252 BEATRICE WHITESIDE 
phatici is thus only an external one. Between the two lies the 
vena spinalis dorsalis duralis. 
The calcareous sacs (fig. 10) have been described by Len- 
hossék (86). My results confirm his statements, except for 
his description of the position of these structures. According 
pr. ase. an. 
pr asc. an. 
hem.cer._, 
13 
Vig.13 Dorsal view oflarva (Stage IV.) dien., diencephalon; hem. cer., 
hemisphaerae cerebri; pr. asc. an., proscessus ascendens anterior; p. spin., partes 
spinales of saccus endolymphaticus; sp.c., spinal cord. 
Fig. 14 Dorsal view of larva. (Stage V.) 
to him, they cover only the proximal part of the ganglion, whereas 
my sections show that they envelop the whole ganglion. Len- 
hossék writes that the sacs lie inside the fibrous capsule belong- 
ing to the ganglia. This capsule sends septa of connective 
tissue into the interior of the sacs. There is also a thin continua- 
