2 Moll 
VII. MOLLUSCA. 
The writer desires in the first place to make a most earnest appeal to 
authors to send reprints or copies of their papers, indicating the original 
pagination, in order that they may be fully digested in the ‘ Record.’ 
Most important libraries receive a large proportion of their periodicals 
by exchange and frequently the senders do not distribute the works until 
several parts or volumes have accumulated, the result being that important 
papers are liable not to be recorded until a year or more after the proper 
date ; also far more time and care can be devoted to the work if it has 
not to be done under the pressure which prevails in most public libraries. 
Again, a large loss of time—and often expense—is caused by the search 
for privately issued papers and works of a similar nature. Whether 
the ‘ Record ’ be complete or incomplete, rests in a large measure with 
authors themselves, and to those who have already sent copies of their 
papers, grateful thanks are here tendered. 
As of old, Mr Pilsbry has made steady progress with Tryon’s (556) 
‘Manual,’ the Bulimulidce being completed, with a valuable index, the 
Cerionidaz dealt with, and the Urocoptidce commenced. Herr Simroth has 
continued Bronn’s (58) work, but the remarks as to its ‘ snail-like ’ rate 
of progress made in this preface some years ago, are equally applicable 
to-day. 
The ‘ Conchylien-Cabinet ’ of Martini & Chemnitz (337) has regularly 
appeared, the parts issued dealing with Bidiminidce , Leptopoma , Naninidce , 
Helix , Vermetidce , Ccecidce , Chitonidce , Pleurotomaria , Pyramidellidce , and 
Styliferidce : it is to be regretted that some of the plates, e.g. those of the 
Chitonidce , are by no means satisfactory. Under the name of Benard (38) 
will be found some useful plates showing sections of the shell ; while 
Kesteven (278, &c.) has given valuable information on the protoconchs of 
many Gastropods. Smith (490) has pointed out that the supposed specific 
identity of some Arctic and Antarctic Molluscs is by no means satis¬ 
factorily made out. To Johansen (257) we owe an interesting discussion 
of the supposed sinking of sea-beds. The origin of pearls has been dealt 
with by Jameson (246). 
Several papers relating to the Mollusca collected by various Expeditions 
may be grouped together. Nierstrasz (371) has dealt with the Aplacophora 
collected by the ‘ Siboga ’ Expedition ; Smith (496) has reviewed the 
Antarctic Collections of the ‘ Southern Cross’ ; Friele (180) and Knipo- 
vitsch (284) have added to our knowledge of the Arctic fauna ; Martens 
(336) has described a few shells from the German deep-sea Expedition ; 
Hedley (219) has chronicled the Pelecypods collected by the ‘Thetis’ oil’ 
the coasts of New South Wales ; while Bergh (40, 41) has dealt with the 
Opisthobranchs collected by the Danish Expedition in the Gulf of Siam, 
and continued his Philippine work in Semper’s ‘Reisen.’ 
The European Marine fauna has been the subject of much attention. 
Kobelt (286) has continued his valuable work; Bellini (37) has cata¬ 
logued the fauna of Capri ; Graeffe (201) that of Triest; Pallary (389) 
has added to our knowledge of the North African molluscs ; Granger 
(202) has dealt with the Mediterranean fauna of France, while a useful 
list of the Channel Islands shells has been written by Marquand (323). 
Ostroumov (382) has chronicled some shells from the Sea of Azov, while a 
list of the Aden fauna has been given by Shopland (481), and Eliot 
(160) has described some Nudibranchs from Zanzibar. Dall (113, &c.) 
has given several valuable papers on American molluscs, both of the East 
and West Coast. To Dautzenberg (128) we owe a study of the New 
Caledonian Cyprceidce. Those interested in the Australasian fauna will 
find much in the papers of Hedley (216, &c.), Kesteven (276, &c.), 
and Pritchard & Gatliff (431, 432) to repay attention. 
A very valuable and detailed account of the Russian slug-fauna has 
been written by Simroth (484). Pilsbry (403, &c.) has described a number 
