1007.] NATURAL SfTFA-CES OF PHILADELPHIA. 225 



fairly extensive changes of shape. Such changes, however, were 

 always effected very slowly. They also progressed in curves and 

 straight lines, but in a most leisurely manner. 



Host. — Mela nop! us femoral us (Burm.). 



Locality. — Wyncote, Pennsylvania. 



As with his G. achcloe-abbreviatoe, so with his G. locustoe-curolinaz , 

 Leidy (1853) seems to have described two species under one name. 

 ]\Iy observations of the summer of 1906 show that the host in question, 

 Dissostcira Carolina (L.), then known as Locusta Carolina, is infected by 

 two gregarines. One of these is in all probability a true Gregarina, 

 and I believe Leidy's figs. 35 and 36 to be representations of it. On 

 the other hand, his fig. 37 is probably a Stephanophora, and it has been 

 placed in that genus by me (Crawley, 1903). The confusion seems 

 best cleared up by retaining Leidy's name for the true Gregarina, and 

 creating a new one for the Stephanophora. The two species are 

 defined below. 



Gregarina looustae-carolinsB Leidy. (PL XVIII, fig. 13.) 



Gregarina locustoE-carolinoe Leidj^ (1853), p. 239, pi. 11, figs. 35, 36. 

 Gregarina locustoe-carolinoe Leidy (185G), p. 47. 

 Gregarina fimbriata Diessing (1859), p. 730. 

 Gregarina locusfoe-carolina; Labbe (1899), p. 35. 

 Stephanophora locustae-carolina; Crawley (1903), p. oi. 



Epimerite. — A small rounded knob, cut off from the protomerite by 

 a very short neck. The epicyte of the epimerite is continuous with 

 that of the protomerite, and does not intervene between the two 

 segments, the boundary between which is formed by the sarcocyte 

 of the protomerite. A small quantity of entocyte is present. 



Protomerite. — Globular in the cephalonts, and nearly so in the 

 sporonts. Posterior boundary plane. 



Deutomerite. — Globular to oval or even cylindrical in the cephalonts. 

 Oval to cylindrical in the sporonts. 



Epicyte. — Shows a double contour. 



Sarcocyte. — In the cephalonts and very small sporonts, well developed, 

 especially in the anterior part of the protomerite. 



Entocyte. — Pale. This applies to the young animals; my notes 

 being silent as to its condition in the adults. 



Nucleus. — Large, with one large karyosome. 



Size. — The largest animal seen was 350 microns long. The appear- 

 ance of this individual, however, did not suggest full maturity. The 

 cephalonts were 100-110 microns long. Decapitation takes place 

 early. Quite a number of small gregarines were seen, all about 100 



