16 W. BLAXLAND BENHAM. 
EXPLANATION OF PLATE 1, 
Illustrating Dr. W. Blaxland Benham’s Paper on ‘‘ The 
Blood of Magelona.” 
EXPLANATION OF FIGURES. 
Fie. 1.—Side view of the anterior region of Magelona, with the “‘pro- 
boscis” withdrawn. The thorax is coloured by the blood contained in its 
vessels. 
Fic. 2.—Side view of the anterior region of Magelona, with “ proboscis”’ 
(a) everted. The thorax is now almost colourless, the blood being driven 
into the proboscis. 
Fie. 3.—A transverse section through the thorax of Magelona, showing 
the great dilatation of the ventral blood-trunk and its extension into the 
“lateral chamber” of the body. On the right side one of the dorso-ventral 
muscles is represented separating the lateral extension of the vessel from the 
median portion. This dilated vessel comes to occupy almost the entire ccelom. 
The epidermis (ep.) is somewhat diagrammatically represented; the remainder 
is drawn with the camera. D.v. Dorsal blood-vessel, with thick muscular 
coat. V.v. The dilated ventral vessel, with thin nucleated wall. Jat. ext. 
and Z. ext. Lateral extension of the ventral vessel. /.v. Vessel from ventral 
to dorsal vessel. Ca. Celom. wn. Nerve-cord. G. The gut. cére. Circular 
coat of muscles of the body-wall. ¢.m. Longitudinal muscles. dor.v.m. 
Dorso-ventral muscle. 0d/. Oblique transverse muscle. (Camera Zeiss B 2,) 
Fic. 4.—A group of blood-globules. (x 550.) Camera drawing of 
contents of a blood-vessel from a section stained in borax carmine. The size 
of the corpuscles is practically unaltered by the preservatives. . Nucleus. 
Fic. 5.—Two globules from same section, greatly magnified. The con- 
tents have been coagulated by reagents. 
Fic. 6.—A group of globules (x 550) from a preparation of blood killed 
with Fleming’s solution, stained in picro-carmine, and mounted in glycerine. 
The globules have ‘‘fused” with one another, so that the field is filled by 
larger globules of various sizes. A coagulated plasma (p/.) is represented. 
A nucleus (z.) shows the relative size of the globules. (Camera drawing.) 
. Fic. 7.—Some isolated nuclei, showing varying numbers of chromatic 
masses. From same preparation. 
Fie, 8.—An example of nuclei apparently contained within large globules 
(from picro-carmine, glycerine preparation). #. Nucleus. pl. Plasma. 
Camera. xX 550. 
