Nouvelle Monographie des Sangsues médicinales. Paris, 1857.

[453]

Quart. J. Micr. Sci. xxvi. 1886, p. 317.

[454]

See Grube, "Annulaten" of Middendorff's Sibirische Reise, Zoology, 1851, p. 20; and Kowalevsky, Bull. Ac. St. Petersb. v. June 1896.

[455]

See ref. on p. [395].

[456]

Asajiro Oka, Zeitschr. wiss. Zool. lviii. 1894, p. 79.

[457]