1903.] NATURAL SCIENCES OF PHILADELPHIA, 49 



■? Gregarina harpali sp. n. PI. I, figs. 1-4. 



Epimerite: Not seen. 



Protomerite: In the adults (fig. 1) hemispherical and narrower than 

 the deutomerite, from which it is separated by a sharp, but not exten- 

 sive, constriction. In the young (figs. 2 and 3) knob-shaped, wider 

 than the deutomerite and separated from that part by a shallow con- 

 striction. 



Deutomerite: Conical in the adults to C3dindrical in the young. The 

 posterior end is normally blunt and rounded. These gregarines, how- 

 ever, are quite polymorphic and readily change shape. 



Epicyte: Relatively very thin in the adults. INIarked with very fine 

 longitudinal ridges, which are not visible in the living animals and 

 require sections for their demonstration. 



Sarcocyte: Not visible in adults. In the young (fig. 3) present in the 

 protomerite and constituting the thick septum. Apparently wanting 

 in the rest of the deutomerite. In the front part of the protomerite a 

 little papilla is present, apparently composed of a differentiation of the 

 sarcocyte. This papilla is much more evident in some specimens than 

 in others, and sometimes takes the form of a minute knob. It was 

 never seen in adult animals. 



Entocyte: Black in transmitted light in the adults, semi-transparent 

 in the young, but in both as dense in the protomerite as in the deuto- 

 merite. In the young, as shown in fig. 3, there is a crescentic area 

 almost free from granules. In stained and sectioned animals (fig. 4) 

 this crescentic area is seen to consist of very dense cytoplasm, with a 

 considerable affinity for stains. This condition is wholly lost in the 

 adults. 



Nucleus: In the living animals, wholly invisible in the adults and not 

 satisfactorily to be made out in the young. Sectioned material shows 

 that it is large, spherical, and possesses several karyosomes. These 

 are variable in size and are scattered singty throughout the entire extent 

 of the nucleus. The}^ display the usual phenomenon of vacuoles. 



Movements: The movements displayed by these gregarines were 

 leisurely muscular contractions and slow progression. There was also a 

 disposition to rumple the edges of the body, so that the epicyte of the 

 deutomerite presented a series of scallops. These scallops underwent 

 slow changes, the movement being doubtless the usual peristalsis, 

 although very much slower than in the case of most gregarines. Pro- 

 gression was in either more or less of a straight line, or in curves of short 

 radius. In the latter case, the animals held their bodies so Ijent that 

 the longitudinal axis formed a curve. In all cases progression was 

 4 



