 80 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 papillae and without definite appendages, though 

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

 pair of mammilliform papilhi' the palps. Peristomium a simple, not 

 clearly differentiated ring surrounding the mouth and bearing a pair 



