Free‐living marine Rhabdocoela (Platyhelminthes) from the N. American Pacific coast. With remarks on species from other areas

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Abstract
From the N. American Pacific coast the following taxa are described: Coronopharynx pusillus Luther, Pogaina bicornk sp.n., P. paranygulgus sp.n. (Provorticidae); Brinkmanniella palmata sp.n., Tvaerminnea karlingi pucifica subsp.n. (Promesostomidae); Trigonostomum setigerum O. Schmidt, Messoplana pacifica sp.n., Ceratopera axi (Riedl), C. ehlersi sp.n., C. pilifera sp.n. (Trigonostomidae); Polycystis ali Schockaert, P. hamata sp.n. (Polycystididae). From other areas: Brinkmanniella palmata from the Skagerrak, Black Sea and Mediterranean Sea; Ceratopera axi from the Falkland Islands; Polycystis ali from Galapagos Islands; Ceratopera bermudensis sp.n. from Bermuda. Polycystis ali is considered to be a polytypic species with the forms ‘Somali’, ‘California’ and ‘Galapagos’. Brinkmanniella augusti Marcus and B. falklandica Westblad are considered to be species incertae sedis. Problems in penetrating the world‐wide marine turbellarian fauna are discussed.