226 [Oct. 



Length of full grown individual 2 to 3 sometimes 4 lines. 



Habitat. Grows from the basement membrane of the mucous membrane of the 

 small intestine of Julus marginatus, Say, occasionally from the same membrane 

 at the commencement of the larjie intestine, and also from any part of the 

 exterior surface of Ascaris infecta and Aorurus : entozoa infesting these portions of 

 the intestinal canal of this animal. 



The youn;;e<t individuals of Enterobrus which T ever detected, measured l-3S0th 

 of an inch in length by 1-lOGOth in breadth, but the most usual sizes vary from 

 the l-150th of an inch to the full grown individual. At all ages they contain the 

 same character of contents, but in the younger ones, the large globules are usually 

 predominant, sometim !s to such an extent as to exclude the other matters. When 

 quite young they are usually more or less clavate and straight, a little more ad- 

 vanced they form a gentle curve, about one eighth of a circle. A little older, the 

 distal half or third becomes uniformly dilated, and forms an obtuse angle with 

 the other portion; after this as it continues growing, it usually forms a single spi- 

 ral turn, becomes uniformly dilated, and thus advances to the full grown individual. 

 The cell contents consist principally of large transparent globules with granules 

 and protoplasma in the interstices. Frequently the cells are found distended with 

 the globules to such an extent that the other matters almost, and occasionally 

 even entirely disappear. Iodine turns the protoplasma and granules deep yellow 

 or very deep brown, and causes the rupture of the globules, when a clear fluid is 

 observed to exude; veiy slightly colored purplish, or undergoing no change of 

 color from the iodine. Solution of iodine, acetic acid, salt water, or 

 the prolonged action of water alone, causes a contraction of the cell contents from 

 the sides of the permanent cell wall, but they arc still held together by an appa- 

 rent delicate membrane of the character of a primordial utricle. Frequently in 

 dead individuals, the interior contents shrink to two thirds, occasionally to one 

 third the diameter of the cell calibre, and almost 8 to 20 times the diameter of the 

 cell from each extremity, when they have the appearance of a shrivelled granular 

 membrane. In these latter cases the characteristic globules and granules have 

 disappeared, and their place is more or less occupied with water, and yellowish 

 globular, highly refractive bodies, which resemble oil. These latter globules 

 vary in size from a mere point up to one fourth the diameter of the cell. The 

 smaller ones are contained within the shrivelled primordial utricle with a few of 

 the larger ones, and a number of the latter occupy a position between the pri- 

 mordial utricle and the cell wall apparently formed by a conjunction of the 

 smaller globules and an exudation through the primordial utricle during the act 

 of contraction consequent upon decomposition. They are insoluble in alcohol, but 

 are soluble in ether and a solution of potassa; in fact in all their properties they re- 

 semble oil. Can these be oil globules the result of decomposition ? 



The protoplasma or fluid of the cells is colorless or faintly yellowish, contracts 

 or coagulates upon the application of alcohol, and is colored brown by iodine, 

 having all the characters usually possessed by that albuminoid fluid found in all 

 young vegetable cells and denominated protoplasma by H. von Mohl. 



The clear granules are minute, yellowish and resemble fine oil globules. They are 

 turned deep brown by the action of iodine. 



The clear globules appear to consist of a delicate vesicular membrane probably 

 derived from the primordial utricle, filled with a colorless fluid. 



