23] STUDIES ON GREGARINESKAMM 23 



possess an epimerite have the body behind it divided into protomerite and deutomerite by a 

 septum, and have hence been termed Polycystida . . . , while those without an epimerite 

 are also without a septum; hence Mondcystida . . . But in one family, Doliocystidae, LabW, 

 an epimerite is present, and may attain a considerable size . . . without any septum dividing 

 the rest of the body ... It is purely a matter of definition whether those forms be con- 

 sidered as Cephalina without a septum, or as Monocystis with an epimerite. The Cephalina 

 in which the body is non-septate are sometimes distinguished as Dicystida from those in 

 which there is a distinct protomerite and deutomerite (Tricystida). These terms are to be 

 understood, however, in a purely descriptive sense, and cannot be used for classificatory 

 purposes, as there is no doubt that many dicystid species are derived from tricystid forms 

 secondarily, by obliteration of the protomerite .... On the other hand, such forms as the 

 Doliocystidae .... appear to be truly and primitively dicystid, and are to be regarded as 

 intermediate forms transitional from Acephalina to Cephalina. 



Genus LECUDINA MINGAZZINI 1891:469 



Body non-septate, epimerite regularly simple. Spores ovoidal, thick- 

 ened at one pole. 



LECUDINA PELLUCIDA (Kolliker) Mingazzini Type species 

 [Figure 126] 



1848 Gregarina pettucida Kolliker 1848: 35 



1851 Gregarina pettucida Diesing 1851:17 



1859 Gregarina pettucida Diesing 1859: 739 



1872 Monocystis nereidis Lankester 1872: 343 



1891 Lecudina pettucida Mingazzini 1891:469 



1893 Lecudina pettucida Mingazzini 1893: 51 



1893 Doliocystis pettucida Leger 1893: 204 



1899 Doliocystis pettucida Labbe 1899:33 



1903 Doliocystis pettucida Minchin 1903: 202, 327 



1909 Doliocystis pettucida Brasil 1909: 119 



1913 Doliocystis pettucida Ellis 1913: 287 



Sporonts solitary, ellipsoidal or ' 'bottle-shaped," rectangular or rounded 

 at anterior end and broadly rounded at posterior. Nucleus spherical. 

 Epimerite a simple small papilla. 



Cysts small, dehiscence by simple rupture, spores ovoidal, 7 by SM, with 

 thickening at one pole. 



Taken at Triest, Naples, and in the Gulf of Marseilles. 



Intestine of Nereis cultrifera Grube and N. beaucourdrayi Aud. Kol- 

 liker's figure indicates a differentiation in the protoplasm of the anterior 

 end of the body from that of the remainder. 



Mingazzini describes the body as nearly transparent, especially at the 

 anterior end, and both mentions and illustrates the retractility of the 

 anterior end within the body. 



