60 HYALINTA ALLIARIA. 
Fic. 94. Fic. 98, Bic. 96. Fic. 97. 
Fic. 94,—Alimentary canal of Hyadinia alliaria (Miller), x 6. 
Fic. 95.— Proximal end of the reproductive organs of //yadinia alliaria (Miller), x 6. 
Fic. 96.—Penis-sheath, epiphallus, and the enlarged tract of the vas deferens of Yyadlinia alliaria 
(Miller), x 20 (after a photograph by Mr. W. Moss). 
Fic. 97.—Ovotestis of yalinita alliaria (Miller), x 20. 
The MANDIBLE or jaw is about half-a-mill. from side to side, and in the deseribed 
specimen not thick, strong and dark coloured, but somewhat thin and amber 
coloured ; the shape is almost lenticular, the upper peers, 
margin being well arched, but slightly reeurved at the ee. 
ends ; the lower margin is also sinuously convex, the 
most prominent part being the projecting median beak 
or rostrum. The whole jaw is areuate from front to Fic. 98.—Mandible or jaw of 
back, the rostrum being a somewhat prominent but — //7@@"ta adliaria, x 20, 
smnSTaE he : : ; : S (Coatham, Mr. B. Hudson). 
indistinctly delined vertical ridge, and the line of inser- 
tion in the tissues on the upper margins is clearly shown, but the transverse and 
converging vertical striation is very fine. 
The LINGUAL MEMBRANE is about two mill. long, and about half-a-mill. wide, 
with about thirty-five curved transverse rows of teeth, each row being constituted 
by a small tricuspid median tooth, bearing a long, slender, and well developed 
mesocone with a slightly projecting ectocone at each side ; the two strictly lateral 
or admedian teeth have strong and powerful cutting points to the mesocone and 
endocone, but the ectocone on both these teeth does not show as a single and 
simple cusp, but is distinetly serrate on both teeth, the second admedian showing 
at times a subsidiary ectoconic point ; the third lateral is transitional and has all 
the characters of the aculeate marginals except that a strongly developed endo- 
cone is present ; the marginal teeth are strictly aculeate and vary in number from 
nine to twelve on each side. 
Herr Schepmann, however, in a specimen ascribed to this species, from Nord- 
hausen, represents this transitional tooth as also possessing a distinet ectocone, 
but this feature has not yet been observed in British specimens. 
Fic. 99.—Transverse row of teeth from the odontophore of A/yadinia alliaria (Miller), x 200. The 
animal collected at West Kilbride, Ayrshire, by Mr. A. Somerville, and the palate prepared by Mr. J. W. 
Neville. 
The formula of a Coatham specimen, collected by Mr. Baker Hudson and pre- 
pared by Mr. J. W. Neville, is 
» » ) J — [= 
MO 4424324545442 x 35 = 945. 
Habits and Habitats.— Hyalinia ulliaria is a local and gregarious 
species, and though occasionally found in almost every variety of situation 
is said by Mr. Swanton to be more plentiful on Neocomian strata than any 
of its congeners. It, however, habitually frequents bleaker and more 
