CLASSIFICATION OF RHABDOCOELIDA 



49 



Classification of Rhabdocoelida. 



Family. 

 PROPORIDAE . 



Aphanostomatidae 



ACOELA. 



Genus and British species. 

 I'roporus venenosits 0. Sch. Plymouth. 

 Afonoporua rubroputictatus 0. Sch. Plymouth. 

 Haplodiscus. 



Aphanostoma diversicolor Oe. Common. 



A. elegans Jen. Plymouth. 

 ('<>/iroluta saliens Grff. Plymouth, Millport. 



C. paradoxa Oe. (Fig. 19, B). Common. C. flavi- 

 bacillum Jen. Plymouth, Port Erin, Millport. 

 Amphicoerus. 

 Polychoerus. 



RHABDOCOELA. 



M AC ROSTOM ATI D A E 



MlCROSTOMATIDAE 



Prorhynchidae 



Mesostomatidae . 



Proboscidae 



Mecynostoma. 

 Macrostoma hystrix Oe. 



Omalostoma. 



Stagnant water. 



Microstoma linearc Oe. Fresh water. 



M. groelandicum Lev. Plymouth, among Ulva. 

 Stenostoma (Catenula) lemnae Dug. Near Cork. 



S. leucops 0. Sch. Common in fresh water. 

 Alaibrina claparedii Grff. Skye. 



Prorhynchus stagnalis M. Sch. In Devonshire rivers. 

 Promesostoma marmoratum M. Sch. Common. 



P. ovoidcum 0. Sch., P. agile Lev. Plymouth. P. 



solea 0. Sch. Plymouth, Port Erin. P. lenticu- 



latum 0. Sch. Port Erin. 



Byrsophlebs graffvi Jen. Plymouth, Millport. 



B. intermedia Grff. Millport, Port Erin. 

 Proxenetes fldbellifcr Jen. Millport, Plymouth, Port 

 Erin. 

 P. cochlear Grff. Millport. 

 Otomesostoma. 



Mesostoma productum Leuck., M. lingua 0. Sch., M. 

 ehrenbergii 0. Sch., M. tetragonum 0. F. M. (Fig. 

 19, A). All at Cambridge. 

 M. rostratum Ehr. Widely distributed. M. oiridatwm 

 M. Sch. Manchester. J/, robertsonii Grff., M. 

 flavidum Grff. Both at Millport. 

 Bothromesostoma pcrsonatiim O. Sch. Preston. 

 Castrada. 



Millport, St. Andrews. 



VOL. II 



Pseiuiorhynchus bifidus M'Int. 



Port Erin. 

 Acrorhynchus caledonicus Clap 

 Macrorhynchus naegelii Roll., 



mouth, Millport. 

 M. helgotandieus Metsoh. West coast. 

 Gyrcaor hermaphrodittu Ehrbg. St. Andrews. 



common in fresh water. 

 Hyporhynchw armatus Jen, Plymouth, Port Erin 

 H. penicillatus 0. Sch. Plymouth. 



E 



Generally distributed ; 

 M. aroceuB Fabr. Ply- 



Also 



