Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 ANODONTA.—UIVIO. 23. We dfstinguish those Mussels which have the hinge placed lower, under the name of Modiolus, and another is called LiTHODOMUs, which has the shell almost equally rounded at both ends, and excavates holes in stones, to which it was at first only suspended. Fig. 100. ANODONTA. 24. The Anodo^t^ live in fresh waters, and are recog- nised by their thin shell, moderately inflated, oval, close, and without teeth in the hinge (Jig. 100); they
Elements of conchology Prepared Elements of conchology / Prepared for the use of schools and colleges elementsofconcho00rusc Year: 1844 ANODONTA.—UIVIO. 23. We dfstinguish those Mussels which have the hinge placed lower, under the name of Modiolus, and another is called LiTHODOMUs, which has the shell almost equally rounded at both ends, and excavates holes in stones, to which it was at first only suspended. Fig. 100. ANODONTA. 24. The Anodo^t^ live in fresh waters, and are recog- nised by their thin shell, moderately inflated, oval, close, and without teeth in the hinge (Jig. 100); they want the byssus, and are provided with a very large foot, compressed and almost quadrangular in form, by means of which they crawl on the sand or mud. A great many species are found in the great rivers of the United States. 25. The U^:ioNES closely resemble the Anodonta?, but have a more complicated hinge, the right valve having a pit (fossette) into which a tooth of the left valve penetrates, presenting behind a long lamina, which, in its turn, is received between two laminse of the opposite side. These mollusks also inhabit fresh waters, but prefer those which are running. A very great num- ber of species are found in our Western waters, for the descrip- tion of most of which we are indebted to the labours of Mr. I. Lea, of Philadelphia. 23. What is the genus Litho'domus ? (From the Greek, lithos, a stone, and the Latin, domus, a house.) 24. How is the genus Anodo'nta recognised? (Anodonta, frpm the Greek, a, witliout, and odous, in the genitive case, odontos, a tooth.) 25. What are the characters of the genus U'nio ? (Unio, Latin, a pearl.)
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