CUCULLAA. 
lato, post angulum convexo-subcomplanato, prope 
marginem cardinalem convero, margine ventrali 
subventricoso ; latere antico brevi, margine car- 
brevitiseulo, dentibus centralibus minutis 
irregularibus striatis ; dentibus terminalibus posticis 
quatuor brevibus, subarcuatis, anticis tribus paulo 
dinali 
longioribus et rectis; auriculd interna septiformi 
musculari angusta ; wmbonibus moderate elevatis, 
obtuse angulatis, 
GRANULOSE CucuLL@s. Shell subquadrate, rather 
thin, ventricose, high, rayed with small, rounded, 
decussated, 
THE 
minutely pitted interstices, whitish, painted with 
brown spots, small before the angle. large and 
angular behind; 
the margin, with a single band upon the auricle; 
posterior side obtusely angular, convex, somewhat 
flattened behind the angle, convex towards the 
cardinal margin, ventral margin subventricose ; 
anterior side short, cardinal margin rather short, 
central teeth minute, irregular, striated ; pos- 
terior terminal teeth four, short, slightly arched, 
posterior, and three a little longer, straight, 
auricle 
narrow; uwmboes moderately elevated, obtusely 
anterior; interior septiform muscular 
angular. 
Jonas. Proc. Zool. Soc. 1846. 
Hab. Chinese Waters. 
The above name is attached in the British Museum 
cases to specimens of the species which I think may be 
identified as C. auriculifera, and which do not at all 
agree with the description by Jonas. The shell here 
figured, which we possess in various stages, agrees per- 
fectly well with that description in all the points men- 
tioned as distinguishing it from the two other species. 
It is thinner, deeper from apex to ventral margin, more 
obtuse at the angle, and convex on the post-angular 
The ligamentary area is also considerably shorter 
and narrower, and the riblets are more distinctly granu- 
lated, with wider and distinctly pitted interstices 
in the front part of the shell. The most 
distinction, however, is found in the terminal teeth 
of the hinge, these, instead of two or at most three 
at each end, are four or five at the posterior end, short 
and arched. 
area. 
reliable 
granulated subduplicate ribs and | 
within white, purple towards | 


Species 38. (Mus. Sowerby.) 
Cuc. testa rhomboided, ob- 
longa, ventricosissimd, crassa, costellis compla- 
natis subtilissimé decussatis subduplicatis radiata, 
anticé prope marginem alba, superne posticeque 
fulvo suffusd, fusco obscwré maculata, versus mar- 
ginem ventralem posticé purpurea ; ints medio et 
posticé fusco-purpured ; latere postico acuté angu- 
lato, post angulum lateraliter complanato ; margine 
vie convexo, ad marginem cardinalem cuneato, 
versus marginem ventralem acuminatim producto, 
CUCULLHA AURICULIFERA. 
antico  sub- 
quadrato, breviusculo ; dentibus centralibus minutis 
margine ventrali convexo ; latere 
wregularibus striatis, dentibus terminalibus utrinque 
duobus elongatis parallelis ; auricula  septiformi 
interna musculari magnd purpurea; umbonibus 
elevatissimis, valdé angulosis. 
AURICULIFEROUS CuctLLma. Shell rhomboidal, 
oblong, very ventricose, thick, rayed with flat- 
tened, very finely decussated, rather duplicated 
riblets, white in front near the margin, suffused 
with fawn colour above and behind, obscurely 
THE 
spotted with brown, purple towards the poste- 
rior ventral margin; within centrally and poste- 
riorly brown-purple; posterior side acutely angular, 
behind the angle laterally flattened, margin hardly 
convex, cuneated at the cardinal margin, acumi- 
nately produced towards the ventral margin; ventral 
margin convex; anterior side subquadrate, rather 
short, central teeth minute, irregular, striated, ter- 
minal teeth two at each end, elongated, parallel; 
umbones much elevated, very angular. 
Lamarck. Anim. S. Vert. 
Hab. Isle of France. 
Although Lamarck included Cucullea concamerata 
in his references for this species, yet his distinguishing 
epithet “Bona” as applied to the figure of the Enc. 
Met. serves to show that the shell before him was the 
present species, those figures being characteristic of our 
shell. It is of a suffused brown colour from the apices 
to the centre, and very dark purple posteriorly within 
and without. The ribs are smoother, the ventral 
margin more convex posteriorly, the internal auricles 
much larger than in either of the above species, and the 
terminal hinge teeth fewer and more simple. 

