508 
MR. F. E. BEDDARD ON THE 
abundantly found in the septa, mark it out as something distinct. These facts 
(in the absence of embryological data) are also quite in harmony with the view 
that the muscle plate in Lwmbricus is like that of Petromyzon, “ formed 
by the neighbouring borders of two myoblasts,” and that the septa form the 
boundaries of muscular compartments which are comparable to those of 
Pleurocheeta or to the “ Muskelkistchen” of Petromyzon. 
EXPLANATION OF PLATES. 
PLATE XXV. 
d, Dorsal vessel. l, Lateral vessel. 
s, Supra-intestinal. x, Prostate glands. 
b, Supra-nervian. p, Dorsal pouches. 
h, Heart. y, Spermathece. 
1.—General view of Plewrocheta Moseleyi, half natural size. , kidney-shaped glands. 
2,—Dorsal vessel; a is the same.as a@ in fig. 5. 
3.—Vessels of segments 11th, 12th, and 13th; the letter ilies on the intestine ; m, 
mesenteries ; the lateral vessels are left out to simplify the figure. 
4.—General scheme of circulation. 
5.—Vessels of segments 7th, 8th, and 9th. 
6.—Anterior course of lateral and supra-nervian trunks. 
7.-—General view of the anterior part of the body, rather more than half the natural size. 
The main divisions of the alimentary canal are shown. ¢, testes; 0, oviducts (?). 
8.—Portion of body with intestine laid open, to show the dorsal pouches; ¢ points 
to the dorsal fibrous band, / to the ventral, and a to one of the lateral ones. 
9,—Clitellum showing the four pairs of apertures ; three pairs close together at posterior 
margin, barely within the clitellum. 
. 10.—Vessels of one segment on one side—a little anterior to kidney-shaped glands. 
‘ig. 11.—One of the kidney-shaped glands, showing its duct and. blood-vessels of same 
Fig 
segment. 
. 12,—Three of the kidney-shaped glands, with adjacent blood-vessels. Twice natural size. 
Fig. 13.—Spermatheca. About three times the natural size. 
PLATE XXVI. 
1.—Diagrammatic transverse section through anterior part of body, to show arrangement 
of vascular trunks, which are lettered as in preceding plate. , nerve cord. 
2.—Section through body in front of fig. 1, showing absence of supra-intestinal vessels. 
3.—Transverse section through clitellum, showing one of the glands. ¢, transverse 
muscular coat ; 7’, longitudinal. x 60. 
4.—Section through body wall cut transversely to the longitudinal coat, showing . 
capillaries ending in epithelium. x 120, 
= 
