170 CRETACEOUS GASTROPODA 
there are several species of Zerebra, which greatly resemble some species of the 
Buccinip#, but the largest number is decidedly more allied to the Prrammpri1D# 
or even to the mzrzivz of the Vozurrps. 
Quoy and Gaimard, when they made known the animal of Terebra, stated— 
perhaps guided by Lamarck’s suggestion—that this genus has to be classed close to 
Buccinum. (Vide Voy. d. Astrolabe, Zoologie, Vol. II, p. 461, Atlas, Pl. XXXVI). 
Further on the authors note the great relations of the animal of Terebra and Mitra, 
and state even that, in case any operculated Mitre are found, the passage between 
both would be so great, as to make a distinction almost impossible. The animals of 
the Tereprrp# are no doubt’ more like those of the wzrriv# than those of the 
Buccixipz. It appears to me, when comparing the animals of Zerebra with those 
of Nassa, Phos, Bullia, and others, that they have nothing more in common with 
each other than the elongated siphon; the examination of the teeth showed 
equally a great difference between both families. On what ground, therefore, the 
TrrepriD# ought to be classed with the Buccrvipz I am at a loss to perceive. 
We do not wish in the least to enforce the idea, that the Tzrrprmpsx are cor- 
rectly classed next to the PrramuzmpEezzipz, but we confess that upon looking over the 
extensive number of fossil species of the latter family, we are at the present unable 
to assign for them a better place. 
The Terebre live generally near the low water-mark, and are to be found in 
greatest variety in the eastern tropical and sub-tropical seas. Reeve described, 1860; 
in his last Monograph of Terebra 155 species, after rejecting some of the new species 
of Hinds and Deshayes, published in previous Monographs of the same genus. Since 
1860 a few new species have been described in the Journal de Conchyliologie; Proc. 
Zool. Soc.; and elsewhere, so as to bring up the number of living Terebra to about 
170 species. 
There are from the tertiary deposits about 30 specis of Terebra (Acus) quoted, 
some of which occur also living. A large number comparatively is known from 
America. Already in the eocene beds Terebra becomes very scarce, and, as regards 
the cretaceous, Prof. Pictet properly remarks that no species of Terebra are there 
known with certainty. (Vide Mat. Pal. Suisse, ser. III, p. 677.) 
The Terebra coronata, Sow., from the Alpine Gosau-deposits—Cerithium pseudocoronatum, D’Orb., 
is probably a Zympanotonos, in which case the change in the specific name would not be required. 
The Zeredra minuta, Galeotti, from Mexico is called by D’Orbigny Cerith. sub-minutum. 
Lerebra obconica, Sharpe, from Portugal has the form of Zerebra, but the specimens upon 
which it was founded appear fragmentary on the aperture and with the surface worn off, 
although the description does not refer to either. The columella is not twisted. 
The name Zerebra cingulata, in Giebel’s Petref Deutsch., p. 481, refers to Fusus cingulatus, 
Sow., from the Gosau (Zekeli’s Gastropoden der Gosaugebilde, p. 91, Pl. XVI, Fig. 7, in Abhand- 
lung. der Geol. Reichs-Anst. 1852, Vol. I). Dr. Zekeli considered the species first as a Zeredra, 
but retained afterwards Sowerby’s determination. I have in my revision (Sitzb. Akad. Wien, 1865, 
vol. LIT, p. 83) remarked, that the species may not unlikely be proved to bea Zeredra, although” 
it has not a tortuous columella, but a distinct sutural band. No perfect specimens have been as 
