1035 



Ladd, H. S. 1951. 



Brackish-water and marine assemblages of the Texas coast, with special 

 reference to mollusks. Univ. Tex., Inst. Mar. Sci., Pub. 2(1): 125-164. 



Shells of Venus mercenaria were found on Padre Island. - J.L.M. 



1036 



Laki, K. 1957. 



A simple method for the isolation and crystallization of tropomyosin from 

 the muscles of the clam, Venus mercenaria. Arch. Biochem. Biophys. 67(1) : 

 240-242. 



A method is described which yields tropomyosin of high purity from adductor 

 or foot muscles of hard clam. The extract was identified as tropomyosin 

 because in salt-free solution it was very viscous but viscosity was reduced 

 by addition of salts, it had sedimentation properties similar to other 

 tropomyosins, and it had a characteristic amino acid composition. Most 

 "contractile" proteins of Venus muscle have been named "paramyosin" because 

 X-ray and electron-microscopic properties are different from those of myosin. 

 A possible identity of V. mercenaria tropomyosin with "paramyosin" was under 

 investigation. - J.L.M. 



1037 



Lambert, L. 1949. 



Note complementaire sur le clam (Venus mercenaria) . Rev. Trav. Off. Peches 

 Marit. 15: 118-122. 



According to Heppell (1961), Lambert reported introductions at Concarneau, 

 St-Armel, Sarzeau,and elsewhere in France, none of which was successful. - 



J.L.M. 



103S 



Landers, W. S. 1950. 



Growth studies of Venus mercenaria - 1950. Ann. Conf . , Clam Investigations, 

 Boothbay Harbor, Me. U.S. Dept. Interior, Fish Wildl. Serv.: 29-30. 



Marked clams at Wickford, 2nd to 3rd year 18 mm, 3rd to 4th yr 12 mm, 4th to 

 5th yr 8 mm. Modal shifts of length- frequencies Cornelius Island, 1st to 

 2nd yr 19 mm, 2nd to 3rd yr 14 mm. Distribution of modes in length- 

 frequencies of Cornelius Island clams shows the yr-class has a peak at 

 6-7 ram, growth from to 1st yr is about 20 mm. Sizes at various ages of 

 Wickford (Cornelius Is) quahogs are: end of 1st summer 7 mm; 2nd summer 

 27 mm; 3rd 45 mm; 4th 57 mm; 5th 65 mm. Some Wickford clams will reach 

 marketable size (48 mm) at end of 3rd summer, but most not until during 

 4th summer. - J.L.M. 



1039 



Landers, Warren S. 1952. 



Growth of Venus in Wickford, Rhode Island. 3rd Ann. Conf. on Clam Research, 

 Boothbay, Harbor, Me. U.S. Dept. Interior, Fish Wildl. Serv.: 88. 



Clams grew as follows: Original Mean lengths 



length end of 1st yr end of 2nd yr 

 28-29 44-46 51-56 



45 56-57 62-63 



56-58 64-65 68-71 



Some became legal length in 3rd summer, but most not until the 4th summer. 

 - J.L.M. 



291 



