CONTENTS 



Page 



Introduction 1 



Methods 1 



Results 2 



Table 1 . --Summary of intertidal collections of 



horseshoe crabs in upper and lower parts of Plum 



Island Sound, Mass ., 1951 through 1954 2 



Table 2. --Summary of subtidal collections of 



horseshoe crabs in upper and lower parts of Plum 



Island Sound, Mass., 1951 through 1955 2 



Table 3. --The release of tagged horseshoe crabs 



from areas within Plum Island Sound,, Mass ., and 



their recovery during 1951 through 1955 3 



Table 4 . - -The release of tagged horseshoe crabs 



from areas outside Plum Island Sound, Mass., and 



their recovery 1952 through 1955 7 



Table 5. --Number of horseshoe crabs recovered by 

 three groups of searchers 1952 through 1955, listed 

 by areas and months g 



Table 6. --Number and percentage of tagged horseshoe 



crabs recovered 1952 through 1955 9 



Table 7 .--Mean carapace width of adult male and 



female horseshoe crabs collected in Plum Island Sound, 



Mass., 1952 through 1954 9 



Discussions 13 



Conclusions 13 



References I4 



Appendix A 15 



