BRITISH MARINE TURBELLARIA. 505 



Habitat. — Estuary of Kingsbridge, S. Devon (Montagu) ; 

 coast of Scotland (Fleming) ; Strangford Lough (W. Thomp- 

 son) ; between tide-marks at Roundstone, Connemara (W. 

 Thompson); British coast (Harvey); Falmouth (J. Cranch, 

 vide Johnston, 38) ; Jersey, Guernsey, Herm (Koehler) ; two 

 specimens off Stoke Point, near Plymouth, 15 fras., onDiazona 

 (J. T. Cunningham, MSS.); Plymouth Sound (W. Garstang). 



Distribution. — Mediterranean, west coast of France, Scan- 

 dinavia, Denmark. 



66. PROSTHECERiEUS ARGUS (Quatrefagcs). 



1845. Pkoceros argus, Quatrefages (18). 



1859. PROSTHECEEiEPS ARGUS, Schmarda, loc. cit. 



1868, EuRYLEPTA ARGUS, Keferstein (40). 



1884. Prosthecer^us argus, Lang (54). 



1886. Proceros argus, Koehler (55). 



Length 6 — 10 mm. Body oval, bearing two short marginal 

 tentacles separated by the anterior extremity. Dorsal sur- 

 face somewhat convex, orange with white spots. The eyes 

 are numerous : on each side of the middle line extending 

 behind the brain, and continued forwards to the ventral 

 faces of the tentacles. Thus the marginal, tentacular, and 

 cephalic groups are continuous. 



Habitat, — Between tide-marks at Grand Havre, Guernsey 

 (Koehler). 



Distribution. — St. Malo (Quatrefages, Keferstein). 



Genus 31. — Cycloporus, Lang (1884). 

 Dorsal surface papillose. Pharynx short. Cells 

 of main-gut almost filiform. About seven pairs 

 of secondary branches. Uterine glands corre- 

 spond to the number of the latter. The peripheral 

 gut-branches open to the exterior through epi- 

 thelial pores. Male pore close behind the mouth. 

 Copulatory organ beneath and behind the pharyn- 

 geal sheath. Cephalic group of eyes not sharply 

 defined. Tentacles small, sometimes rudimentary. 



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