OF CONCHOLOGY. 161 



NOTICES AND REVIEWS 



OF 



NEW CONOHOLOGICAL WORKS 



BY GEO. W. TRY0N, JR. 



I.— AMERICAN. 



The Canadian Journal of Industry, Science and Art. Conducted 

 by the Editing Committee of the Canadian Institute. New Series. Nos. 

 64 and 66. Toronto, Sept. and Dec., 1867. 



Molluscous Animals. Nos. 1 and 2. By Rev. Professor 

 Hincks. 



The author reviews the classification of the mollusca, in this 

 paper, by examining and amending the Polyzoa and Tunicata 

 proper, arranged as subclasses of Tunicata ; and the Conchifera. 

 It appears to us that he has accomplished but little for the bene- 

 fit of the science. His arrangement of Conchifera is as follows : 



" Order 1. Asiphonida. — Mantle lobes and branchial lamel- 

 lae unconnected or nearly so ; muscular impression generally* 

 single ; foot usually either obsolete or byssiferous. Families, 

 beginning with the lowest, — 



1. Ostrwidce ; 2. Mytilidoe ; 3. Aviculidce ; 4. Pectinidce ; 

 5. Arcadoe. [Pecten has a foot, also Nucula ; Area has 

 two muscular impressions, Dreissena three, Avicula two or 

 more. The mantle lobes in Modiolarca are connected.) 



Order 2. Nayades, — Mantle margins united between the ex- 

 current and incurrent orifices, and rarely in front of the 

 latter ; excurrent orifice plain, incurrent fringed ; foot very 

 large ; branchial lamellae united posteriorly to each other 

 and to the mantle ; sexes distinct ; inhabit fresh water or 

 estuaries ; shell generally nacreous within. Families, — 



1. Mutter idee ; 2. JEtlwiadoe ; 3. Anodontidce ; 4. Trigonia- 

 dw ; 5. UnionidoB. 



* The italics are our own. 



