APPENDIX—HYALINIA CELLARIA. 461 
The ALIMENTARY SYSTEM presents no special features, but Mr. Bowell states 
that the SALIVARY-DUCYS are long and twisted. 
The BUCCAL MASS resembles that of V. hibernica, ut is more oblong; the JAW 
-has a not very prominent beak ; the short ELASMA is connected with the maxilla 
ENTE \ 
»S 
BiG. 333, Pic. d3h. 
Fic. 532.—Frontal aspect of the mavilla or jaw of //. scharxfi x 25 (after Bowell). 
Fic. 533.—Under aspect of the maxilla or jaw of //. scha- fi * 25 (after Bowell). 
Fic. 534.—Rear view of the maxilla or jaw of //. scharfi X 25, showing the projecting dark area of 
muscular attachment (after Bowell). 
muscle, while the large muscle to the maxilla has a sheath marked by regular 
transverse striation, 
The RADULA, in Mr, Bowell’s opinion, is probably suflicient for identification ; the 
points being the small number of 
Inarginals, seven or eight as 
against ten or twelve usually 
found in the species of the group; 
juveniles of cellaria might have 
only seven or eight, but their 
centrals and laterals are of an 
easily recognizable type. The 
shortness of the eusps so that the 
rows hardly overlap is another 
feature. The transitional or third 
lateral is only distinguishable 
from the marginals by a very 
slight bieuspidation. The median 
teeth resemble those of Vitrea 
hibernica and the general con- 
figuration of the basal plates is 
also similar. The radular varia- 
tion seen is in the form of acces- Fic. 685.—Half a transverse row of the radula of 
3 /1. scharffi (highly magnified) after Bowell. 
sory endocones to the median 
teeth ; central and first lateral fused; second lateral with bifid endocones. In two 
specimens the marginals were mueh shorter than figured, and huddled together, 
after the fashion of the true nitidula. 
INTERNALLY, in the REPRODUCTIVE or SEXUAL SYSTEM of this sub-variety the 
OVOTESTIS forms in the specimen figured a voluminous mass, with four or five duets ; 
Sh 5 ‘at 
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AMS Bae: ee. 
a RAL 5 We 
py eee, ES ng fy 
Vice 
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Fic. 536. Fic. 537. 
Fic. 536.—Reproductive organs of //yalinia scharfi (after Bowell), reduced from the original figure. 
Fic. 537.—Alimentary system of //. schar-fi, showing the heart and renal organ, the digestive gland, 
the buccal bulb, retractor muscle, etc. (after Bowell), reduced from the original figure. 
the HERMAPHRODITE DUCT is very long and wide, and but little convoluted, and 
apparently provided with valves in its course formed by a kind of intussusception ; 
