quantities in Rehoboth and Indian River Bays. Coincident with hard clam in 

 smaller bays is Pitar morrhuana, which is commonly collected but less 

 abundant. Both species are on the borderline between true estuarine and 

 euryhaline marine species because they occur frequently near high salinity 

 inlets or in the ocean. The salinity range of M. meroenaria, according to 

 the literature, is 10-35°/°° • in the Delaware Bay area it was found between 

 15 and 30°/oo. It spawns May through October, is found in substrates of 

 silt-clay through medium sand with some shell, is an infaunal suspension 

 feeder, and a moderately rapid burrower. - J.L.M. 



1256 



Maurer, D. , L. Watling, P. Kinner, W. Leathern, and C. Wethe. 1978. 



Benthic invertebrate assemblages of Delaware Bay. Mar. Biol. 45(1): 65-78. 



Bay-wide surveys of benthic invertebrates were made in Delaware Bay in 

 summers, 1972 and 1973, at 105 and 102 stations respectively. Sediment 

 distributions were mapped. Predators of hard clam (Meroenaria mercenaries) 

 include blue crab and horseshoe crab. Unpublished laboratory studies showed 

 that blue crabs can destroy up to 2 5 juvenile hard clams/day each, and that 

 in tanks with several cm of sand casual movements of large horseshoe crabs 

 crushed large numbers of juvenile hard clams. M. meroenaria was not among 

 the 30 most frequently occurring species in samples. - J.L.M. 



1257 



Maury, C. J. 1920. 



Recent Mollusca of the Gulf of Mexico and Pleistocene and Pliocene species 

 from the Gulf States. Part I. Pelecypods. Bull. Am. Paleon. 8: 1-116, 1 pi. 



This paper was not seen. - J.L.M. 



1258 



Medcof, J. C. 1947. 



Clam farming in the Maritimes - preliminary information. Oyster Inst. N. 

 Am., Trade Rept. 84, 3 p. 



Could not locate. Search terminated. - J.L.M. 



1259 



Medcof, J. C. 1959. 



Stock-taking shows that seven species are marketed; prospects for improve- 

 ment. Dept. Fisheries of Canada, Trade News. 



Could not locate. Search terminated. - J.L.M. 



1260 



Medcof, J. C, and C. J. Kerswill. 1965. 



Effects of light on growth of oysters, mussels, and quahaugs. J. Fish. Res. 

 Bd. Canada 22(2): 281-288. 



Three species, Crassostrea virginioa, Mytilus edulis, and Meroenaria meroenaria, 

 were held in floating trays, in paired lots in light and dark compartments. 

 Linear shell growth of oysters and mussels was greater in the dark, but 

 thickness.: length ratio (cupping) was reduced. No differences between the 

 two lots of quahog were noted, except that meats were plumper (fatter) in 

 light-exposed compartments, as were those of the other two species. - J.L.M. 



352 



