CAI.II'lHiNIA ACADKMY dl' SCIKNCKS. 



Ill line >|)tTiiiuii I Iduiid mily inic siicrinatlicca, .sitii;it('(| in ilic rentfr ul' the vi-iiti:il 

 line, liotween somites ix ami x, but in x. Aiiotlicr sjiccinicii li;i(l two sporniatlicca-, 

 OIK' ill ix /x, another on the left aldo, between x and xi. Another had two speinia- 

 tlieea' l)etweeeii x and xi, one on eacli side. Another had two H|)erinalheeie between 

 ix and x, one in center of median line, and one on the rij:;ht side, always attached to 

 tile iiit(isep;mental wall. This arrangeimnt mikI variability of the sperniatheea' 

 reminds us of the spermathecic in Microclneta, where the number varies on either 

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

 spermathceal pores are not eonspienoiis. ami not percept ilile when viewing the out- 

 side of the body, nioiiiitcd, for iiistnncc, in i;lyceriiie. As will be seen, the sperma- 

 thcea in this species differs very nuieli from those in ])eUiinin Troijcri and licnhmni, 

 in wliieh two species this orn;an is constant, and furnished with two diverticula each. 

 The spermatheca in Deitania ek.f/ans resembles greatly in structure a sperm-sac, from 

 which it only differs in size and in position. It reminds rac greatly of the peculiar 

 organ descril)ed l)y nic in Ocnerodrilus occidental^, where, apparently, the posterior 

 testes have become modilied, and assumed the fiiiielion of spermatlicr:e, with a dis- 

 tinct and ciliated duct perforating the body-wall. 



The i^permatozoa are always found agglomerated in sphiierical nia.sses in the 

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

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

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

 others, l)ut lliey are always round and apparently globular (fig. ]'■)). 



Ovary ami Or'nlm-t (fig. !*)• As usual the ovary is foumi in xiii. It ofTers no 

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

 xiv, with its funnel in xiii. The ovidiical funnel is very thick, substantial and loimd. 

 with a circular and very regular outline. The ligures (."> and 0) give correctly its 

 outline, but the depressed folds hsive been too distinctly marked. Tliei'c is no ovisac, 

 and the ovary and oviducts are entirely free. 



Itload rcaxi'lx. The dorsal vessel emits three pairof hearts in x, xi, xii, and the 

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

 decidedly ycdlow than red. There are but few blond Msselsnn the nephridio-tubes and 

 none on the iiepliridio-xcsicle. 



The iiiiliiil lurvc-cord is considerably wider in the posteiioi' part of the 

 somites where it emit-- the ciistoiiinry pair of lu'ive (ilieis. In the iinteiior part 

 where the single sept;il nerve pair is eiiiitte(|, the nerve-cord is ipiite narrow. In 

 Dillan'id 7'nii/fii the neive-cord is (|nile iiniform without any nodular eiilargenienls, 

 as wide at tln' anterior as at the posterior end of the somite. The luain is narrow, 

 slightly curved and the posterior sinus shallow. It is situated in sdinile ii ( lig. (•). 



