40 TURBELLARIA OF PLYMOUTH SOUND. 
B. RHABDOCCLIDA. 
Family MICROSTOMIDAS. 
Genus 5.—MIcRostoma. 
8. MicRosToMA GR@NLANDICUM Lev. 
Among Ulva, Redding Point. 
Family MESOSTOMID A. 
Genus 6.—PROMESOSTOMA. 
9. PRoMESOSTOMA MARMORATUM (Schultze). 
Variable in coloration and in the form and dimensions of the 
crosier-like copulatory organ. Not uncommon in tide-pools in 
Wembury Bay, Drake’s Island, and Redding Point. 
10. PromEsostoma ovorDEuM (O. Schmidt). 
Occasionally dredged near the Duke Rock. 
11. Promusostoma souea (O, Schmidt). 
Abundant in dredging taken from almost all localities. 
12. PromgsosToMA AGILE (Levinsen). 
Among Zostera in Cawsand Bay. 
Genus 7.—ByYRSOPHLEBS. 
13. ByRSoPpHLEBS GRAFFI Jensen. 
Drake’s Island, low spring-tide. Amongst algze. 
14. ByrsopHLEBS INTERMEDIA V. Graff. 
In the same locality as the foregoing. 
Genus 8,—PROXENETES. 
15. PRoxENETES FLABELLIFER Jensen. 
In tide-pools on the north side of Cawsand Bay. 
