280 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



fore necessary, according to the zoological Code of Nomenclature, to displace 

 Schiitt's Spirofh')]iuni with a neAv generic name. We accordingly propose the 

 appropriate and suggestive name Giirndinium in lieu of Spirodinium. Its type 

 species is Gijyodininm spiral e, described as Gjjmnodinium spinde by Bergh 

 (]881?>) and used by Schlitt (1896) as his t\T)e of the genus Spirodinium. 



Schiitt (1896). in thus calling attention to the need of reA'ision of the genus 

 Gijmnodini'nm. failed to follow it up by removing from the genus those species 

 which he had himself described earlier (1895) as species of Gymuodininm. Imt 

 which possessed the characteristics of his new genus. Lemmermann later ( 1899) 

 transferred some of these to Spirodinium as follows, which we cite Avith our 

 own allocation: 



Gyrnnodinium cornutum Sehutt = Spirodinium schuctti (Sehiitt) hemm.^ Gy rod iniutyi 

 schuetti (Schiitt) Kofoid and Swezy. 



(?. spirale var. mitra Schiitt =^ Spirodinium spiraJe var. mitra (Schiitt) hemra.^^Gyro- 

 dinium mitra (Schiitt) Kofoid and Swezy. 



G. spirale var. obtusa Schiitt^ Spirodinium spiralc var. obtusum (Schiitt) Lemm. :== 

 Gyrodinium obtusum (Schiitt) Kofoid and Swezy. 



G. spirale var. pepo Schiitt = Spirodinium spirale var. pepo (Schiitt) Lemm.^ Gyrodi- 

 nium pepo (Schiitt) Kofoid and Swezy. 



G. spirale var. pinguis Schiitt ^Spirodinium spirale var. pingue (Schiitt) Lemm. ^ 

 Gyrodinium pingue (Schiitt) Kofoid and Swezj'. 



In addition to these species we have also transferred to Gi/rodinium the 

 following species described by Schiitt (1895) as species of Gijmuodiuium: 



Gyrnnodinium contortum Schutt ^ Gyrodiniiim contortum (Sehiitt) Kofoid and Swezy. 



G. opimum Schiitt ^= Gyrodinium contortum nom. sp. nov. 



G. ovum (Schiitt) ^Gyrodinium ovum (Sehiitt) Kofoid and Swezy. 



G. parrulum Schiitt =^ Gyrodinium parvulum (Schiitt) Kofoid and Swezy. 



G. viride Schiitt ^ Gyrodinium foliaceum nom. sp. nov. 



G. fusus Schiitt = Gyrodinium falcatum nom. sp. nov. 



Lemmermann (1899 and 1900) also transferred to Spirodinium the following 

 species described by the authors specified as species of Gyrnnodinium, which we 

 cite here with our own allocation : 



Gymnodinium spirale var. nobilis Ponchet = Spirodinium spirale var. nobilis (Pouehet) 



Lemm. = Gyrodinium. indeterminable. 

 G. spirale var. cornutum Fouchet = Spirodinium cornutum (Pouehet) heimn.^Gyrodi- 



nium cornutum (Ponchet) Kofoid and Swezy. 

 G. crassum Fonchet^ Spirodinium crassum (Ponchet) hemm.^ Gyrodinium crassum 



(Pouehet) Kofoid and Swezy. 

 G. hyalimim Schilling =^ Spirodinium hyalinum (Schilling) Lemm. ^ Gi/rorfrwuan hyali- 



num (Schilling) Kofoid and Swezj-. 

 G. pusillum Schillings Spirodinium pusillum (Schilling) Lemm. ^ Gyrodinium pu.'iiUum 



(Schilling) Kofoid and Swezy. 

 G. fissum hexander =^ Spirodinium fissum (Levander) hemxa.=^ Gyrodinium fissum 



(Levander) Kofoid and Swezy. 



The nmul)er of species added later to the genus Spirodinium are few. In 

 1910 ]\Ieunier described Spirodiniiim. fusus, overlooking the fact that the species 

 name was preoccupied by Schiitt's (1895) species. This we have designated 



