82 ILLINOIS BIOLOGICAL MONOGRAPHS [292 



fignres of the two species, that they are quite unlike. Balbiani's species 

 lacks the dilated flattened protomerite with its digitiform processes, but 

 has rather a high irregular cylindrical protomerite with an eccentric, 

 conical, forwardly directed projection. Moreover, the deutomerite is 

 quite different in shape from that of Z>, rohustus (compare Figures 29 

 and 47) and the nucleus in the one species is spherical, in the other ovoi- 

 dal. Balbiani's figure compares favorably with figures of sporonts of 

 Echinomera hispida (Schneider) Labbe in the following respects; a) the 

 eccentrically placed cone at the apex of the animal, b) the shape of the 

 protomerite, c) the shape of nucleus. In the case of E. hispida, the epi- 

 merite persists and the cone is a part thereof. Balbiani's figure shows no 

 epimerite, neither does it indicate the digitiform processes characteristic 

 of the other. For these reasons, I do not wish to regard the two species 

 as identical, but rather to leave the one as indefinitely placed. Its origi- 

 nal position is obviously incorrect ; and the epimerite which is needed to 

 correctly diagnose it not having been discovered, its correct systematic 

 position cannot be determined. Figure 47 is copied from Balbiani's 

 drawing. 



. NINA GRACILIS Grebnecki 



[Figure 30] 



1873 Nina gracilis Grebnecki 1873 : 1 



1887 Pterocephalus ndhUis Schneider 1887 :68-9 



1909 Nina gracilis Leger and Duboscq 1909 :33-68 



Nina : Sporonts solitary, very elongate. Length 4 to 5 mm. Width 

 not given. Ratio length protomerite : total length : : 1 :26 ; width 

 protomerite : width deutomerite :: 1 : 0.1. Protomerite bilater- 

 ally symmetrical, divided into two equal lobes by a perpendicular con- 

 striction, these two lobes widely separated at one extremity to form an up- 

 turned cornucopia. The free upper extremity of each lobe bordered 

 with a longitudinal row of short sharp spines, from which project long 

 thread-like filaments. Deutomerite constricted just below septum then 

 dilated slightly, the lower half regularly cylindrical, and terminating in 

 a short bluntly pointed extremity. Nucleus slightly ovoidal with sev- 

 eral small karyosomes. Csyts spherical. Spores regularly ellipsoidal 

 with one integument, united in chains diagonally. 



Taken at Poitiers and at Grenoble (?), France. Hosts: Scolopen- 

 dra cingulata Latr. (S. cingulata var. hispanica Newp.). Habitat: 

 Intestine. 



