BRITISH MARINE TURBELLARIA. 



225 



The posterior end of the body is occupied by the large spermotheca. 

 The germ-yolk-gland is composed of an anterior vitelline, and a pos- 

 terior germinal portion. 



Habitat. — Kilmore, Skye (Claparede) ; abundant in tidepools, 

 Millport (v. Graff) ; among Pt'dota, Ceramium, and other algee, 

 Plymouth (F. W. G.). 



Distribution. — Faroe, west coast of Norway (Claparede and Jensen), 

 Heligoland (Leuckart), Ostend (van Beneden), Sebastopol (Uljanin). 



49. Cylindrostoma inbrme (Hallez, 50). PI. X, fig. 4. 



Length 1 mm. Body oval, broadly rounded in front, tapering 

 behind, of a bright yellow colour. Opposite the level of the brain, 

 right and left, are a pair of lateral grooves, bordered by long cilia. The 

 epidtrmis contains masses of granular yellow pigment and rhomboidal 

 rhabdites. Mouth ventral, behind the brain. The pharynx is 

 cylindrical, with a crenulate anterior margin. The genital organs 

 resemble those of Cyl. quadriocidatum very closely ; a spermotheca, 

 however, is absent. 



Habitat. — Among fine red seaweeds, Plymouth (F. W G.). 



Distribution. — Wimmereux (Hallez). 



This species exhibits very great similarity to Cyl. Klostermanni, 

 Jensen, especially in form, colour, and general anatomy. The chief 

 points of distinction are the absence of calcareous bodies in the 

 epidermis, and of a spermotheca. 



50. Cylindrostoma elongatum, Levinsen. PI. XII, fig. 19. 



Length '6 — *8 mm. Body very elongate, narrow, cylindrical, slightly 

 tapering and rounded in front, pointed behind. An apparent groove 

 was seen just above the level of the brain, separating off the portion 

 of the conical head in front of it. Colour yellowish to the naked eye ; 

 a black spot (the intestine) lies in the centre. The epidermis bears 

 specially long cilia at the extremities. Small mucus-rods are present 

 in large numbers. Glands open at the anterior end in front of the 

 brain. Mouth ventral, posterior. Pharynx attached to the hinder 

 end of the gut, barrel-shaped, its free margin crenulate, The intestine 

 p 



