224 Henry LesLie Osporn, 
The interior of the spermary is free and open, lacking the 
stroma of connective tissue found in some trematodes, as for example 
Holostomum (Looss, 1897), where the wall gives off branches to the 
interior. The organ contains numerous detached cells (Figs. 42—47) 
of various appearance, including certain enlarged cells (42) with 
abundant cytoplasm and nucleus with distinct chromatine loop and 
no nuclear membrane and other cells of similar size and cytoplasm 
but containing several masses of chromatine more or less distinctly in 
the skein stage. These cells are found generally near the wall of 
the organ, that numbered 42 was in contact with the wall by the 
side of a cell like 41 which is drawn with the same magnification. 
Besides these cells there are groups made up of radially placed 
and imperfectly separated cells, some with fewer larger cells others 
with double the number of smaller cells. Still other central masses 
have the appearance of 47, the chromatine being elongated and in 
some cases drawn out into a thread extending beyond the contour 
of the cell. The course of development of the spermatozoa is here 
evidently much like that of flat worms in general (SCHNEIDER, 1902, 
p. 308) and of other trematodes, SALENSKY (1874), Scowarrz (1885), 
Wricut & MacazLum (1887), Hecxert (1889) and Orro (1896). The 
wall cells swell and become large multi-nucleate spermatogones, 
these by radial cleavage, analogous to centrolecithal cleavage in 
arthropod ova, produce the groups of spermatocytes, In a way 
appearently bearing considerable resemblance to that described by 
Cazxins (1895) for Lambricus. My studies do not permit of any 
detailed study of the history of the spermatozoon. It is rather 
strange too that in no case have I found in the summer material 
or that studied in the early spring any supply of spermatozoa stored 
in the animal. The spermatic vesicle is in some instances very 
much enlarged but I have not in any instance been able to find it 
filled with spermatozoa or even containing any, nor are recently 
formed spermatozoa still present in the spermary as in many other 
trematodes. 
The sperm-duct is very slender, leaving the anterior side of the 
spermary, it crosses the body ventrally to the intestine and enters 
the side of an enlarged passage, the seminal vesicle, which continues 
to the cirrus sack. This distinction of the passage from the spermary 
into a sperm-duct and a seminal vesicle does not exist in C. lenorri, 
according to POIRIER, but it is found in Aspidogaster conchicola, where 
however the duct enters the end and not the side of the vesicle. 
