46 ILLINOIS BIOLOGICAL MONOGRAPHS [46 



however, he described the above species from the same host, overlapping 

 his first observations with two names. 



Diesing (1859) refers to this species thus: 



Receptaculum globosum. Corpus ovoideum receptaculo duplo longius. Longit .... 

 cnissit . . . . 



He regards it as synonymous with the specimens seen by von Siebold and 



described by Kolliker as follows : 



Neben dieser Gregarine fand v. Siebold in Gammarus pulex noch eine andere Form (Fig. 29c), 



von der es zweifelhaf t bleibt, ob sie als Entwicklungsform zu der Gr. longissima zu rechnen 



ist oder nicht. 



Kolliker's figure obviously represents an entirely different species which 



seems to correspond to one mentioned later in this discussion. 



Lankester (1863) regards these as synonymous: 



Gregarina longissima Sieb., Gr. diffluens Dies., Gr. millaria Dies., Gr. 

 putanea Leuckart, Gr. Gammari Sieb. 



Plate (1886) found in the intestine of Gammarus pulex two polycystid 

 gregarines. One is small, elongate cylindrical, 255 in length, the other 

 long-ovoidal, 425/t in length. The one seems to correspond with Didy- 

 mophyes longissima and the other with Gregarina gammari. 



This species agrees in form and proportions with Cephaloidophora 

 maculata from Gammarus marinus but sporonts of the present species 

 attain 425ju in length while those of the former reach only 80/x. 



Two species described by Diesing (1851:7) both from Gammarus pulex 

 are sufficiently alike to be considered synonymous. No detailed descrip- 

 tion of the species (? Gammari von Sieb.) is extant and so they cannot be 

 compared in minutae with the present species, but since all three are 

 found in the same host they should obviously be considered together under 

 the oldest name. These species are mentioned below 

 1851 Gregarina millaria Diesing 1851: 7 

 1859 Gregarina millaria Diesing 1859:731 



Proboscis cylindrica gracilis, apice obtuse conica, uncinulorum seriebus 10-20. Receptaculum 

 subglobosum papillosum. Corpus ellipticum turgidum receptaculo triple longius, laete 

 auranticum. Longit. Y"i ' ', crassit. . . . 



Hosts: Gammarus pulex, Astacusfluviatilis. Intestine. 

 1851 Gregarina diffluens Diesing 1851: 7 

 1859 Gregarina diffluens Diesing 1859: 731 



Proboscis cylindrica brevis gracilis, apice longe conica obtusa, uncinulorum seriebus 10-20. 

 Receptaculum subglobosum papillosum. Corpus oblongum per intervalla coarctatum postice 

 rotundatum, saturate auricatum, facillime diffluens. Longit. 1 ' ' '; crassit. 



Host: Gammarus pulex. 



[? sp. Mawrodiadi] 

 1908 No name Mawrodiadi 1908: 101 



1911 Gregarina sp. Sokolow 1911:287 



1912 No name Tregouboff 1912: Iviii 



