BRITISH MARINE TURBELLARIA. 233 



Family PLANAPJID.E. 



Genus 25. — Gunda, 0. Schmidt (18G0), 

 58. Gunda ulvze (Oersted). 



? 1768. Hirudo littoralis, Strom (1). 



? 1776. Planaria littoralis, Midler (3). 



1844. „ ULV^E, Oersted (16). 



1857-8. Procerodes ulVjE, Stimpson (32a) 



? 1860. Planaria littoralis, van Benedin (33). 



1861. Fovia littoralis, Diesing, S. B., 'Akad. wiss. Wien," 

 Bd. xliv. 



1861. Procerodes uxviE, Diesinq, loc. cit. 



1865. Planaria ulv^e, Johnston (38). 



1870. ,, ,, Uljanin (41). 



1878. Procerodes ulv^e, Jensen (49). 



1880. Planaria ULViE, Czerniavsky (52). 



? 1880. SYNHAGA AURICULATA, Czerniavsky (52). 



1881. Gunda ulVjE, Lang, 'Naples Mittheil. ,' ii. 



1887. ,, ,, Iijima, 'Journ. Coll. Sci. Imp. Univ. Japan,' 



vol. i, part 4. 

 1889. ,, ,, Wendt, ' Archiv f . Naturgeschichte,' Bd. i, 



Heft. 1. 



Length 3 — 7 mm. Breadth "4 — 1 mm. Body of uniform 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 bauds, it disappears. 

 The modified strip of integument (' Tast-Organ,' which occurs among 

 all groups of Turbellaria) is present. 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 germ aria are placed just behind the eyes and outside 

 the lateral nerves. Vasa deferentia run at the 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 



