214 
ZOOLOGICAL LITERATURE, 
As this interesting paper is within reaeh of most scientifie men_, 
and its contents do not admit of further condensation without 
losing their perspicuity, we may be allowed to remark here only 
that the author identifies the infundibulum of the Cephalopods 
with the foot of the Gastropods, the eight tentacles of the for- 
mer with the velum or formerly so-called proboscis of Conus and 
the labial palps of the bivalves, the two longer arms or tentacles, 
armed in Onychoteuthis Avith numerous hooks, Avith the check- 
hooks or evertile tubes of some Pteropods and the arroAV -bearing 
organ of Conus. 
Morcii, O. a. L. On the Operculum and its Mantle. Ibid, 
p. 117. 
The operculigerous lobe of the Gastropods is not homologous * 
with one of the halves of the shell and mantle in bivalves ; 
but a division of the mantle into two halves, both corresponding 
to the univalve spiral shell, is to be traced in some genera, as 
Emarginulaj Monoceros, Akera, Carinaria, and Onustus. The 
operculigerous lobe is not homologous with the byssus, as a byssus 
exists in some operculated univah^es beside this, for example 
in Cyclostoma suspe ns mn (Guilding) and Cerithidea obtusa (Sow.). 
Morse, Edw. S. A classification of Mollusca, based on the 
Principle of Cephalization. Proc. Essex Instit. Salem, 
Mass. iv. No. 6, 1865, July. 
The author proposes to name the mollusks Saccata (a term 
corresponding to those of Vertehrata, Articulata, and Radiata)^ 
the sac-feature, essential to all animals, being presented most 
completely by them. In the Polyzoa the mouth and anus are 
situated at the posterior pole of the sac, in the Brachiopoda the 
sac is permanently invaginated, in the Timicata the mouth 
placed at the bottom of the sac, whilst the situation of the anus 
varies; but in all these three classes { = Molluscoidea of Milne- 
EdAvards or Anthoid Mollusca of Dana) the sac is essentially 
closed at the anterior end, and consequently the mouth opens 
towards the posterior end, and, with few exceptions, all are 
attached by the anterior end or on the dorsal side. In the 
higher classes, on the contrary, the sac opens anteriorly, the 
mouth permanently occupying the anterior region, and the 
attachment, where existing, is ventral or posterior. The cephalic 
power manifests itself very feebly in the Lamcllibranchia, their 
mouth being partially inclined backAvards, receiving its food from 
that end without seizing or triturating it, and their foot beiug 
simply an organ of locomotion or even not capable of that. In 
the Gastropoda, the mouth has a biting and triturating apparatus, 
and the foot is more specialized, in some instances (Natica) even 
seizing and retaining the prey. In the Cephalopoda the cephalic 
poAver is manifested not only by locomotion and prehension, but 
