No. 4-] JVOI^ TH-A M ERICA N EA R TH WORMS. 1 6 7 



a-a = b-c ; a-b very little larger than c-d. Penial setae, xviii, 

 XX. Spermathecal setae not differentiated (.''). ClitelhtDi saddle- 

 shaped in xiii-xviii. Genital zone, no rectangular ventral zone; 

 a ventral depression 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 papillae xx/xxi, one pair papillae xvii/xviii. Gizzards 

 V, vi. Sacculated intestine commences xviii. Dorsal vessel 

 single. Nephridia, meganephridia, a small pair in ii. Testes 

 in X, xi. Sperm funnels x, xi. Sperm sacs, one pair pre-septal 

 in ix, one pair post-septal in xii. Prostates xviii, xx. Sperma- 

 thecae, two pairs in viii, ix, with a large ear-like diverticulum, 

 which is very prominent and exteriorily slightly racemose. 

 Anterior and posterior spermathecae are of the same size. 

 Habitat. — Havana, banks of Illinois River, Illinois, U. S. A. 



DiPLOCARDIA MiCHAELSENI n. Sp. 



Definition. — Color, flesh. Size, 45 mm. by 2 mm., hardly 

 tapering posteriorly. So7nites, 63. Prostominm divides somite 

 i completely. Dorsal poi'es, most anterior iv/v. Spennidiical 

 pores xix. Spermathecal pores, one pair pre-septal in ix, one 

 pair post-septal and almost central or median in viii. Prostate 

 pores xviii, xx. Ovidncal pores xiv, in front of and anterior to 

 setae a, close together. Setae all ventral ; a-a ^ 3 a-b ; a-a 

 about one-third larger than b-c ; b-c = about 2 a-b. Penial 

 setae present at spermiducal pore. Spermathecal setae present 

 in viii, ix ; setae a and b being differentiated and sculptured. 

 Clitelbim ring-like, dorsally ^vSr-y^ xviii ; ventrally xiv-xvii. 

 Genital zone, a deep central, oval pit in xviii-xx, surrounded by 

 an elevated ridge. A pear-shaped ventral and median papilla 

 in xxi and % xxii, and a similar papilla in }i xxii and xxiii. 

 Grooves between prostate pores are straight. A pair of deep, 

 round pits in posterior part of xvii. No paired papillae. 

 Septa, thickened are : 



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



