ZooL.— Vol. II.] EISEN—OLIGOCH/ETA. I93 



Diplocardia singularis Ude, subsp. caroliniana Eisen. 



Plate XIII, Figs. 137-142. 



Diplocardia singularis Ude, subsp. caroliniana Eisen, Zool. Bull. Vol. II, 

 No. 4, 1899. 



Definition. — Color flesh, without pigmentation. Size, 40-50 mm. by 1.5 

 mm. Somites, 64, 9S-136. The prostomium divides somite I about one-half. 

 Dorsal pores, most anterior on the front part of IX. Spermiducal pores in 

 XIX. Spermathecal pores in VII-IX. Prostate pores in XVIII and XX. 

 Oviducal pores in XIV, on a small glandular area. Setae as in the species, 

 but a-b is about twice as long as a-a ; a-b is less than one-half as wide as b-c, 

 all faintly sculptured. No setse a-b in XIX. Penial sets curved, pointed, 

 and ornamented. Spermathecal setae not differentiated. Clitellum ring-like, 

 except in anterior part of XVIII, where it is saddle-shaped, XIII->^ XVIII. 

 Genital zone not much differentiated. Two curved grooves, with the con- 

 vexity turned to the ventral median line. In XVII two large circular areas, like 

 depressed papillae. In XXI two similar areas. In XXII one median oblong 

 area. CEsophagus without calciferous folds. Gizzardsin Vand VI. Sacculated 

 intestine commences in XVII. Dorsal vessel single, with chloragogen cells. 

 Hearts, muscular vessels in X-XII, with chloragogen cells. Meganephridia. 

 Testes in XXI. Sperm-funnels in X and XI, compact. Sperm-sacs, one pair 

 in IX preseptal, one pair in XII postseptal. Oviducts, very large protruding 

 funnels in XIII. Prostates large, tubular, almost straight, one-third as wide 

 as the body-cavity. Spermathecae, three pairs in VII-IX; the anterior pair 

 the smallest; the two posterior pairs the largest. Each of the latter extends 

 through two somites backwards. The diverticle is longitudinally oblong, 

 with a distinct stalk or duct, and divided into several chambers by trabecula. 



Septal formula: — 



VII/VIII, VIII/IX, IX/X, X/XI. 



Habitat. — Raleigh, North Carolina, U. S. A. Found 

 under logs and in rotten wood in swamps in the vicinity of 

 the city. Fifty odd specimens were received alive during 

 the first half of January, 1897, from Messrs. Brimley. 



In the location and number of the various organs this 

 form does not apparently differ from Diplocardia singu- 

 laris Ude, but the size and shape of the spermathecse and 

 prostates, and the form and ornamentation of the penial 

 set£e are so at variance with the description and figures of 

 D. singularis given by Ude that it seems advisable to class- 

 ify the specimens from Raleigh, North Carolina, under a 

 separate subspecies. To the differences referred to above 

 we may also add absence or scarcity of papillae on the cli- 

 tellum, four of which occur in D. singularis. 



