TURBELLARIA OF PLYMOUTH SOUND. 43 
31. PLaciostoma vittatum (Frey u. Leuckart). 
An abundant littoral species in all localities. The variations in 
colour are great, and are discussed by v. Graff and myself. Hgg- 
capsules were obtained from the Breakwater in September. 
32. PLAGIOSTOMA KORENI Jensen. 
Among algze on the Breakwater and at Redding Point, also among 
diatom-deposit in the tank-room of the Laboratory. 
33. ? PLAGIOSTOMA SIPHONOPHORUM (Schmidt). 
A specimen in the Millbay Channel. (See “‘ Brit. Mar. Turbellaria,” 
p. 477.) 
34, PLAGIOSTOMA GIRARDI (Schmidt). 
At extremely low spring-tide, Wembury Bay, and in tide-pools on 
the north side of Cawsand Bay. Not uncommon on the Duke Rock 
and in Millbay Channel. 
Genus 15,—VoRTICEROS. 
35, VorticErRos auricoLatum (O. F. Miller). 
Found in the same localities and under the same conditions as 
Plagiostoma vittatum. 
36. VorticrRos LuTeumM v. Graff. 
A single specimen dredged off the New Grounds ; another obtained 
on the inner side of the Breakwater. 
Genus 16,—ENTEROSTOMA. 
37. ENTEROSTOMA AUSTRIACUM V. Graff. 
Specimens referable to this species occurred commonly in the 
Sound at depths below 5 fathoms. 
38. ENTEROSTOMA FINGALIANUM Claparéde. 
Among Floridex, Wembury Bay. 
Genus 17,—CYLINDROSTOMA. 
39. CYLINDROSTOMA QUADRIOCULATUM (R. Leuckart). 
Abundant in the same locality as the preceding. 
