ANNALES MUSEI NATION ALIS HUNGAKICI. 
1909. 
VII. 
ANATOMY AND SYSTEMATIC POSITION OF 
CAMPY LAKA COERULANS. 
By Dr. L. Soós. 
(With 2 figures.) 
The question of the systematic position of Campylaea coerulans 
C. Pfr. has repeatedly formed a subject for discussion. For the pur¬ 
pose of deciding the matter I have examined the organs which are 
important in regard to the! system, i. e. the jaw, the radula and the 
reproductive system. The result of my researches is as follows. 
1. Jaw. The jaw (fig. 1) is to be found in a groove behind the 
opening of the mouth, and is composed of two coalesced, thin, flexible, 
quite smooth, yellowish chitin-plates. The larger 
of this two plates is arcuated, while the smaller 
one is as it were a tongue-shaped appendix of the 
larger to which it is coalesced on the arcuated 
side. The other edge of the smaller plate curves 
freely back brimlike, and therefore inclines in 
the direction of the arcuated edge of the larger. 
These are the two gnawing edges. The motor- 
muscles being fastened to the two plates in the intervening place. It 
is well known that the jaw of the Campylaeae is always a thick, 
strong, scarcely flexible, dark-broAvn ckitin-lath, upon which 4—11 ribs 
are to be found. The jaw of C. coerulans differs therefore considerably 
from that of the Campylaeae. 
2. Radula. The radula of C. coerulans or rather its teeth 
are of a quite peculiar structure, and there is among the Helicidae 
only one species which has such radula-teeth, i. e. AMognath/us Grate- 
loupi Graëlls, as is knoAvn from the researches of Schuberth. The 
teeth of the radula of C. coerulans are uniform in shape and they 
are narrow, strap-shaped, sicklelike curved backwards, and their ends 
are rounded off. The teeth are arranged in wavy-lines ; their number is 
not even approximately determinable though in any case there are 
many thousands. 
3. Reproductive system. C. coerulans has genitalia of the 
Fig. 1. 
Jaw of H. coerulans. 
