72 
Proceedings of the Royal Society of Edinburgh. [Sess. 
DESCRIPTION OF PLATE. 
List of Reference Letters. 
A., anus; A.B.S., achsetous body segment ; Ch.S. 1 , first chsetigerous segment; 
D.Y., dorsal blood-vessel; E., epidermis; G. 1 , first gill; Go., gonad, on oblique 
muscle; I., intestine; M., mouth; M.C., layer of circular muscles; M.L., band of 
longitudinal muscles ; M.O., oblique muscle ; N.C., nerve-cord ; N.O. 1 , N.O. 2 , external 
openings of first and second nephridia; Not., notopodium ; Nr., neuropodium; 
O., oocyte ; (E., oesophagus ; (E.G., oesophageal glands ; P., prostomium ; Pe., peri- 
stomium; Ph., pharynx; S. 1 , S. 2 , S. 3 , first, second, and third septa; Sp., groups of 
developing male cells (spermatogonia and spermatocytes) ; St., stomach ; V.Y., ven- 
tral blood-vessel (surrounded by chlorogogen cells). 
All the figures are drawn from examples of Brancliiomaldane vincenti Langerhans. 
Eig. 1. Adult specimen (killed in a rather contracted condition) about 8 mm. 
long, with fifty-one chsetigerous segments, the twenty-first to fiftieth of which are 
branchiate. x 35. 
Fig. 2. Anterior end of adult specimen, about 10 mm. long; dorsal aspect. The 
groups of eyes are seen on the prostomium (P.). x 43. 
Fig. 3. Anterior portion of a specimen about 10 mm. long, after staining and 
clearing ; to show the alimentary canal and septa, which have been drawn somewhat 
diagrammatically. x 35. 
Fig. 4. Posterior portion, including the last thirteen chsetigerous segments and 
the pygidium, of a well-extended specimen, 10 ’5 mm. long. Note that the segments 
are bi-annulate, the anterior larger ring being chsetigerous, and the posterior smaller 
one branchiferous. x 35. 
Fig. 5. Transverse section, passing through the fortieth segment, of a mature 
specimen. Note the presence, in the coelom, of numerous oocytes, and two masses of 
male cells (Sp.). x 95. 
( Issued separately April 11, 1912.) 
