TEREBRATULA.—Ptratr X. 
Hab. Mediterranean (affixed to corals, at a depth of from 
fifty to a hundred fathoms). 
Remarkable for its semicircular wedge-like form, arising 
from the beak of the ventral valve being thrown back by 
a broad concavely truncated area in which the foramen is 
conspicuously large. The apophysis is peculiar. It com- 
mences, as in most of the subgenera, with a lobe springing 
from on either side of the hinge, but, instead of being free, 
converging towards a central septum, it takes a sweep 
round the margin of the dorsal valve, contiguous with the 
shell, in connection with three prominent short radiating 
marginal tooth-like septa. 
Species 44. (Mus. Cuming.) 
TEREBRATULA (ARGIOPE) CUNEATA. Ter. testa subtri- 
gono-circulari, cuneiformi, albidd aut rufescente, ra- 
diatim obsolete costatd, inter costas vividée aurantid, 
rostro amplo, tumido, ared parum truncata, foramine 
peramplo, deltidio viv nullo, valvis modicé convexis, 
ventrali ad rostrum conspicué tumido-productd ; apo- 
physe ad cardinem utrinque lobatd, septo dentiformi 
unico prope marginem anticam. 
THE wepGep Areiorn. Shell somewhat triangularly 
circular, wedge-shaped, whitish or reddish, radiately 
obsoletely ribbed, bright-orange between the ribs, 
beak large, swollen, area but little truncated, foramen 
very large, deltidium rudimentary, valves moderately 
convex, the ventral conspicuously tumidly produced 
at the beak; apophysis lobed on each side at the 
hinge, with a single tooth-like septum near the front 
margin. 
Terebratula cuneatu, Risso, Hur. Mérid. pl. 4. f. 179. 
Anomia Pera, Mihifeldt. 
Orthis Pera, Philippi. 
Terebratula Soldaniana, Risso. 
Argiope cuneata, Davidson. 
Hab. Mediterranean (at depths of from thirty to seventy 
fathoms). Canaries. 
A narrower form than the preceding species, in which 
the lobed apophysis, sweeping round the dorsal valve, is 
supported near the margin with only one short tooth-like 
septum. The beak is more tumidly produced, and the 
hinge area, consequently, is less abruptly truncated. 
Species 45. (Fig. a, 6, Mus. Cuming.) 
TEREBRATULA (ARGIOPE) NEAPOLITANA. Ter. testa tri- 
gono-orbiculari, versus marginem plicato-indentatd, pel- 
lucido-albaé aut fuscescente, radiatim obsoleté costatd, 
rostro subtrigono-producto, ared modice truncatd, 
Joramine amplo, deltidio utrinque emarginato, valvd 
dorsal, planiusculd, indentatd, ventrali tumido-con- 
vexd; apophyse ad cardinem utringue lobatd, septo den- 
tiformt unico prope marginem, marginibus intus un- 
dique crassatis et denticulato-serratis. 
Tue Neapouiran Arciopr. Shell triangularly orbi- 
cular, plicately indented towards the margin, trans- 
parent-white or brownish, radiately obsoletely ribbed, 
beak rather triangularly produced, area moderately 
truncated, foramen large, deltidium emarginated on 
either side, dorsal valve rather flat, indented, ventral, 
tumidly convex; apophysis lobed at the hinge on 
each side, with a single tooth-like septum near the 
front margin, margins thickened and denticulately 
serrated within throughout. 
Terebratula Neapolitana, Scacchi, Oss. Zool. vol. ii. p. 
18. 
Terebratula seminulum, Philippi. 
Orthis Neapolitana, Philippi. 
Argiope Forbesii, Davidson. 
Argiope Neapolitana, Davidson. 
Hab. Mediterranean (at depths of from sixty to a hundred 
fathoms) ; Canaries. 
This is of a more triangular form than the preceding 
species, and the valves are plicately indented towards the 
margin in a very characteristic manner, the ribs, which are 
scarcely discernible, being arranged in three fasciculi, or 
on three shields as it were. The apophysis is the same 
as in Argiope cuneata, but the margin of the valve is 
more thickened within, and between it and the loop there 
is a distinct row of spinous teeth. 
Species 46. (Mus. Cuming). 
TEREBRATULA (ARGIOPE) CISTELLULA. er. testd trans- 
versim ovata vel subquadratd, antice subindentatd, sub 
lente minutissime granulosa, fulvd, interdum fuscescente, 
rostro brevi, ared truncata, foramine peramplo, del- 
tidio vix nullo, valvis subequaliter convewis, ventrali 
tumidiore ; apophyse ad cardinem utrinque lobatd, 
septo dentiformi unico prope marginam anticam. 
THE LITTLE CASKET ARGIOPE. Shell transversely ovate, 
or somewhat square, a little indented in front, be- 
neath the lens very minutely granuled, fulvous or 
brownish, beak short, area truncated, foramen very 
large, deltidium rudimentary, valves nearly equal, 
ventral the more swollen; apophysis lobed at the 
