OF CONCHOLOUY. 



237 



NOTICES AND REVIEWS 



OK 



NEW CONCHOLOGIOAL WORKS. 



BY GEO. W. TRYON, JR. 



L— AMERICAN. 



American Naturalist. V., Nos. 8 and 9., Sept., 1871. 



On the Relations of Anomia. By Prof. E. S. Morse. 



"In examining some sea-weed collected by a friend last 

 spring, I found a lot of the young of Anomia. In these the 

 sinus was not closed, but open towards the anterior margin. 

 The nucleus presented an elongate oval shell larger behind ; the 

 beaks nearer the anterior, and no sign of a perforation. The 

 shape was more like that of Montacuta, and the lines of growth 

 were regular and distinct. On the right valve, at its lower mar- 

 gin, was seen a slight notch, and the few last incremental lines 

 indicated that the notch was made in the last stages of the nu- 

 cleus. It can only be conceived that the animal before this was 

 a rover, that it then commenced to fix a byssus, the animal 

 dropping to one side and the notch caused by the lowermost 

 valve growing around it, the other valve showing no signs of this 

 notch. So soon, however, as the shell rested upon one side a 

 different growth took place ; a loose textured, colorless deposit 

 rapidly formed, the outline becoming gradually circular, and the 

 lowermost or right valve growing rapidly behind and downward, 

 then forward and upward, the byssal attachment soon became 

 enclosed in a wide foramen, this extension ultimately reaching 

 the umbones of the larvel shell to which it unites." 



American Naturalist. V., No. ]l,Nov., 1871. 



Land Shells of Western Massachusetts. By W. G-. 

 Freedlby. 



Qonehological Notes. By G. S. Stearns. 



