1523 



Ramus, J. 1971. 



Codium: the invader. Discovery 6(2): 



Could not locate. Search terminated. 



1524 



Rapport, Maurice M. 1968. 



Discussion of the possible mechanism of action of serotinin on molluscan 

 muscle. Adv. Pharmacol. 6, B: 16-17. 



The paper relates to Dr. Twarog ' s work on intracellular Ca levels as the most 

 probable site for explaining how 5-HT (5-hydroxytryptamine) causes relaxation 

 of catch in retractor muscle of Mytilus. The author refers to work by Woollev 

 and Gommi (1965, 1966) cited elsewhere in this bibliography, and speculates on 

 participation of lipids other than gangliosides as 5-HT receptors. - J.L.M. 



1525 



Raven, C. P. 196 4. 



Development. Chapter 5 in Physiology of Mollusca. Vol. 1. K. M. Wilbur and 

 C. M. Yonge (edsj . Academic Press, New York: 165-195. 



In all molluscs, except cephalopods, cleavage is spiral. - J.L.M. 



1526 



Ravera, 0. 1968. 



Molluscs in radiobiology . In Proc. Symp. Mollusca, Pt. II. Mar. Biol. 

 Assn. India, Mandapam Camp: 456-462. 



This review paper mentions work of others, abstracted elsewhere in this 

 bibliography, on influence of dose on reduction of survival time. Mollusks 

 are much more radioresistant than mammals. - J.L.M. 



1527 



Raymont, J. E. G. 1972. 



Some aspects of pollution in Southampton Water. Proc. Royal Soc. London 

 B180(1061): 451-468. 



Meraenaria meraenaria from 4 parts of Southampton water had residues of 0.18 

 to 0.57 yg/g dry tissue Hg, 3.2 to 7.12 ug/g As, and 0.007 to 0.015 pg/g Sb. 

 Gills had highest Hg concentration. Concentrations of Zn, Cu,and Fe are given 

 from a paper by Romeril (1971) abstracted elsewhere in this bibliography. It 

 was concluded that, although M. meraenaria can concentrate some heavy metals 

 to an extraordinary degree, Southampton Water could not be regarded as a 

 dangerously polluted area. Thermal effects from a power plant have apparently 

 favored spawning of hard clam in a limited area. To the west, beyond the 

 effects of waste heat, no records of Meraenaria existed. In the general area 

 100 clams of all sizes have been recorded per yd2. In the outfall the highest 

 density of commercial sizes was 160/m2. Highest density of young clams (10 mm 

 mean) was 4,750/m2. The author notes that Carriker (1961), abstracted 

 elsewhere in this bibliography, gave 3 clams/yd2 as a reasonable commercial 

 density, and regarded "several per sq. ft." as "dense". Bottom mud, which is 

 rich in total Hg, may be a major source of Hg for clams. Spawning of 

 Meraenaria meraenaria in the area appeared to occur at temps 18 to 19°C and 

 above. - J.L.M. 



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