172 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



though minute spermathecal diverticle, being constant both 

 in position and size, as I afterwards ascertained by examin- 

 ation of another specimen. 



S-perm-sacs. — There are two pairs of sperm-sacs. One 

 pair is preseptal and sHghtly racemose in IX, protruding into 

 the somite from septum IX/X. It is situated laterally and 

 rather ventrally. A pair of strongly racemose sperm-sacs 

 is also found in XII, but these are postseptal, protruding 

 backward into XII from septum XI/XII. These latter 

 sperm-sacs are much larger and much more racemose than 

 those in IX. Hence it will be seen that D. Keyesi even in 

 this respect agrees with the other species of the genus. 



Subgenus Omahania, subgen. nov. 

 Diplocardia (Omahania) verrucosa {Ude). 



Diplocardia verrucosa Ude, Zeitschr. wiss. Zool. Bd. LXI, 1895, p. 133; 

 EiSEN, Zool. Bull., Vol. II, No. 4, 1899. 



Definition.— Color, pink. Size, 65 to 75 mm. by 2.5 to 3 mm. Somites, 

 100 to 125, body round, of even thickness. Prostomium divides somite I by 

 one-half. Dorsal pores, most anterior one VIII/IX (or X/XI). Spermiducal 

 pores on XX. Spermathecal pores on anterior third of somites IX and X, 

 somewhat dorsal to setae d. Prostate pores on XIX and XXI. Oviducal 

 pores interior to setae a; no glandular ridge. Setae sigmoid, very faintly 

 ornamented. Distance d~d more than half the periphery; c-d somewhat 

 greater than a-b; a-a three times, and b-b two and a half times greater than a-b, 

 no setae ab in XX. Penial setae curved, not ornamented. Spermathecal setae 

 not differentiated. Clitellum saddle-shaped, XIII-XVIII. Genital zone a 

 rectangular field from posterior ^ XVIII->^ XXII, extending laterally to 

 center between b-c. Two deep grooves from yi, XIX- >^ XXI, the convexity 

 of which is outwards, except in the center of XX, where it is turned towards 

 the median line; one median papillae on XXII; one pair papillae on XIX in 

 line with setae b\ one pair papillae on XIX and XXI, interior to grooves; one 

 pair papillae exterior to grooves on each of XIX, XXI, XXII (two pairs 

 papilla on each of XIX, XXI, and three papillae on XXII). CEsophagus, no 

 calciferous folds or thickenings. Gizzards in V and VI. Sacculated intestine 

 commences in XVI. Dorsal vessel single. Hearts, three pairs in X, XI, XII. 

 Nephridia, meganephridia, commence in II, pores intersegmental in front of 

 setae d. Testes in X and XL Sperm-funnels in X and XI. Sperm -ducts 

 open in central part of groove in XX. Sperm-sacs, one pair preseptal in IX, 

 one pair postseptal in XII. Oviducts open in front of and interior to setae a. 

 Prostates very thin, even, bent in four folds, confined to one somite each. • 



