232 fOct. 



with delicate, parallel, longitudinal lines, (muscular 7) and filled with a fine 

 granular matter, obscuring one or two nucleolo-nucleated-organic cells. Su- 

 perior cell placed in a depression of the inferior, surmounted by a slight 

 papilla in which may be detected two lines, apparently outlines, of an oral canal 

 to the interior ol the cell which is filled with granular matter ; cell wall amor- 

 phous and transparent. 



Grtgarina larvatx. Body opaque white, cylindrical or fusiform, frequently 

 considerably dilated at the middle of the upper third. Superior cell a flat- 

 tened or depressed sphere, received about one-half into a depression of 

 the inferior cell, surmounted by a papillary elevation with traces of a com- 

 munication with the exterior; interior filled with a finely granular mass re- 

 sembling oil globules, and measuring from l-lCjOOOth to 1-7, 500th in. Length 

 of cell, in smallest individuals l-123d in.; in largest l-80th by l-61st in. 

 broad. Inferior cell elongated, cylindrical or fusiform, not communicating 

 with the exterior nor with the interior of the superior cell ; filled with a 

 mass of granules resembling that of the superior cell, rendering the larger indi- 

 viduals opaque, but translucent in the smaller ones, and usually obscuring one 

 or two comparatively large nucleolo-nucleated-organic cells, measuring from 

 l-888th to l-.308th in. in diameter. Cell-wall marked with exceedingly regular, 

 delicate, longitudinal, parallel lines about l-9375th in. apart, apparently muscular 

 in character. 



Length from l-160th to l-;)Oth in., by l-8.30th to l-lUth in. in breadth. 

 Habitat. — Found in numbers of from half a dozen to over a hundred, in the 

 ventriculus of Julus marginatus. 



Gregarina is probably the larva condition of some more perfect animal, but in the 

 116 individuals of Julus which I have examined, 1 have not been able to detectany 

 form which could be derivable from it. Creplin doubts itsanimality.' When 1 first 

 discovered thisbody, thinking it to be a larva, I did not examine it carefully, and it 

 was not until some time afterward when, being desirous of ascertaining its true na 

 tare, upon examining some fresh specimens beneath the microscope, I detected 

 movements of an animal character, and this led me to seek for muscular structure, 

 which resulted in the discovery of the longitudinal lines of the inferior cell. 

 These escaped the observation of Siebold, for he says, " Nach meine Beobach- 

 tungen bestehen die Gregarinen aus einer harten glatten den Eihiillen der Insek- 

 ten-Eier ahnlichen Haut."t The movements of the animal are exceed 

 ingly sluggish, and consist of a very slow bending in any direction of 

 any part of the inferior cell, most usually above the middle, rarely at the 

 inferior extremity, but most frequently near the superior cell which is en- 

 tirely passive. The superior cell is also frequently drawn or contracted 

 within the inferior, and again protruded by the contraction of the latter, and the 

 propulsion of the granular contents against it. The inferior cell is also frequently, 

 more especially in younger individuals, intussuscepted within itself through a 

 partial contraction; and again relieved by a general contraction of the cell-wall. 



•Nachtrage zu Gurlt'sVerzeichness der Thiere bei welchen Entozoen gefunden 

 worden sind. Wiegmann's Archiv, 1846, 1 Band, S. 157. 

 fVViegmann's Archiv, 1838, 2 Band, S. 308. 



