The annals and magazine of natural history : zoology, botany, and geology . mm. in length and003r> nun. in width. It curves forwards irom the genital 508 Mr. II. A. Biiylis on atrium towards the anterior border of tlie segment, and endsat, or even beyond, tiie middle line. The testes (tig. 4, T.)immber about twenty, and occupy the posterior half of thesegment. There is a much-colled vas deferens. The ovaryconsists of two groups of lobes, the larger group being on theaporal side. Between the two portions of the ovary there isa large rounded receptaculum seminis (tig. 4, ); close to Fig.
The annals and magazine of natural history : zoology, botany, and geology . mm. in length and003r> nun. in width. It curves forwards irom the genital 508 Mr. II. A. Biiylis on atrium towards the anterior border of tlie segment, and endsat, or even beyond, tiie middle line. The testes (tig. 4, T.)immber about twenty, and occupy the posterior half of thesegment. There is a much-colled vas deferens. The ovaryconsists of two groups of lobes, the larger group being on theaporal side. Between the two portions of the ovary there isa large rounded receptaculum seminis (tig. 4, ); close to Fig. 4. /?. MonopyUditim arcticiim ; semi-diagrammatic drawing of a maturesegment (from a whole preparation). C 5., cirrus-sac ; , genital atrium; Or., ovary ; i?.*?., receptaculumseminis ; S., shell-gland ; T., testes; V., yolk-gland j Vg., vagina. this is the shell-gland (fig. 4, 6.), and behind both these thecompact yolk-gland (fig. 4, V.). There are only a few ripesegments at tlie posterior end of the strobila. There is nodefinite uterus, the ova being embedded singly in the paren-chyme. The onchospheres are about 20 jx in diameter. Tliis form differs from M. ciyiguUferum (Krabbe) in anumber of points, notably in its smaller number of testes, Entozoa from the Murmun Coast. 509 wliilo it is readily distitjf^uisliod from }f. macmranthum,Fulirm., l»y the luiicli smaller size of its hooks. Bolli thesespecies occur in closely related hosts. Monopylidium stercorarium, sp. n. (Figs. 5-7.) Host: Stercorarius f^marinux (pomatorhiiie skua). Yu-kanski, 22. vi. 1917. This is a comparatively sliort w
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Keywords: ., bookcentury1800, bookidser9annalsmaga, booksubjectnaturalhistory
