9& MR. O. A. L, MORCH ON THE VERMETID&. ([Jan, 24, 
smooth shell, with longitudinal reddish bands, exactly answering to 
Aletes centiquadrus (Val., Carp.). 
M. Lacaze-Duthiers* has discovered that the female Vermetus 
deposits the egg-bags (which are very like those of Hipponyx and 
Calyptrea) in the last whorl, towards the aperture, where the eggs 
are hatched. It seems to me probable that the large aperture of the 
last whorl stands in connexion with this habit, as it otherwise would 
not be easily understood how the animal would be able to protrude 
the head in search of food. Still it must be remembered that some 
Vermeti, in a young state, close the aperture up with a convex 
septum, provided with a central slitt. This septum is, perhaps, 
analogous to the hybernaculum of the Helices, and indicates only - 
some periodical rest in the growth. 
I have never intended to introduce a tri- or poly-nomial nomen- 
clature; but I believe it is necessary to name the different varieties, 
forms, and deviations, as well as the differences of sex and age. 
My nomenclature for the varieties, therefore, cannot properly be 
compared either with Klein’s or Middendorf’s generic nomenclature. 
** Falco islandicus, var. grenlandicus, young male in winter dress,” 
is certainly, for instance, a very long name; but I cannot see any 
superfluous words. I have never named a variety with eight words, 
as Mr. Carpenter (who seems to have overlooked that he has con- 
founded the appellations of two distinct varieties from two different 
localities) indicates (7. ce. p. 558). 
Additions and Corrections. 
SILIQUARIA FLORINA (Defr., Chenu) is, according to M. Des- 
hayes, a Vermetus, in the aperture of which a fragment of Tenagodus 
is inserted. For the variety figured by Dr. Chenu, M. Deshayes 
proposes (Animaux sans Vertébres du Bassin de Paris, ii. p. 246) 
the name Siliquaria millepeda, which is synonymous with Serpula 
cochlearia (Detr., Sow. Gen., where it is stated to be from the “ cal- 
caire grossiére at Orglandes’’). 
TENAGODUS AUSTRALIS (6) is a distinct species, which I have 
named 7’. reentzii. 
TENAGODUS (PyxIPOMA) MOBII, 0. sp. 
T. volubilis, laxa, solidissima, crassa, levigata, nitidula, sordide 
alba, infime flavescens ; rima in anfr. tribus primis (qui adsunt) 
clausa, in anfr. sequente foraminibus duobus oblongis geminis 
remotis, deinde aperta marginibus irregularibus; aperturam 
versus hians, marginibus acutis simplicibus. Apex tubi septo 
hemispherico clausus. 
Diam. aperturee circ. 7 m. 
* Annales des Sciences Naturelles, sér. 4, vol. xiii. p- 248. It is also stated 
that the female of Bivonia semisurrecta has the mantle deeply fissured; but, un- 
fortunately, it was not seen before the shell was lost. 
T Gray, Annals of N. H. 1851, viii. p. 479, t.17 B. f. 4-6; and Sowerby, Ge- 
nera, Serpula, f. 5. 
