DEVELOPMENT AND ANATOMY OF SOME EARTHWORMS. 13 
between Segments VI-vII, VII-VIII, and viI-1x; the two pores 
of each pair are remarkably close together, so close as to be 
only recognisable with care as separate apertures. 
Dorsal Pores.—The most anterior dorsal pore lies between 
Segments v and v1; they are present in the clitellar region in 
the young worm, but become completely obscured when the 
clitellum is developed. 
Alimentary Tract.—The gizzard is in Segment vii; dilated 
portions of the cesophagus serve as calciferous glands in Seg- 
ments 1x to xv; they are large in Segments x1 to xiv only. 
* The typhlosole is a simple flap, deep, down to about Seg- 
ment LxIv; there it narrows, becomes a mere ridge, and goes 
on to Segment cxvul, and there ends abruptly, and at the 
same place the alimentary epithelium changes and becomes 
rectal. 
Vascular System.—The dorsal vessel is double in Seg- 
ment vir and onwards for a considerable distance. 
Nephridia.—Minute micronephridia are present in large 
numbers. ; 
Generative System.—The testes lie in Segments x and x1, 
and are attached to the septa bounding these segments ante- 
riorly. The ciliated rosettes lie in the usual position. Pros- 
tates are large and rounded, and are provided with a muscular 
duct. The seminal reservoirs lie in Segments 1x and x11. The 
spermathece are sausage-shaped sacs with a short duct, and a 
small cecum lying in the thickness of the body-wall, and, 
what is very unusual, increase in size from before backwards. 
A spermatheca of Segment 1x is more than three times as long 
as one of Segment vil. The ovaries and oviducts lie in the 
usual positions. 
Pericheta pellucida, sp. nov. 
Length 450 mm. Circumference 12 mm. 
Colour.—The body-wall is very transparent, so that the 
colouring depends on the blood and the contents of the alimen- 
tary canal. 
