722 The American Naturalist. [ August, 
Summarizing his facts he states that the cycle of the Coccidium is as 
follows: 
“ Eimerian sporozoid, encapsuled form, tetra-spored cyst (Coccidium), 
Coccidian sporozoid (that enters the host), eimerian bud-group, and 
then the Eimerian sporozoid. 
In a promised paper the author expects to show the relation between 
a coccidium and a gregarine, but not by an identification with a moro- 
cystial as Mingazine has attempted to do nor by a doubling of the cycle 
as Schneider did, but by considering the Eimerian sporozoid as equiva- 
lent to the gregarine sporo-blast and the lasting tetra-spored cyst of a 
Coccidium as the analogue of the gregarine spore. 
The Nephridia of the Nemertine, Stichostemma eilhardi 
Montg.—A brief paper on this subject by Dr. Montgomery contains 
some very striking facts, which have a somewhat important bearing 
upon the weight to be given nephridia in constructing phylogenetic 
trees. Asa case in variation the worm described simply adds another 
example to those that have been accumulated showing that the forms 
of animals, of plants, the number of various portions of their anatomy, 
ete. are much less fixed and regular than has been previously supposed. 
This particular worm we are informed differs from all other known 
nemerteans (1) in having several consecutive nephridia on each side of 
the body instead of a single pair as is the case in others forms; (2) in 
the fact that not all of the nephridia are provided with excretory ducts ; 
(3) in the nephridia extending from one end of the body to the other ; 
(4) in the great number of excretory ducts; (5) in the cavity of the 
terminal bulbs being closed and hence not in open communication with 
the lumen of the ductules ; (6) in the presence of a closed cuticular 
structure surrounding the cavity of the bulb which may be produced 
by the cells of the latter; (7) in the probable absence of a ciliary flame 
in the bulb ; (8) in the comparative great length of the ductule con- 
necting the bulb with the main duct; and (9) in the possession by the 
epithelium of the main ducts of a cuticula of considerable thickness. 
No evidence of a connection between the nephridia and the blood 
vessels was found. 
The peculiar features of the animal the author seeks to explain as due 
to the adaptation of the ancestors of the worm from a marine to a fres! 
water life. There is a question, however, as to whether such a cause 18 
properly assumed for the peculiarity of consecutive nephridia instead 
of the single pair found in all other nemertines, and for the irregular- 
ities to be noted in the supply of exeretory ducts. As shown by the 
