CALIFORNIA ACADEMY OF SCIENCES. 



Ill one speciiueii I found only one spennatlieca, situated in the center of the ventral 

 line, between somites ix and x, but in x. Another specimen had two spermathec;?, 

 one in ix /x, another on the left side, between x and xi. Another had two sperma- 

 thecje betweeen x and xi, one on each side. Another had two spermathecae between 

 ix and x, one in center of median line, and one on the right side, always attached to 

 the intersegmental wall. This arrangement and variability of the spermntheca? 

 reminds us of the spermathee.ie in MicrocluTta, where the number varies on either 

 side; but in other respects there is no similarity between the two. The exterior 

 spermathecal pores are not conspicuous, and not perceptible when viewing the out- 

 side of the body, mounted, for instance, in glycerine. As will be seen, the sperma- 

 theca in this species differs veiy much from those in Deltnnin Troyevl and BenJuoni, 

 in which two species this organ is constant, and furnished with two diverticula each. 

 The spermatheca in DeUania elegans resembles gre.atly in structure a sperm-sac, from 

 which it only difTers in size and in position. It reminds me greatly of the peculiar 

 organ described by me in Ocnetodrilus orcidentalh, where, apparently, the posterior 

 testes have become modified, and assumed the function of spermatheciie, with a dis- 

 tinct and ciliated duct perforating the body-wall. 



The f^permatozoa are always found agglomerated in sphperical masses in the 

 spermatheca, hardly regular enough to be designated as spermatophores. The tails are 

 long, either extending straight ont, or arranged screw-like in the same direction 

 around the sperm-ball. These balls vary greatly in size, some being twice as large as 

 others, but they are always round and apparently globular (fig. 13). 



Ovnry and Oviduct (fig. 9). As usual the ovary is found in xiii. It offers no 

 great peculiarities. It is rather deeply lobed and very large. The oviduct opens in 

 xiv, with its funnel in xiii. The oviducal funnel is very thick, substantial and round, 

 with a circular and very regular outline. The figures (5 and 9) give correctly its 

 outline, but the dejiressed folds have been too distinctly marked. There is no ovisac, 

 and the ovary and oviducts are entirely free. 



Blood vessels. The dorsal vessel emits three pair of hearts in x, xi, xii, and the 

 ventral vessel is forked between somites ix and x. The blood is yellowish-red, more 

 decidedly yellow than red. There are but few blood vessels on the nepliridio-tul)es and 

 none on the nephridio-vesicle. 



The ventral nerve-cord is considerably wider in the posterior part of tlie 

 somites where it emits the customary pair of nerve fibers. In the anterior part 

 where the single septal nerve pair is emitted, the nerve-cord is quite narrow. In 

 Beltania Troyeri the nerve-cord is quite uniform without any nodular enlargements, 

 as wide at the anterior as at the posterior end of the somite. The brain is narrow, 

 slightly curved and the posterior sinus shallow. It is situated in s<»iuite ii (fig. C^). 



