No. 4-] NORTH-AMERICAN EARTHWORMS. 1 69 



xiii-^ xviii, ventrally xiii-^ xxi. Genital zone, a narrow, deep, 

 rectangular depression, deeper than in any of the other species, 

 surrounded by a thick, elevated ridge. Tiibercnla pubertatis 

 in xix-xxi, a pair of papillae in xviii. Septa, thickened are : 



vi/vii, vii/viii, viii/ix, ix/x, x/xi, xi/xii. 



Most anterior septum iii/iv. Oesophagus, no dilations contain- 

 ing calcic concretions. Gizzaj'd v, vi. Sacculated intestine 

 commences in xvii. Dorsal vessel single, thickly covered 

 with chloragogen cells. Hearts x-xii, with chloragogen cells. 

 Nephridia, meganephridia, no coelomic mantle. Testes x, xi. 

 Sperm fiinnels x, xi. Sperm sacs, one pre-septal in ix, one 

 post-septal in xii, both racemose. Oviducts small. Prostates 

 very short and thick, occupying two somites each. Spermathe- 

 cae, with a diverticulum hidden in the wall of the spermathecae, 

 not perceptible except in sections. Anterior spermathecae 

 largest. 



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



DiPLOCARDIA COMMUNIS GaRMAN. 



Definition. — Color, flesh ; clitellum dull yellow or flesh. Size, 

 300 mm. Somites, 123-165. Prostomiimi divides i by one-half. 

 Dorsal pores, most anterior one x/xi. Spermiducal pores, xix. 

 Spermathecal pores, three pairs in vii-ix, in line with a-b. 

 Prostate pores xviii, xx. Ovidiical pores close together in front 

 of and interior to setae a-b. Setae, ventral, a-a slightly larger 

 than b~c, not ornamented ; no setae a-b in xix. Penial setae 

 in xviii, xx, only slightly curved, smooth, one-third longer than 

 ordinary setae. Spermathecal setae not differentiated. Clitel- 

 lum saddle-shaped, xiii-xviii. Genital zone, copulatory papillae : 

 one pair on xvii, one pair xx. Copulatory grooves on xviii-xx, 

 curved towards the ventral median line. With or without a 

 depressed zone. Septa, thickened are : 



vi/vii, vii/viii, viii/ix, ix/x, x/xi. 



Oesophagus, no calciferous folds. Gizzard v, vi. Sacculated 

 intestine commences in xvii, a low typhlosole from xxiii-xl. 



