52 HENRY H. LANE. 



next to the surface is dense and without important sinuses. The 

 outlines of the cells are very indistinct, but the nuclei are alto- 

 gether similar to those of the ovaries previously described. 



The ovary of C approaches more nearly to the condition of A 

 than has any of the others ; but it differs very characteristically, 

 since in many places it contains " nests " of ova much more con- 

 spicuous than any seen in A, while the largest ova in this speci- 

 men are larger than those in A. The ovarian structure itself, 

 while evidently of the same character as that of A, does not con- 

 tain quite so many lymph-spaces, and the walls of the sinuses are 

 somewhat thicker and denser. 



The ovary of B is almost exactly in the same stage as that of 

 A. It differs from C in that the egg-nests have given place to 

 single ova of considerable size and greater development than 

 most of those in the latter. 



It will be noted that the " nests " of ova are conspicuous in 

 Lucifuga, though inconspicuous or lacking in the specimens of 

 Stygicola examined. Whether this is a constant distinction can 

 only be determined by the examination of more material than I 

 have in hand. 



VIII. BLOOD SUPPLY TO THE OVARY. 



A small artery, with a diameter, in different ovaries, of 20 to 

 75 fjt, enters each horn of the ovary and runs back near the 

 inner surface of the horn. In the main portion or body of the 

 ovary, the two arteries occupy parallel courses near the center, 

 separated by perhaps one third the diameter of the ovary. Since 

 none of the specimens at hand were injected, the course of these 

 arteries could not be traced except in a general way. But it is 

 plain that they extend posteriorly in a tortuous course through 

 the ovary and give off numerous branches, which find their way 

 to or toward the surface, where they form the capillaries so dis- 

 tinctly visible in some of the ovaries in the epithelial covering. 

 The blood from the epithelial capillaries of the anterior half of 

 the ovary is collected by veinlets, frequently quite large and dis- 

 tinct in the vicinity of the larger ova, which join to form larger 

 veins that pour their contents into the chief vein of the ovary at 

 the " horseshoe bend" (infra). This largest vein has two branches 



