210 F. W. GAMBLE, B.SC. 



over the surface, modified on each side of the body behind the 

 middle into long vermiform bodies, in which Jensen perceived a 

 central thread. The opening of the proboscis-sheath is ventral, and 

 close to the anterior end. The proboscis itself is feebly muscular. 

 The mouth is a transverse slit, surrounded by an arcuate transverse 

 row of six adhesive papillae. The eyes, two on each side, lie over the 

 brain behind the proboscis. The genital pore is ventral, a short 

 distance from the hinder end. The vasa deferential are given off from 

 the two rounded lateral testes. They unite along with the accessory 

 secretion at the base of the spirally coiled ejaculatory duct. This 

 consists usually of two coils and a terminal straight portion. The 

 spermotheca is armed anteriorly with chitinous spines ; posteriorly, 

 according to Jensen, it communicates by a long narrow duct with the 

 genital atrium. (For figures see Jensen's " Turbellaria Norvegiae " [49], 

 pi. iii, figs. 14—22). 



Habitat. — Among Zostera, Plymouth Sound ; tide-pools, Port Erin, 

 Isle of Man (F, W. G.). 



Distribution. — Bergen (Jensen). 



27. Hyporhynchus penicillatus (Schmidt, 32). 



A young immature specimen that I refer rather doubtfully to this 

 species measured *6 mm. in length. Body of a bright yellow colour, 

 the pigment being deposited in fine granules at the base of the 

 epidermal cells. Rhabdites small, occurring in numbers over the 

 surface. The aperture of the proboscis-sheath is triangular, ventral, 

 close to the anterior end. The eyes were fairly large, and provided 

 with lenses. The genital organs were not developed, hence the doubt 

 attaching to this example, which, however, in all remaining characters 

 agrees with H. penicillatus as described by v. Graff. 



Habitat. — Among Zostera, Cawsand Bay, Plymouth (F. W. G.). 



Distribution, — Lesina (Schmidt, 32), Messina, and Naples (v. Graff). 



Family VORTICID^E. 

 Rhabdocoela with a common genital pore. Germaria and vitellaria 

 united or distinct. Accessory female organs present. Uterus simple. 



