BRITISH MARINE TURBELLARIA, 251 



Monotus albus, Lev. 



Automolus horridus, n. sp. 



„ 1 ophiocephahcs (0. Sch.). 

 3. The relations of the Turbellarian fauna of our coasts with that 

 of neighbouring seas cannot be determined with certainty until more 

 extended observations are recorded than we possess at present. Medi- 

 terranean and Adriatic forms occur on our south-western stations 

 (Plymouth, &c). Thus seven Polyclads and sixteen Rhabdocceles 

 (33 per cent, of our fauna) are common to Naples, Trieste, and 

 Plymouth. A large proportion (about 70 per cent.) of Scandinavian 

 forms occur on our coast. 



IV. Appendix. 



Synopsis of the Families, Sub-families, Genera, and Species of 



British Marine Turbellaria. 



I. RHABDOCCELIDA. 



Section A. — Acxela. 



1. With a single genital pore - - - Family Proporidae. 



a. Without spermotheca - Genus Proporus. 

 Species: — P. venenosus (elongate, yellow, two eyes present, 



provided each with a large lens). 



b. With spermotheca .... Genus Monoporus. 

 Species : — M. rubropunctatus (eyes without lenses, composed 



of red pigment-masses placed in the epidermis). 



2. With two genital pores, the female pore in front of the male 



Family Aphanostomidse. 



a. Spermotheca with soft, non-chitinous mouth-piece 



Genus Aphanostoma. 

 Species : — J. diversicolor (central part of the anterior end 

 violet, extremities yellow). A. elegans (centre of the body 

 with a lobate green spot). 



b. Spermotheca with chitinous mouth-piece Genus Convoluta. 

 Species: — C. saliens (with alternate longitudinal rows of cilia 



and rhabdites). C. paradoxa (with two eyes and "yellow 



