234 P - W. GAMBLE, B.SC. 



canal. The oviducts unite, and the common duct thus formed opens 

 into the neck of the uterus, which is placed behind the genital atrium. 

 The movements of this animal closely resemble the leech-like pro- 

 gression of fresh- water Planarians.* 



Habitat. — Among roots of Laminaria, Berwick Bay (Johnston, 49) ; 

 in brackish water on west coast of Scotland (Mcintosh, 45). 



Distribution. — Coast of Denmark, Holland, Belgium, Norway, 

 Sweden, Black Sea, Baltic. 



Genus 26. — Fovia, Stimpson (32a). 



59. Fovia afpinis, Stimpson. PI. X, fig. 9. 



1844. Planaria affinis, Oersted (16), 

 1853. ,, hebes, Daly ell (29). 



1857-8. Fovia affinis, Stimpson (32a). 



1865. Planaria affinis, Johnston (38). 



1878. Fovia affinis, Jensen (49). 



Length 4 — 6*5 mm. Body linear-oblong, convex above, flat beneath. 

 The form of the anterior end is described by Johnston and figured 

 by Dalyell as slightly enlarged and rounded. Oersted's (16) pi. i, 

 fig. 6, probably represents this species. The explanation of the plate 

 states it to be Planaria littoralis, which, however, is not the case, since 

 the latter is synonymous with Planaria ulvce. A specimen taken at 

 Plymouth is figured on PI. X, fig. 9. The anterior end tapers 

 slightly, and when viewed " end on " presents two slight lobes, which 

 are used in a vigorous sensitive way, as in the case of Convoluta 

 jiaradoxa. 



The colour varies from greenish-brown to wood-brown. An oval 

 white spot in the hinder half of the body marks the pharynx. The 

 two eyes lie each at the inner side of a white area, and from them a 

 pair of dark parallel streaks of pigment run to the anterior margin. 



The movements of the animal are very striking. The most usual 

 method of locomotion is by arching the body and drawing the hinder 

 end up to the anterior one. These " geometer " or leech-like move- 

 ments are repeated with great rapidity. This kind of motion is 

 chiefly effected on moist surfaces. When, however, the water is 



* This account is chiefly taken from Iijima, loc. cit. 



