TURBELLARIA OF PLYMOUTH SOUND. 39 
Genus 2,.—Monoporvs. 
2. Monoporus ruBRopuncratus (O. Schmidt). 
Found in the same localities as the foregoing. Both are Medi- 
terranean species. 
Family APHANOSTOMID AE. 
Genus 3,—APHANOSTOMA. 
3. APHANOSTOMA DIVERSICOLOR Oersted. 
In various localities between tide-marks. Not uncommon in the 
diatom-deposit on the sides of the tanks in the aquarium. 
4, APHANOSTOMA ELEGANS Jensen. 
A single specimen amongst Ulva at Redding Point. 
Genus 4.—CoNnvoLuta. 
5. CoNnvoLura SALIENS v. Graff. 
This species is apparently rather rare at Plymouth. Among 
Zostera from Cawsand Bay is the habitat for it. The curious mode 
of progression by sudden leaps, which co-exists along with the usual 
method of continuous movement, was first described by v. Graff 
in his “‘ Monograph,” and is apparently unique. 
6. CoNVOLUTA PARADOXA Oersted. 
Widely distributed in the littoral zone; nowhere, however, very 
abundant, nor do the specimens attain the dimensions of Millport 
examples. 
7. CoNVOLUTA FLAVIBACILLUM Jensen. 
Among sand in the creeks at Picklecombe Fort, Wembury Bay, 
and Bovisand Bay. 
