Moll 1 
VII. MOLLUSCA. 
BY 
E. R. Sykes, B.A. 
Assisted by E. A. Smith and S. Pace. 
CONTENTS. 
Introduction. 
I. Titles. 
II. Biology. 
Anatomy, Physiology, &c. 
Distribution. 
Geographical. 
Non-Marine. . . . 
Marine. 
Geological . . 
III. Systematic. 
Cephalopoda . . 
Dibranchiata . 
Ammonea . . 
Tetrabranchiata 
Gastropoda . . 
Pulmonata . . 
Stylommatophora 
Basommatophora 
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40 
45 
52 
56 
68 
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69 
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80 
Opisthobramchiata . 
Nudibranchiata . 
Tectibranchiata . 
Nucleobranchiata 
Prosobranchiata . . 
Pectinibranchiata. 
Scutibranchiata . 
Scaphopoda .... 
Pelecypoda. 
Septibranchiata . . 
Eulamellibranchiata 
Pseudolamellibranchiata 
Filibranchiata. . . 
Protobranchiata . . 
Amphineura . . 
Aplacophora . 
Polyplacophora 
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101 
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102 
INTRODUCTION. 
Although the number of papers dealing with the Mollusca has, during 
the year 1901, shewn a slight increase, the flood of new generic and 
sectional names has—temporarily only though it may be—slightly abated. 
In the first place we have to note the steady progress of Tryon’s (607) 
‘Manual,’ Pilsbry having continued his study of the Bulimulidce. Of the 
‘ Conchylien-Cabinet ’ of Martini & Chemnitz (348), ten parts have 
appeared, dealing with the Zonitidce , Bulimznidce, Auriculacea , Pyrami- 
dellidce, Pleurotomaria and Vermetidce. After a year’s interval we have 
to chronicle a further instalment by Simroth of the Molluscan portion of 
