1 82 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



there are neither distinct cells nor nuclei. The branching 

 of the lumen is more simple and regular in D. Michaeheni 

 than in D. Udei. 



Vascular System. — I find muscular connecting vessels 

 or hearts in X and XI only. There is no supraintestinal 

 dilatation of the dorsal vessel, as in some other species. 

 The dorsal vessel appears to be single. 



Intestine. — The gizzards are very short and thick and the 

 connection between them is not thin, being about one-third 

 as wide as the widest part. (Esophagus is straight. Tubu- 

 lar intestine is straight, slightly and gradually widening 

 posteriorly. In XIV and XV we find the most character- 

 istic part of the intestine. It consists of an oblong thick 

 glandular crop of the same general structure as the one I 

 have previously described in Pontodrilus Michaeheni . The 

 crop consists of a thick glandular layer of cells which 

 appears between the inner epithelium and the muscular 

 layer. This layer consists of a great number of small 

 cubical cells without any apparent ducts. But unlike 

 Pontodrilus Michaeheni, no vascular blood loops are found 

 penetrating the cell-layer, which appears homogeneous 

 throughout. The part of the tubular intestine situated 

 between the crop and the sacculated intestine, that is, from 

 the posterior one-third of XV to the beginning of XVII, is 

 strongly ciliated. The sacculated intestine is only very 

 slightly wider than the tubular intestine. 



Diplocardia Udei Eisen. 



Plate XI, Fig. 117; Plate XIII, Figs. i45-i54- 



Diplocardia Udei Eisen, Zool. Bu)]. Vol. II, No. 4, 1899. 



Definition.— Color flesh, without any pigment; an even tint all around the 

 body. Size, 70-90 mm. by 2 mm. at the widest part. Somites, 200-220. 

 Prostomium divides somite I about two-thirds. Dorsal pores, most anterior 

 one in anterior part of XI. Spermiducal pores in XIX. Spermathecal pores, 

 two pairs, in front of setae b on anterior part of VIII and IX. Prostate pores 

 in XVI 11 and XX. Oviducal pore in XIV. Setae: a-a =3 rt-6; a-a slightly 

 smaller than b-c; b-c=4 a-b (about); c-d not quite twice as wide as a-b; d-d 



