1903.] NATURAL SCIEN'CES OF PHILADELPHIA. 57 



be protomerite plus epimerite was in reality only the epimerite, and 

 that the gregarine is truly a dicystid. 



The deutomerite is described as being composed of very loose and 

 highly vacuolated protoplasm, and the nucleus as showing several kary- 

 osomes. The animal is 700 microns long. 



The host is Rhyncoholus americanus Verrill. The parasite occurs in 

 one worm in ten, and rarely more than eight were found in any one host. 



Porter makes the suggestion that gregarine locomotion "is probably 

 caused by a very slight undulatory motion of the under side of the 

 animal." I regret having been unaware of this suggestion, which ac- 

 cords with my own opinions, at the time I wrote my article on gregarine 

 progression. 



Bibliography. 



Bt'TSCHLi, O., 1S81. Kleine Beitriige ziir Kenntniss der Gregarinen. Zeit. f. 



wiss. Zool., Bd. 35, pp. 3S4-409, Taf. 20 u. 21. 

 Fraxtzitjs, Al., 1848. Einige nachtragliche Bemerkungen iib er Gregarinen 



Arch. Naturgesch., 14 Jahrg., Bd. 1, pp. 188-197, Taf. 7. 

 Leidy, Joseph, 1848-49. Proc. Acad. Xat. Sci. of Phila., Vol. 4, p. 231 (verbal 



communication) . 

 Leidy, Joseph, 1851. Proc. Acad. Xat. 8ci. of Phila., Vol. 5, pp. 208, 287. (verbal 



communications). 

 Leidy, Joseph, 1853. On the Organization of the genus Gregarina of Dufour. 



Trans. Amer. Phil. Society, Vol. 10, N. S., pp. 233-241, Pis. 11, 12. 

 Leidy, Joseph, 1856. Proc. Acad. Xat. Sci. of Phila., Vol. 8, p. 47 (verbal com- 

 munication). 

 Leidy, Joseph, 1881. The Parasites of the Termites. Jour. Acad. X'at. Sci. of 



Phila., Vol. 8, Second Series, pp. 425-447, Pis. 51, 52. 

 Leidy, Joseph, 1889. Proc. Acad. Xat. Sci. of Phila., 1889, pp. 9-11 (verbal 



communication) . 

 Leger, L., 1892. Eecherches sur les gregarines. Tabl. Zoologiques, t. 3, pp. 



1-182, 22 PI. 

 Marshall, W. S., 1893. Beitriige zur Kenntniss der Gregarinen. Arch. Xatur- 



gesch., Bd. 1, pp. 25-44, Taf. 20, 21. 

 Porter, J. F., 1897. TrichonA'mpha, and other Parasites of Termes flavipes. 



Bull. Museum Harvard, Vol. 31, pp. 45-68, 6 PI. 

 Porter, J. F., lS97a. Two Xew Gregarinida. Jour. Morph., Vol. 14, pp. 1-20, 



Pis. 1-3. 

 Schneider, Aime, 1875. Contributions a I'histoire des Gregarines des Inverte- 



br^s de Paris et de Roscoff. Arch. Zool. exper., 4, pp. 493-604, 7 PI. 

 Schneider, Aime, 1882. Seconde contribution a I'etude des Gregarines. Arch. 



Zool. exp^r., 10, pp. 423-450, PI. 13. 

 SlEBOLD, Th., 1839. Beitriige zur X'aturgeschichte der wirbellosen Thiere. 



Ueber die zur Gattung Gregarina gehorigen Helminthen. X^^eueste Schriften 



der naturf. Ges. in Danzig., Bd. 3, Heft 2, pp. 56-71, Taf. 1-3. 

 Stein, Fr., 1848. L'eber die Xatur der Gregarinen. Miiller's Archiv, pp. 



182-223, Taf. 8. 

 Wolters, M., 1891. Die Conjugation und Sporenbildung bei Gregarinen' 



Arch, fiir mikr. Anat., Bd. 37, pp. 99-138, 4 Taf. 



