ZooL.— Vol. II.] EISEN—OLIGOCHALTA. 1 75 



The color of alcoholic specimens is grayish with a tint of 

 brown on the dorsal anterior parts, undoubtedly due to pig- 

 ment. According to Professor Smith the color is dark 

 brown in life. 



The tail of the worm is very characteristic. The last few 

 somites are not only much narrower, but are also much 

 shorter than any of the others. In three of the specimens 

 the last seven or eight somites are half as long and a fifth as 

 wide as the somites next anterior. They are of a pale 

 whitish color prominently marked off from the deep gray of 

 the other somites. In the fourth specimen only the last two 

 somites are smaller and whiter. By width of the somite is 

 meant the extension from head to tail; the length is the 

 diameter across the body. These last somites appear as 4f 

 they had been regenerated, but as all the specimens agree, 

 I am inclined to consider this diminution in size a constant 

 character. 



Diplocardia riparia Smith. 



Plate XIII, Figs. 143, 144. 



Diplocardia riparta Smith, Bull. 111. State Lab. Nat. Hist., Vol. IV, 1895, 

 p. 285. 



Definition. — Color brown anteriorly and dorsally, clitellum dull coppery 

 colored. Size 220-250 mm. Somites, 136-157. Prostomium divides somite 

 I by one-half. Dorsal pores, most anterior one on anterior margin of XI, 

 near X/XI. Spermiducal pores in XIX. Spermathecal pores, two pairs in 

 VIII and IX, anterior to setae ab. Prostate pores in XVIII and XX. Ovi- 

 ducal pores in XIV. Setae as in D. communis, no ventral setcc ab in XIX. 

 Distance a-a=b-c; a-b very little larger than c~d. Penial setae in XVIII and 

 XX. Spermathecal sets not differentiated. Clitellum saddle-shaped, in 

 XIII-XVIII. Genital zone, no rectangular ventral zone; a ventral depres- 

 sion in XVII-XXI, deepest in XVIII and XX. A pair of crescent-shaped 

 grooves curved ventrally from center of XVIII-XX. Two papillae very close 

 to median line, between XXI/XX. One median papilla XVI/XVII, one 

 pair papillae XVII/XVIII, one pair papilte XX/XXI, one pair papilla; 

 XVII/XVIII. Gizzards in V, VI. Sacculated intestine commences in XVIII. 

 Dorsal vessel single. Nephridia, meganephridia, a small pair in II. Testes 

 in X and XI. Sperm-funnels in X and XI. Sperm-sacs, one pair preseptal 

 in IX, one pair postseptal in XII. Prostates in XVIII and XX. Sperma- 

 thecae, two pairs in VIII and IX, with a large ear-like diverticle pointing for- 

 ward, which is very prominent and exteriorly slightly racemose. Anterior 



