NO. 2174. EARTHWORMS OF THE FAMILY LUMBRICIDAE— SMITH. l75 



One specimen, collected near Manhattan, Kansas, by Dr. P. S. 

 Welch April 2, 1914. 



Eolotype.—C2it. No. 16782, U.S.N.M. 



The specimen was received in living condition. In normal loco- 

 motion it had a length, when extended, of 14 cm. Its diameter, 

 anterior to the clitellmn, was 0.5 cm. and posteriorly 0.4 cm. 

 When strongly contracted the length was 8 cm. and the maximum 

 diameter, 0.7 cm. The worm was very pale in color, in comparison 

 with most species of Bimastus, and the posterior six somites were 

 almost white from contained matter. 



The specimen was not at the height of sexual activity when killed, 

 and the cliteUum is not as strongly developed as it might be, but 

 there is a considerable development on the ventral surface of 29-33. 

 The oviducal pores have not been located, as the oviduct, which is 

 very imperfectly developed, can be traced only to the wall and not 

 through it. The gonads and their ducts have the ordinary locations 

 and relations. 



This species closely resembles E. zeteJci in size and the posterior 

 position of the clitellum', but differs from it in several respects. The 

 chtellum is two somites further anteriad and is developed on the 

 ventral side of a part of its somites, which is not true of the latter 

 species. The difference in the thickening of the septa is very marked. 

 In H. zeteki, septum 14/15 is miiformly one of the two thickest septa 

 of aU; while in H. welcM, it is very tliin. The septa of the latter 

 species which are most strongly thickened, are in H. zetehi, only 

 moderately thickened. The difference in the number of longitudmal 

 partitions m the calciferous gland, of which there are 60-64 in H. 

 zetelci and in H. welcM but about 40, is too great to be a mere indi- 

 vidual variation in the same species. Finally there is a marked dif- 

 ference in coloration. 



H. welchi is a soil species and thus far is known only from tlie type 

 locality. 



HELODRILUS (BIMASTUS) ZETEKI Smith and Gittins. 



HelodrUiis {Bimastus) zeteki Smith and Gittins, 1915:545. 



Length, 10-14 cm. Maximum diameter, 0.5-0.65 cm, at the cli- 

 tellum. Color of antero-dorsal part, pxu-phsh-brown. Somites, 100- 

 142; in complete specimens, the number usually exceeds 130. Pro- 

 stomium, epilobic J-^. Setae, closely paired; anterior to the 

 chtellum, aa: ab:hc:cd: dd = Q: 1:5: 1:20; posterior to the clitellum, be 

 is relatively somewhat greater and dd somewhat less. Chtellum on 

 27-37 and extends ventrad far enough to include the ventral setae 

 on 30-36. Tubercula pubertatis are entirely lacking. First dorsal 

 pore on 5/6. Spermiducal pores on 15, slightly dorsad of 6. Ovi- 

 ducal pores on 14, shghtly dorsad of h. Septa 6/7-12/13 are consid- 



