560 



Evans, John W. 1975. 



Growth and micromorphology of two bivalves exhibiting non-daily growth 

 lines. In Growth Rhythms and the History of the Earth's Rotation. G. D. 

 Rosenberg and S. K. Runcorn (eds.) . John Wiley & Sons, London, p. 119-124. 



The author comments that Pannella and MacClintock ' s (1968) experimental 

 study of growth lines in Mereenaria mereenaria seemed to establish without 

 doubt that micro-growth lines were of solar daily duration, yet Pannella 

 (1972) claimed that they were of lunar daily duration, even though his 

 original counts do not bear out this contention. Counting growth lines 

 is not easy and it is constantly necessary to make subjective decisions 

 about whether a line is really a line, or where an annual or monthly 

 series begins or ends. Thus, it is not surprising that counts often come 

 out close to hypothetical values. - J.L.M. 



561 



Eversole, Arnold G. 1978. 



Marking clams with rubidium. Proc . Natl. Shellf . Assn. 68: 78 (abstract) . 



Mereenaria mereenaria were successfully marked with rubidium by rearing seed 

 clams in artificial seawater with an aqueous solution of rubidium chloride. 

 Clams exposed for 48 and 96 hrs to 10.0, 1.0, 0.1, and 0.01 g/1 RbCl had 

 levels of Rb significantly higher than endogenous levels. Biological activity 

 was not affected by presence of RbCl at concentrations less than 10.0 g/1. 

 Significantly higher levels of Rb were present in tissue for up to 3 wks when 

 clams were exposed to 1.0 g/1 RbCl for 96 hrs, then transferred to uncontam- 

 inated water. Clams cultured for 9 6 hrs in vessels containing diatoms 

 (Phaeodaetylum trieornutum) exposed to 1.0 g/1 RbCl had significantly more 

 Rb than clams grown with unlabelled diatoms. Clams exposed to 1.0 g/1 RbCl 

 solutions with and without diatoms contained levels of Rb significantly 

 higher than clams reared only with labelled diatoms. - J.L.M. 



562 



Eversole, Arnold G., Peter J. Eldridge, and William K. Michener . 1980. 



Reproductive response to increased density: Some observations from molluscs. 

 Natl. Shellf. Assn., Abstracts, Technical Sessions: 1 (abstract). 



The amount of gonadal tissue in Mereenaria mereenaria grown at three popula- 

 tion densities was compared. Clams at the lowest density were larger, 

 weighed more, and had more gonadal tissue than clams from higher densities. 

 Gonadal-somatic indices indicated that the density-dependent reduction of 

 growth did not fully account for the reductions in amount of gonadal tissue. 

 - J.L.M. 



563 



Farley, C. Austin. 1978. 



Viruses and viruslike lesions in marine mollusks. Mar. Fish. Rev. 40(10): 

 18-20. 



This report summarizes the known characteristics of molluscan viruses and 

 attempts to categorize them into appropriate families. Pedoviridae : 

 chlamydial parasite of Mereenaria mereenaria; nucleic acid - unknown, pre- 

 sumptively 2 DNA linear; symmetry - octahedral on the basis of 2- 3- 4-sided 

 rotational planes in paracrystalline array; size- 50 nm, noneveloped virion; 

 morphology and development - short tails visible in 4-sided plane" of array 

 at 45° angle from the square. Herpetoviridae : other possible herpes infec- 

 tions in mollusks based on similarity of intranuclear inclusions have been 

 seen in Mereenaria mereenaria. Recent observations of gonadal "tumors" 

 in hard clams indicate the presence of herpes-type intranuclear inclusions 

 in affected cells. - J.L.M. 



158 



