VOL. II.] Anatomical Notes on Siitroa Alfcstris. 331 



I now discard this view, as I have found one or more pairs ot 



albumen glands in Siitroa alpestris, situated in somite Vlll. In 

 this somite we find two comparatively large glands engaged in the 

 dissepiment between somites VII and VIII, with distinct ducts 

 opening between the somites (Figs. 6, i, 16). 



Glands of somewhat similar construction are found in somite 

 IX in the same relative position as the former, but I have not been 

 able to clearly define their ducts, and cannot judge as to whether 

 they open outwardly or not. In Sidroa rosirata we find ex- 

 actly similar glands, one pair in somite IX. There can be no- 

 doubt but that their nature is identical with that of the glands 

 now described in Sidroa alpestris. That neither of these glands 

 can be identified as testes or ovaries may be considered conclu- 

 sive, as I have found both spermatozoa and egg-cells in various 

 stages of development in different organs, as I have previously 



stated. 



Oviducts. The two goblet-shaped oviducts are found in somite 



X, opening outwardly through a duct and porus in the line between 

 somites X and XL The oviducts are covered with glandulous epi- 

 thelium and the interior funnel-shaped opening is furnished with 

 vibrating ciliee (Fig. 10). These organs are situated in the ventral 

 side of the somite quite close to the spermiducal atrium, almost 



touching the efferent ducts. 



Nephridia. The excretory system (formerly so-called segmental 

 organs) or nephridia, are found in somities V, VI, VII, and in XII 

 and following. The interior head is large, brown and glandular, 

 furnished with a small projection, protruding through the dissepi- 

 ment of the anterior somite, and forming the interior opening of 



the organ. 



Set.c The set^ are quite similar to those of Sidroa rostrata as 



well as to those of Rliynchehnis limosella. There are four couples 

 in every somite. In each couple are found two fully developed 

 set^ and two smaller, partly developed (Fig. 5). The central swell- 

 ing is situated at the anterior third of the spine. 



The ^%% capsules of Sidroa alpestris resemble those of Rhynchel- 

 mis more than they do those of Sidroa rosirata. Their shape is 

 almost globular with the free end pointed and bent (Fig. 14). The 

 central figure shows the egg capsule in natural size. 



