TEREBRATULA,. 
PLATE 
Species 29. (Mus. Cuming.) 
TEREBRATULA (BoucHarpiA) Cuminert. Ter. testd sub- 
pyriformi-ovatd, crassd, margine flecuosd, albida, 
roseo tincti, rostro acuminato-producto, parum incurvo, 
foramine parvo, integro, terminali, deltidio obsoleto, 
ared impresso-concavd, subrugosd; valvis equaliter 
convevis, lateribus intus callosis ; apophyse dupliciter 
affixd, septo amplo, anchorali, calloso. 
Cumine’s Boucwarpra. Shell somewhat pyriformly 
ovate, thick, flexuous at the margin, whitish, tinged 
with rose, beak acuminately produced, but little 
incurved, foramen small, entire, terminal, deltidium 
obsolete, area impressly concave, rather rough; valves 
equally convex, sides callous within; loop doubly 
attached, septum large, anchor-shaped, callous. 
Lerebratella ? Cumingii, Davidson, Pro. Zool. Soc. 1852, 
p. 78. pl. 14. f. 10 to 16. 
Magas Cumingii, Gray. 
Hab. New Zealand. 
An interesting form of Zerebratula, in which the sub- 
generic characters of Bouchardia commence to be indicated. 
The beak is produced acuminately and scarcely incurved, 
the foramen being terminal, whilst the place of the del- 
tidium is occupied by a rough impressly concave area, in- 
to which the dorsal valve hinges with a firm grip. The 
anchor-shaped septum and inner sides of the valves show 
the typical beginning of the callous structure, which is de- 
veloped to a further extent in Bouchardia fibula, and in a 
more extreme manner in Bouchardia tulipa. 
Speces 30. (Fig. a, 6, Mus. Brit.) 
TEREBRATULA (BOUCHARDIA) FIBULA. Ter. testé or- 
biculari-ovatd, solidd, levigatd, albidd, roseo tinctéd, 
rostro amplo, trigono-acuminato, erecto, foramine 
parvo, terminali, deltidio obsoleto, ared perampld, 
pland; valvis subequaliter convexis, lateribus intus 
callosis ; apophyse dupliciter affixd, septo calloso-an- 
chorali. 
THE BuTTON Boucuarpia. Shell orbicularly ovate, 
solid, smooth, whitish, tinged with rose, beak large, 
triangularly acuminated, erect, foramen small, ter- 
minal, deltidium obsolete, area very large, flat; valves 
nearly equally convex, sides callous within; loop 
doubly attached, septum callously anchor-shaped. 
Hab. Bass’s Straits, South Australia; Calvert. 
\WA00K, 
This remarkable shell was lately purchased for the 
British Museum, of a dealer in the neighbourhood, Mr. 
Calvert, who reports that he dredged it in Bass’s Straits, 
from a depth of 200 fathoms. This statement must, how- 
ever, be received with caution. On mentioning it to Mr. 
Milligan, of Hobart Town, Secretary of the Royal Society 
of Tasmania, who happens to be at this moment in Eng- 
land, he assured me that Bass’s Straits had been fully 
sounded by Captain Stokes, and that he did not find it 
deeper in any part than from 70 to 78 fathoms. The 
shell is curiously intermediate between Bouchardia Cu- 
ming and tulipa. The beak is more flatly acuminately 
produced than in the former, while, like the latter, the 
sides about the region of the hinge, and the septum, appear, 
so far as I have been permitted to examine them, to be 
largely callous. The valves are so firmly hinged together 
that it would be impossible to separate them without con- 
siderable injury to the specimen. After soaking it in 
water, with the care and assistance of Dr. Baird, the 
valves opened to about the 16th of an inch, sufficient to 
allow of the callous structure of the interior being 
tained, but not sufficient to justify a drawing being 
ascer- 
made. 
Species 31. (Fig. a, 6, Mus. Cuming; 
Taylor.) 
TEREBRATULA (MaGaAs) VALENCIENNESIT. Ter. testa 
ovata vel flabelliformi, depressiusculd, radiatim costata, 
costis subdistantibus, tripartitim fluctuatis, versus um- 
bonem sepe evanidis, vividée aurantio-rubrd, rostro tu- 
Vig. c, Mus. 
mido, planiusculo, foramine amplo, deltidio interdum 
partito; valvé dorsali planiusculd, ventrali medio 
tumidula ; apophyse reflexd, septo utrinque lamellato, 
subanchorali. 
VALENCIENNES’ Macas. Shell ovate or fan-shaped, 
rather depressed, radiately ribbed, ribs somewhat 
distant, flowing in three fasciculi, often fading to- 
wards the umbo, bright orange-red, beak swollen, 
rather flat, foramen large, deltidium sometimes di- 
vided; dorsal valve rather flat, ventral valve a little 
swollen in the middle; loop reflected, septum lamel- 
lated on each side, slightly anchor-shaped. 
Waltonia Valenciennesii, Davidson, Ann, and Mag. Nat. 
Hist., 1850, pl. 15. f. 1. 
Terebratella Hvansii, Davidson. 
Magas Evansii, Gray. 
February, 1861. 
