494 F. W. GAMBLE. 



breadth. Anterior margin truncate, produced at the angles 

 into a pair of distinct forwardly-directed auricles. Behind 

 these a slight " neck " occurs. Posterior end broadly rounded 

 or bifid. Colour variable. Young specimens are pale grey. 

 In older examples the pigment is darker, and has a streaky 

 appearance. On the dorsal surface just behind the eyes the 

 pigment is arranged as a median and two lateral bands. The 

 two latter cease behind the ''neck." The median one 

 runs forward between the eyes, and then dividing into 3 — 4 

 bands, it disappears. The modified strip of integument {' Tast- 

 Organ/ which occurs among all groups of Turbellaria) is pre- 

 sent. Pharynx inserted at the centre of the body. Two eyes are 

 present anteriorly. They are placed in the white areas bounded 

 by the pigment stripes. The genital pore lies slightly 

 behind the commencement of the posterior third. Testes 

 occur between the intestinal branches throughout the length 

 of the body. The single pair of germaria are placed just 

 behind the eyes and outside the lateral nerves. Vasa defe- 

 rentia run at tlie sides of the pharynx and open into the peg- 

 like penis, which is directed obliquely dorso-ventrally. The 

 yolk-glands lie in the septa under the alimentary 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 progression of fresh-water Planarians.^ 



Habitat. — Among roots of Laminaria, Berwick Bay (John- 

 ston, 49) ; in brackish water on west coast of Scotland 

 (Mcintosh, 45). 



Distribution. — Coast of Denmark, Holland, Belgium, Nor- 

 way, Sweden, Black Sea, Baltic. 



Genus 26. — Fovia, Stimpson (32a). 



59. Fovia apfinis, Stimpson. PI. XXXIX, fig. 9. 



1844. Planakia affinis, Oersted (16). 

 1853. „ iiEBES, Dalyell (29). 



' This account is chiefly taken from lijima, loc. cit. 



