1 62 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



There are other reasons why I do not think that Plutel- 

 Itis and Argilophilus are generically connected. Benham's 

 species Plutellus Perrieri possesses only one pair of testes 

 and one pair of sperm-funnels, and the funnels are enclosed 

 with the testes in a special sac. Scrutinizing Perrier's 

 description of his Plutellus heteroporus, it seems to me 

 probable that his species agrees with Benham's in some 

 very important points. May not Perrier have mistaken the 

 sperm-funnel for oviduct and the testes in X for ovaries ? 

 If such is the case, his species would resemble Benham's 

 in having one pair of testes and one pair of funnels, which 

 character I think will be sufficient to relegate the two species 

 to separate genera. In the only other American species, 

 Megascolides americanus Smith, related to these species of 

 Benham and Perrier we find plectonephridia and two pairs 

 of spermathecse. This species is thus undoubtedly more 

 related to the Australian species than to the American ones, 

 and I think Professor Smith is right in referring it to 

 Megascolides. It possesses plectonephridia and two pairs of 

 testes and sperm-funnels. As for Argilophilus, I propose 

 the genus for species with two pairs of testes and funnels 

 and with meganephridia. 



American Species of Plutellincz. 



A. Meganephridia, one pair of testes and one pair of sperm-funnels, more 



than two pairs (four or five) of spermathecse. 



Plutellus Perrier. 



1. Three pairs calciferous glands. 



Plutellus Jieteroporus Perrier. 



2. No calciferous glands. 



Plutellus Perrieri Benham. 



B. Meganephridia, two pairs of testes and two pairs of sperm-funnels, no 



calciferous diverticles. 



Argilophilus Eisen. 



Argilophilus ■marmoratus Eisen. 

 Argilopliilus Jiyalinus, sp. nov. 



C. Plectonephridia, two pairs of testes and two pairs of funnels, no distinct 



calciferous diverticles. 



Megascolides McCoy. 



Megascolides atnericanus Smith. 



