BRITISH MARINE TCTRBELLARIA. 509 



corallines and shells" (Johnston, 11); on Laminaria,6 — lOfms,, 

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

 Bay, Guernsey (Ray Lankester) ; Bordeaux (Koehler) ; Ply- 

 mouth, in 2 — 6 fms.; and between tide-marks (W. Garstang, 

 F.W. G.). 



Distribution. — Naples (var, Melobesiarum^ Lang), 

 St. Malo (Keferstein), 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 cylin- 

 drical. 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). PL XXXIX, 

 fig. 3. 



1845. Peoceros sanguinolentus, Quatrefages (18). 

 ?1864. „ „ Grube.i 



1884. Oligocladus sanguinolentus, Lang (54). 

 1886. „ „ Koehler (55). 



Length 8 — 11 mm. Breadth 3 — 4 mm. Body delicate, 

 fairly transparent. Form elongate, parallel-sided, broadly 

 rounded behind, produced in front into a pair of long, pointed, 

 contractile tentacles, between which the extreme anterior end 

 projects slightly. Colour white, especially marked along the 

 margins. The mid-dorsal line is brownish or carmine, owing 

 to the underlying main -gut and its median branch. The latter 

 exhibits two conspicuous swellings, one at the point of origin, 

 the other behind the brain. Three to four lateral diverticula 

 ' ' Die lusel Lussin v. ihre Meeresfauna,' 1864. 



