TEREBRATULA.—P are II. 
by some pressure at its place of attachment. No shell has 
been found to correspond with the figure to which Lamarck 
refers in the ‘ Encyclopédie Méthodique,’ and I believe it 
to have been drawn from an old worn specimen like Mr. 
Cuming’s, with the foramen and deltidium eroded, and 
the rude uneven lines of growth exaggerated into regular 
concentric ridges. De Blainville gives Lamarck’s 7. glo- 
bosa, but he does not appear to have had the shell. His | 
figure is merely a copy, with ali its infirmities, of the ‘En- | 
cyclopédie’ figure, on a reduced scale. The immature 
rounded specimen from Mr. Taylor’s Collection, repre- 
sented at Fig. 3 J, has the habitat, “de Coquimbo,” written 
upon it in French. 
Species 4. (Mus. Cuming.) 
TEREBRATULA (WALDHEIMIA) LENTICULARIS. Ter. 
testéd ovato-ylobosd, inflata, flavescente-corned, plus | 
minus vivide miniatd, rostro producto, subacute in- 
curvo, subtus utringque excavato-depresso, foramine | 
parco, deltidio transversim concentrice rugato ; valvis 
levibus, obsolete malleatis, obscurissimé tripartitim 
flexuosis, lineis incrementi rudibus ; apophyse ampliter 
producta et reflead. 
THE LENS-SHAPED WALDHEIMIA. 
bose, inflated, yellowish-horny, more or less brightly 
vermilion-stained, beak produced, rather sharply in- 
curved, excavately depressed beneath on either side, 
foramen small, deltidium transversely concentrically 
wrinkled ; valves smooth, obsoletely malleated, very 
obscurely tripartitely flexuous, lines of growth gene- 
rally rude; loop largely produced and reflected. 
Terebratula lenticularis, Deshayes, Revue Soc. Cuv. 1839 ; 
Mag. de Zool. 1841, pl. 41. 
Hab. Strait of Fauveau, New Zealand (at a depth of fifteen 
fathoms.) 
Shell ovately glo- 
Were it not that the habitats of this and the preceding 
species are well authenticated, it would be difficult to be- 
lieve that there is any specific difference between them. 
This is rather lighter inflated growth, and the colour is 
remarkable, but the characters in other respects are the 
The foramen is probably as 
small as in 7. globosa ; in all the specimens of 7”. lenticu- 
laris that I have seen it is more or less eroded, according 
to the circumstances of its attachment. 
cisely the same in both species. 
same in detail throughout. 
The loop is pre- | 
Species 5. (Fig. a, Mus. Cuming; Fig. 4, c, 
Mus. Metcalfe.) 
JEREBRATULA (WALDHEIMIA) Gray. Ter. testd sub- 
trigono-orbiculari, gibbosd, rudi, radiatim costata, 
costis irreguluribus, subdistantibus, obscuré squamatis, 
versus marginem sepe bipartitis, livido-olivaced vel 
flavescente, costis plus minus vivide miniatis aut san- 
guineo-tinctis, rostro brevissimo, obtuso, foramine per- 
amplo, semper plus minus eroso, deltidio peramplo, 
medio late partito ; valvis valde inequalibus, dorsali 
planiusculd, ventrali valde convext ; apophyse producta 
et reflext. 
Gray's WatpHeErmia. Shell subtriangularly orbicular, 
gibbous, rude, radiately ribbed, ribs irregular, rather 
distant, obscurely scaled, often divided towards the 
margin, livid-olive or yellowish, ribs more or less 
brightly stained with vermilion or blood-red, beak. 
very short, obtuse, foramen very large, always more 
or less eroded, deltidium very large, broadly divided 
in the middle; valves very unequal, dorsal rather 
flat, ventral gibbously convex; loop produced and 
reflected. 
Terebratula Grayi, Davidson, Pro. Zool. Soc. 1852, p. 76. 
pl. 14. f. 1 to 3. 
Hab. Strait of Corea; Belcher. 
In a dozen specimens of this beautiful species now be- 
fore me, in different stages of growth, collected in the Strait 
of Corea by Admiral Sir Edward Belcher during the 
voyage of the ‘Samarang,’ it is curious to observe the use 
of the deltidium in Zerebratula. The foramen of the shell 
naturally becomes more or less eroded and enlarged ac- 
| cording to the roughness with which the creature is buf- 
feted about in its place of attachment; and the deltidium 
in those Zerebratule of which the beak is not much pro- 
duced, is in two pieces, which separate from each other, with 
| the enlargement of the foramen, like a sliding panel. In 
very young specimens of 7’. Grayi the deltidium plates meet 
in the middle, and the beak of this species being very 
short, the foramen soon erodes and enlarges, so much so 
that in adult specimens the deltidium plates are parted from 
each other to the distance of a quarter of an inch. The 
ribs of 7. Grayi are not really scaled, but scales are formed 
on them by the overlapping of the concentric lines of 
growth, and the colour is of deeper tone at these points. 
We are indebted to Mr. Davidson for distinguishing this 
species from the old Anomia rubra of Pallas, which belongs 
to the subgenus Avaussia. It is smaller, and has not a 
| looped apophysis. 
