LINGULA. 
Prate I. 
Genus LINGULA, Lamarck. 
Testa subequivalvis, tenuis, cornea, interdum subcalcarea, 
plerumque cerulescente-viridis, postice plus minus at- 
tenuata, umbonibus parvis, subrostratis, pediculo ten- 
dineo affica. Cardo nullus. 
Shell nearly equivalve, thin, horny, sometimes a little cal- 
careous, cenerally blue-green, more or less attenuated, 
with the umboes small and rather beaked, affixed to 
a tendinous pedicle. No hinge. 
The Duck’s Bill shell is rather an anomaly in the series ; 
and as specimens and odd valves of it came to be disco- 
vered, there was much curious speculation among natural- 
ists as to its affinities. Seba took it to be a pedunculated 
Barnacle; Petiver named it the Duck’s Bill, without refe- 
rence to its natural place in the system; Linnzeus, who 
either regarded the valves as separate shells, or knew only 
of one valve, described it as a Patella ; Chemnitz called it 
a Pinna, and Dillwyn a Mytilus. Further researches are 
necessary to show whether the length of the pedicle can 
be regarded as a specific character. It varies materially 
in the species, but the collectings of individuals have 
been confined to too few localities. It is more than pro- 
bable that the pedicle may vary with the nature of the 
soil, depth, ete. The valves, as seen in collections, vary 
a little in form, according to the manner in which they 
have been dried. 
Though not common, the Zizyula abounds in its par- 
ticular haunts below low-water. Mr. Cuming once saw 
as many as twenty bushels of Z. anatina washed ashore in 
the Bay of Manila, after a stormy typhoon. Another fa- 
voured locality appears to be about Moreton Bay, Austra- 
lia. Three species are from the Sandwich Islands, Cali- 
fornia, and the West Indies. 
Species 1. (Fig. a, 6, Mus. Cuming.) 
Lineuta ovatis. Ling. testd oblongo-ovali, subangusta, 
glabra, nitente, ceruleo-viridi, interdum olivaceo tinc- 
td, apice acuminato ; valvis utrinque clausis. 
Tue ovaL Linevra. Shell oblong-oval, rather narrow, 
smooth, shining, blue-green, sometimes tinged with 
olive; apex acuminated ; valves closed on each side. 
Retve, Pro. Zool. Soc. 1841, p. 100. 
Hab. Sandwich Islands; Pease. 
Eighteen years ago, when I described this species in the 
Proceedings of the Zoological Society, Mr. Cuming knew 
nothing of its habitat. He has lately received specimens 
from W. H. Pease, Esq., a gentleman much attached to 
Natural History, and a most assiduous collector of shells, 
residing at Honolulu, one of the Sandwich Islands. In- 
dependently of its oval form, the shell is distinguished from 
the rest of the Lingule by the brilliancy of its verdigris 
blue-green colour. 
Species 2. (Fig. a, 6, Mus. Cuming.) 
Lineuna tumipua. Ling. testa corned, tenuissimd, fusco- 
vel rubro-olivaced, subquadratd, versus apicem parum 
attenuata ; umbonibus indistinctis ; valvis utrinque 
clausis. 
THE SWOLLEN LineuLa. Shell horny, very thin, brown- 
ish- or reddish-olive, somewhat square, but little at- 
tenuated towards the apex; umboes indistinct ; valves 
closed on each side. 
Reeve, Pro. Zool. Soc. 1841, p. 100. 
i. p. 180. pl. 125. f. 4. 
Eadem var. Lingula compressa, Reeve. 
Hab. Island of Masbate, Philippines ; Cuming. 
Bay, Australia; Strange. 
Conch. Syst. vol. 
Moreton 
The specimen figured of this fine species was collected 
at Moreton Bay, Australia, by Mr. Strange. The variety 
compressa, which I regarded originally as a distinct species, 
was collected by Mr. Cuming in sandy mud at low-water, 
at Palanas, Isle of Masbate, one of the Philippines. The 
distinctions then noted appear to have resulted from a 
difference in the mode of drying. 
Species 3. (Mus. Cuming.) 
Lincuta Murrarana. Ling. testa oblongo-ovatd, an- 
tice quadratd, posticé attenuatd, umbonibus parvis, 
acutis, luteo-virescente, cupreo-rufescente tincta ; val- 
vis undique clausis. 
Murruy’s Lincuta. Shell oblong-ovate, anteriorly 
square, posteriorly antenuated, umboes small, sharp, 
yellowish-green, stained with coppery-red; valves 
closed throughout. 
Kine, MS. Mus. Cuming. 
Hab. Moreton Bay, Australia; Strange. 
Whether this should be regarded as an Australian form 
of L. anatina or as a distinct species, it is certain that the 
November, 1859. 
