549 



rcnindcd by a comparatively prominent glandular area which extendi 

 vcntrally to b, and encroaches on XVI. The oviducal pores arc small 

 apertures slightly dorsad of b, on XIV. The nephridiopores are 

 distributed in a manner ([uite similar to that described in H. cctcki. 



INTERNAI. CHARACTERS 



The sei)ta VT/VII and XIV/XV are somewhat thickened and 

 VII/VIII-X1II/XI\' more strongly thickened. The calciferous gland 

 has the ordinary lumbricid structure. The esophagus is abruptly 

 doubled in diameter in X, and forms the anterior part of the gland, 

 this gland extending to the middle of XIV, but with gradually de- 

 creasing diameter. The gland has about 60 longitudinal partitions. 

 The typhlosole begins in XX. The principal difference between the 

 structure of the circulatory system and that ordinarily found in the 

 genus is in the relative size of the "hearts" of XI. In all of the speci- 

 mens examined, they are uniformly much smaller than those of so- 

 mites anterior to XI. We have found no such difference in size in 

 other species. Nothing has been noticed in wdiich the structure of 

 the nervous and excretory systems differs from that in related species. 



The spermaries and spermiducal funnels have the usual positions 

 in X and XI, and the terminal parts of the sperm ducts are surrounded 

 in XV by rather large masses of gland cells which encroach somewhat 

 on the cavities of that somite and of XVI. There are two pairs of 

 sperm sacs, one pair in XI and one in XII. The various female re- 

 productive organs have the usual positions and relations except that 

 spermathecrc are entirely lacking. 



Affinities of the tw^o New Species 



In a recent paper. IMichaelsen ('10) has united the genera Biscni- 

 clla, Biscnia, and IJclodrihis, and recognizes only Luuibriciis, Ocfo- 

 lasimn, and Hdodrilus as distinct lumbricid genera. He includes in 

 the subgenus Bimastns of the genus Hdodrilus species having no 

 spermatheCcT. no sperm sacs except in XI and XII, the tuliercula 

 pubertatis indistinct or lacking, and the clitellum not extending pos- 

 terior to XXXII/XXXIII. H. zctcki meets this fourfold require- 

 ment except in the last character, and in this respect it differs much 

 from its most nearly related species; nevertheless, it seems reasonable 

 to assign it to the subgenus Biinastus. 



H. longidncHis is clearly included wnthin the same subgenus, and 

 so closely resembles some of the sjiecies already described as to make 

 it desirable to state the grounds on which it has been thought neces- 

 sary to establish another species. //. (B.) bcddardi (Mich.) has the 



