172 MEMOIRS OF THE UNIVERSITY OP CALIFORNIA 



G. pirum = Cochlodijiium pintm (Schiitt) Lemmerraami (1899). 



G. rctc = inccrtae scdis. probably near Hcmidinium. 



G. rhomboidcs. 



G. vestifici. 



G. viride^ Gyrodiniiim foUaccum Kofoid and Swezy. 



Maskell (1887) descriljed G. van'nits, Lauterborn (1894) followed ^vith G. 

 foiuissimunu and Lemmermauu (1900) added G. zncliariasi (Zaelaariasi). In 

 1902 Calkins added the species G. graciJe var. spliacrica, changed by us to G. 

 sphaericum. Dogiel (1906) described G. cocruJcum, G. a-ffinc, G. parasiticum, 

 G. roseum (^= Chytriodinmm roscum, Chatton, 1912), and G. spirale var. oMn- 

 snm. changed by ns to G. heterostriatum, Kiister (1908) added G. fucorum, an 

 imperfectly characterized Gyrodimmn. Ohno added G. hiciJiatiim in 1911. In 

 1912 Klebs described G. togoriense, G. minimiim, which we consider identical 

 with G. varians Maskell, and G. rotundatum. In the same year Jorgensen 

 added to the list G. pijrocystis. Lebonr (1917?*) was the last investigator to 

 add to this list with the following : 



G. achromaticum, G. filum, G. minur, G. pseudovoctiluca Poiichet= G. fulgcns Kofoid and 



Swezy. 

 G. viridis = G. conicum Kofoid and Swezy. 

 G. triangidaris, a doiibtful species. 



The genns Protodiniinn (Lohmann, 1908) presents the characteristics of 

 the genus Gi/DDwdinium without distinct generic features of its own, hence we 

 l)lace it with Giimnodinium, and the single species Protodi)iiH)n simplex Loh- 

 mann as G ymnodinium simplex. 



The following is a summary of the species which we consider valid in the 

 foregoing list, giving (1) the fresh- water species and (2) the marine forms: 



(1) Giimnodinium aeruginosum Stein, G. hiciliafnm Ohno, G. Jwgoriense 

 Klebs, G. cari)iatum Schilling, G. fuseum (Ehrenberg) Stein, G. helvetieum 

 Penard, G. mirahile Penard, G. miisei Danysz, G. pahistre Schilling, G. para- 

 doxnm Schilling, G. rotundatum Kelbs, G. roseolum (Schmarda) Stein, G. 

 tenuissimum Lauterborn, G. uherrimum (x\llman) Kofoid and Swezy, G. varians 

 Maskell, G. vivid e Penard, G. vorticella Stein, G. zacJiariasi Lemmermann. 



(2) Gymnodinium aeliromatieum Lebour, G. eoeruUum Dogiel, G. eucumis 

 Schiitt, G. diploconus Schiitt, G. filum Lebour, G. fusus Schiitt, G. gleha, G. 

 gracile Bergh, G. grammaticmn (Pouehet), G. lunida Schiitt, G. marinum 

 Saville-Kent, G. minor Lebour, G. pscudonoetiluea Pouehet, G. punctatum 

 Pouehet, G. pyrocystis Jorgensen, G. rhomhoides Schiitt, G. simplex (Loh- 

 mann) . G. sphaericum Calkins, G. vestifici Schiitt, G. wilczeki Pouehet. 



