TEREBRATULA. 
Puarrt V. 
Fig. 17. (Mus. Cuming.) 
TEREBRATULA (TEREBRATELLA) Boucwarpil. Ter. 
testd suborbiculari, crassiusculd, sordide flavescente, 
subrugosd, tripartito-flexuosd, rostro suberecto, subtus 
utringue concavo-depresso, foramine amplo, deltidinm 
subamplo, subpartito; valvd dorsali medio subdepressa ; 
apophyse elongatd, dupliciter affiad. 
Botcnarpd’s TEREBRATELLA. Shell somewhat orbicular, 
rather thick, dull-yellowish, rather rough, tripartitely 
flexuous, beak somewhat erect, concavely depressed 
beneath on each side, foramen large, deltidium rather 
large, a little divided ; dorsal valve slightly depressed 
in the centre; loop elongated, doubly attached. 
Terebratella Bouchardii, Davidson, Ann. and Mag. Nat. 
Hist. 1852, p. 367; Pro. Zool. Soc. pl. 14. f. 4 to 6. 
Hab. > 
This species is founded upon a single specimen of rather 
rude growth in Mr. Cuming’s collection, but there is no 
other form of Zerebratula with the doubly attached loop 
io which it can be assigned. 
Species 18. (Mus. Metcalfe.) 
TEREBRATULA (TEREBRATELLA) surrusa. Ter. testd 
orbiculari, subgibbosd, fuscescente, quasi epidermide 
indutd, carneo-rosco suffust, rostro mediocri, subtus 
utringue concavo-depresso, oblique truncato, foramine 
amplo, deltidio concentricé rugato, medio subpartito; 
valvis medio tumido-convexis, versus marginem subob- 
solete plicato-costatis, costis irregularibus, hic illic 
malleatis ; apophyse dupliciter affiad. 
THE SUFFUSED TBREBRATELLA. Shell orbicular, rather 
gibbous, fuscous as though covered with an epidermis, 
suffused with flesh rose-colour, beak moderate, con- 
cavely depressed beneath on each side, truncated 
obliquely, foramen large, deltidium concentrically 
wrinkled, slightly divided in the middle; valves tu- 
midly convex in the middle, rather obsoletely plicately 
ribbed towards the margin, ribs irregular, here and 
there malleated ; loop doubly attached. 
Hab. ? 
The only species with which this shell has any real affi- 
nity is 7. dorsata; yet after a most patient comparison of 
it with specimens of 7’. dorsata in many varieties cf diffe- 
rent ages, I cannot bring my mind to any other conclu- 
In all the varieties of 7. 
dorsata, among which I include 7. Chilensis, Broderip, and 
T. flecuosa and T. Sowerbyi, King, there is a characteristic 
depression down the middle of the dorsal valve, and the 
valve obtains the form of a tripartite shield, so to speak, 
In 7. suffusa 
there is no indication whatever of this depression; the 
sion than that it is distinct. 
each having its separate fasciculus of ribs. 
valve is unusually convex in the middle, and the ribs are 
peculiarly malleated, interrupted, and irregular. The spe- 
cimen is in good condition, not uniformly stained with 
rose, like young specimens of the rose-coloured variety of 
T. dorsata, but suffused with a characteristic blush of 
flesh-rose, conspicuously so in the interior, and externally 
through a coating, which has very mnch the aspect of a 
fibrous epidermis. 
Species 19. (Mus. Cuming.) 
TEREBRATULA (TEREBRATELLA) LABRADORENSIS. Ter. 
testd orbiculari, subdepressd, pellucido-albd, solidius- 
culd, radiatim costatd, costis subamplis, rostro tumido, 
subtus utringue coneavo-depresso, oblique truncato, 
foramine magno, integro, deltidio amplo, medio sub- 
partito ; valvis ambabus regulariter convexis ; apophyse 
elongatd, dupliciter affiad. 
Toe Laprapor TEREBRATELLA. Shell orbicular, some- 
what depressed, transparent white, rather solid, ra- 
diately ribbed, ribs rather large, beak swollen, con- 
cavely depressed beneath on each side, obliquely trun- 
cated, foramen large, entire, deltidium large, slightly 
divided in the middle; both valves regularly convex ; 
loop elongated, doubly attached. 
Terebratula Labradorensis, Sowerby, Thes. Conch. vol. i. 
p. 362. pl. 71. f. 89, 90. 
Terebratella Labradorensis, Davidson. 
Hab. Labrador ; Goodsir. 
A rather depressed transparent white orbicular species, 
of solid structure, ribbed with more strength and regula- 
rity than is common in the genus. 
Species 20. (Fig. a, 6, Mus. Cuming.) 
TEREBRATULA (TEREBRATELLA) CRUENTA. Ter. testd 
subtrigono-globosd, inflata, tripartito-flecuosd, medio 
depressit, aurantio-cruentd, ad lineas incrementi intensé, 
November, 1860. 
