96 THE NAUTILUS. 
NOTICES OF NEW PUBLICATIONS. 
DESCRIPTION D’UNE NOUY. ESPECE DE Moprora (Feuille des 
Jeunes Naturalistes, May—June, 1895), M. gallica, Dautzenberg, from 
the ocean coast of France. 
On THE VALIDITY OF THE GENUS MARGARITANA. By Charles 
T. Simpson (Amer. Nat., April, 1895). The author maintains that 
Margaritana is not a natural genus, but is of polyphyletie origin, 
the species having arisen from various diverse groups of Uniones. 
Screntiric ResuLtts oF EXPLORATIONS BY THE U. S. Fisa 
Commisston STEAMER ALBATROSS. Report on Mollusca and Brach- 
iopoda dredged in deep water chiefly near the Hawatian Islands, with 
illustrations of hitherto unfigured species from Northwest America, 
By William Healey Dall. Eight hauls of the dredge were made 
by the Albatross in between 300 and 400 fms., on approaching Hon- 
olulu, securing a number of very interesting new forms of the genera 
Scaphander, Pleurotoma, Mangilia, Spergo (a new group) Polinices, 
Solariella, Emarginula, Dentalium, Euciroa, Lyonsiella and Pectun- 
culus. The anatomy of Euciroa, Halicardia and a new Lyonsiella 
is discussed by Dall at some length, and the important point that 
the foliobranch type of gill exists in certain members of groups in 
which most genera have the reticulate type, is brought forward and 
amply fortified by figures. Moreover, the branchial septum is shown 
to be of diverse origin in some allied genera, being made up in part 
of a reflected nephridial lamina in Halicardia and Lyonsiella. The 
facts developed tend strongly to break down the primary division 
of Lamellibranchiata based upon the modifications of the gill, as in 
the classification of Pelseneer. Huciroa is shown to be different 
from Verticordia, of which it had formerly been considered a sub- 
genus, and a new family, Euciroide, is furmed for it. In gill strue- 
ture it seems to be intermediate between the foliobranchiate and the 
reticulate types. “ The discovery of this type may be said to prac- 
tically complete the series uniting the foliobranch with the reticu- 
late gill, and give the quietus to the classification based solely on 
the divergencies of the ctenidia.” 
The examination of the soft parts of Mytilimeria fleruosa shows 
that form to constitute a new genus now described as Halicardia. 
The second part of the paper gives additional information on 
Northwest American species of Buceinum, Chrysodomus, Trophon, 
etc., described in Proc. U. S. Nat. Mus., 1891, with good figures 
of many interesting forms. A valuable essay on the north Pacific 
Brachiopods concludes the article. 
