29 
until it reaches the vicinity of the lateral bands, corresponding to 
what was observed in two worms cleared in glycerine (fig. 15). On 
the nucleated side of the bridge the stud}^ was less satisfactory, but 
dorsad of the nucleus a thick walled canal-like structure was observed 
in several sections (fig. 17). 
On surface views a large, distinct, and rather remarkable nucleus 
is also visible; this is situated slightly cephalad of the point of union 
of the glands and appears to be unilateral; at least, in no specimen, 
either on surface view or in section, could two such nuclei be distin- 
guished. This fact, that onl}- one nucleus could be found, is strongly 
indicative of an interpretation that the two glands together represent 
in reality only one cell. As the nucleus found was very distinct, it is 
difficult to assume that the absence of a second nucleus was due to the 
condition of the material. 
This nucleus varies slightly in shape, but, in general, it is much 
longer than broad; it ma}^ attain a measurement of 296 to 316yw long 
(parallel with longitudinal axis of body) by 90 to 132yw broad (trans- 
Fig. 23. 
Fig. 24. 
verse to longitudinal axis of bod}^). Both in mounts of the entire 
worm and in sections, the nucleus presents a thick nuclear membrane 
and a content of exceedingly large granules. Its appearance is very 
suggestive of the large nuclei of the cephalic glands of Agchylostoma 
duodenale (see especially Looss, 1905, figs. 5 and 38). 
From the foregoing description it will be seen that the glandular 
structures do not correspond closel}", so far as could be observed, 
with the conditions described by Looss (1905) for Agchylostoma duo- 
denale. While recalling the unsatisfactory condition of the material, 
it is seen that no true distinct systems of cephalic and cervical glands 
have been observed, and that what would seem to correspond to the 
head glands of Agchylostoma duodenale^ judged from their position in 
respect to the lateral bands, and. from the large nucleus, appear to 
discharge through the excretory pore; further, that the two sides of the 
animal are not symmetrical in respect to these structures. Further 
study is, of course, advisable on material in better condition. 
