LAMELLIBRANCHIATA. 
166 
Subclass MONOMYARIA. 
Tribe. With a foot. Families : Mulleriadse, Malleidse, Pectinidse, 
Anomiadse. 
Tribe. Apodoiis, Family Ostreidse. 
The terms Disiphonophoray Monosiphonophoray and Asipho- 
nophora respectively relate to the double or single separate 
openings or the entire cleavage of the mantle, characters used 
as a base of systematic arrangement in this class already by 
Cuvier, in his * Regne Animal,^ 1817, and having no reference 
to the external union (as in My a), or the distinct nature (as in 
Tellina), of both siphons. The terms Scoliephora and Ascolie- 
phora answer to the Siniipalliata and Integripalliata of English 
conchologists. The distinction of Crateromonaria and Cratero- 
dimaria is new : in the first, the siphons are inserted at the end 
of the retractor muscles, so as to form a simple prolongation of 
the mantle ; in the latter, they are inserted in a septum formed 
by those muscles, and projecting into the pallial cavity, which is 
thereby divided into two cells. The author disapproves of the 
distinction of the Mytilidce as a separate subclass, a method 
indicated by Adanson and adopted by Morch. 
[This classification seems more artificial than natural. As regards the 
mere names of the families, it is inconsistent to write Anomiadse, Myadie, 
Arcadee, Carditadse, and also Ostreidse, Chamedse, &c. ; and the Recorder 
believes the latter method to be the better. The construction, moreover, of 
PanopjVlas and Psammobidse is wrong, and should bo Panopsetdae and Psam- 
mobndae ; Tapesidae also, should be Tapeddae.] 
Stoliczka^s beautiful work (Palaeontologia Indica, iii. 1870) 
on the fossil Bivalves of the cretaceous strata of India, contain- 
ing a systematic arrangement of all known genera of Bivalves, 
with their characters, has a direct importance for the student of 
recent shells ; in it all species hitherto described from the creta- 
ceous strata of all parts of the world are enumerated, those, 
from India being fully described. 
INCLUSA. 
PnOLADIDiE. 
Xylophaga dorsalis found in floating oak-wood: the living animal ver- 
bosely described by Verkriizen, Nadir, malak. Ges. iii. pp. 139-142. 
Teredo. Some interesting particulars concerning spp. found on the Danish 
coasts (among them Xylotrya stutchburyi, Leach, in the wood of ships 
returning from India, described by Spengler as Teredo navalis') are given by 
Morch, Vid. Medd. 1871, p. 202. 
Teredo navalis (L.) and hipennata (Turton) [the last probably 
(Blainv.)] observed on S.W. coast of France, and their pallets described. Two 
different spp. may dwell in the same piece of wood. Fischer, Act. Soc. L. 
Bord. xxvii. pp. 83 & 84. 
