246 F. W. GAMELE, B.SO. 



tentacle receives a branch of the intestine. Extending from the brain 

 towards the hinder margin of the pharynx are two groups of eyes, 

 which stand out very clearly against the white underlying pharyngeal 

 region. Posteriorly they are divergent, and consist of small, loosely 

 aggregated eye-specks, which become larger and crowded in front, the 

 two groups converging towards the brain. Eyes are also present in 

 the tentacles and around their bases. The sucker is well developed, 

 and serves to attach the animal very firmly to the substratum. The 

 male genital aperture lies under the hinder end of the pharynx. The 

 vasa efferentia unite in a large expanded duct on each side, from which 

 the two vasa deferentia arise. The ductus ejaculatorius receives the 

 contents of the granule-gland and the large vesicula seminalis. Just 

 in front of the sucker lies the female pore, surrounded by the extensive 

 radiating shell-gland. The uterus lies at the sides of the main-gut. A 

 single pair of uterine glands are present. 



Habitat. — " On the coast of Berwickshire, in deep water on corallines 

 and shells " (Johnston, 11); on Laminaria, 6 — 10 fms., Belfast Bay 

 (W. Thompson) ; Firth of Forth (Dalyell) ; Firman Bay, Guernsey 

 (Ray Lankester) ; Bordeaux (Koehler) ; Plymouth, in 2 — 6 fms., and 

 between tide-marks (W. Garstang F. W. G.). 



Distribution. — Naples (var. Melobesiarum, Lang), St. Malo (Kefer- 

 stein), Droback (Miiller). 



Genus 33. — Oligocladus, Lang (1884). 

 Body smooth. Tentacles long, capable of movement. Mouth in front 

 of the brain. Pharyngeal sheath produced posteriorly into a closed 

 diverticulum, which extends beyond the sucker. Pharynx cylindrical. 

 Three to four pairs of secondary gut-branches. The main-gut 

 apparently opens to the exterior at its hinder end. Male and female 

 genital apertures lie under the pharyngeal sheath. Four pairs of 

 uterine glands are present. The double cephalic eye-group sharply 

 defined, not elongated behind. 



69. Oligocladus sanguinolentus (Quatrefages). PI. X, fig. 3. 



1845. Proceros SANGUINOLENTUS, Quatrefages (18). 

 ? 1864. „ „ Grube* 



* 'Die Insel Lussin u ihre Meeresfauna,' 1864. 

 1884. Oligocladus sanguinolentus, Lang (54). 

 1886. •„ „ Koehler (55). 



