BIOLOGICAL SURVEY OF WOODS HOLE AND VICINITY. 



725 



Polynices duplicate, Continued. 



heros], except on the outer beaches," certainly 

 does not apply at present to the greater part of 

 Vineyard Sound. It is perhaps true, however, 

 of the shallower waters skirting shore. Of eight 

 living specimens of this genus collected at 

 scattered points in the immediate vicinity of 

 Woods Hole by Mr. Pope and assistants during 

 June and July, 1911, all proved to be P. 

 duplicata. 



Fish Hawk stations: 7522 (i very small shell), 

 7541 bis (i shell), 7542 (2 shells),. 7543 (i liv- 

 ing). 7554 (few shells), 7559 (few shells), 7561 

 (i), 7563 (i shell), 7576 (i shell), 7577 (? i), 

 7585 (i shell), 7588 (i shell), 7602 (2 shells), 

 7613 (i shell), 7615 (several shells and living), 

 7617 (2), 7620 (i shell), 7622 (few shells), 7626 

 (i), 7627 (few), 7630 (few shells), 7632 (several), 

 7634 (i shell), 7637 (i shell), 7638 (few shells 

 and i living), 7639 (i shell), 7644 (fragments), 

 7648 (i shell), 7653 (2), 7654 (i shell), 7657 (i 

 shell), 7659 (i shell), 7661 (several shells) , 7675 

 (i fragment), 7719 (i shell), 7740 (several 

 shells), 7753 (i shell), 7762 (several shells), 

 7766 (few shells), 7767 (several shells), 7769 

 (several shells), 7770 (i shell), 7773 (i shell), 

 7778 (several large shells), 7781 (i small shell), 

 7783(1 shell). 



Phalarope stations: 19 (4), 28 (i), 52 (few, i liv- 

 ing). 53 (i shell), 59 (i), 60 (i small shell), 63 

 (i), 66, 71 (i shell), 73 (i shell), 76 (i shell), 79 

 (i shell), 81, 82 (i shell), 84 (i shell), 89, 90, 91, 

 95, 96, 97, 100 (shell), 101, 103, 109 (i shell), 

 113, 116, 118 (i young shell), 122 (few shells), 

 129 (i living), 130 (few small shells), 131 (i liv- 

 ing), 132, 135 (2 small), 138 (i), 140 (2 small), 

 143 (i shell), 144 (i living), 146 (i living), 148 

 (i), 149 (i), 151 (i small), 154 (i living), 155 

 (fragments), 160 (i shell), 165 (i shell), 166 (i 

 shell). 



The egg cases of this species constitute "sand 

 collars" similar to those of P. heros. Mr. 

 T. E. B. Pope finds some evidence that more 

 than one collar may be formed in a season. 

 Eggs which were deposited in the laboratory 

 were observed to hatch in a period of about 

 two weeks. 

 Polynices heros (Say). [Chart 187.] 



Gould, 1870, p. 338 (Lunatia heros); Verrill and 

 Smith, 1873, p. 646, 353, etc. (Lunatia heros); 

 Dall, 1889, p. 154 (Lunatia heros). 



Abundant and of general distribution through- 

 out Vineyard Sound; far less frequent in Buz- 



Polynices heros Continued. 



zards Bay, though not uncommon at the in- 

 shore stations; living specimens not infre- 

 quently dredged in 3 to 17 fathoms, predomi- 

 nantly on bottoms free from mud; shells of 

 much more general occurrence, these being 

 very frequently inhabited by hermit crabs 

 (Pagurus pollicaris and P. acadianus). Sur- 

 vey. This mollusk is common likewise in the 

 shallow waters along shore, and its shells are 

 familiar objects upon the beaches everywhere. 

 Fish Hawk stations : a 7521 (2 shells), 7521 bis (i 

 shell), 7524 (about 10 shells), 7525 (few) , 7530 

 (2 shells), 7530 bis (i), 7531 (i shell) , 7533 (frag- 

 ment) ,7534 (several shells) , 7535 (fewshells) , 



7536 (2 small shells), 7536 bis (several living), 



7537 (several shells), 7537 bis (i shell), 7538 

 (several shells) , 7539 (fragment) , 7541 (several 

 shells) , 7542 (many shells) , 7543 (manyshells), 

 7543 bis (several), 7544 (many shells), 7546 bis 

 (several shells), 7547 bis (several shells), 7549 

 bis (several shells), 7550 (i living, and shells) , 

 7551 (few shells), 7552 (few shells) , 7553 (i 

 small shell) , 7554 (several large and many 

 small), 7554 bis, 7556 (few shells) , 7557 (few 

 large and small), 7558 (manyshells) , 7559 (sev- 

 eral shells), 7560 (several shells) , 7561 (many) , 

 7562 (several shells) , 7563 (many shells) , 7564 

 (i), 756 4 bis( 2 shells), 7565 (few) , 7566 (r shell) 

 7567 (2), 7568 (several), 7569 (few small shells) , 

 7570 (2 shells) , 7572 (few shells) , 7574 (few 

 shells), 7578(3 living, several shells) , 7579 (few 

 shells) , 7 580 (several shells) , 7581 (i shell), 7582 

 (i), 7583 (i small shell) , 7584 (fewshells), 7590 

 (2 shells) , 7591 (i living, i shell) , 7592 (many 

 shells) , 7593 (i young) , 7594 (several shells) , 

 7595 (living and shells) , 7598 (few small shells 

 and i living) , 7599 (many large living), 7601 (i 

 small shell) , 7602 (manyshells) , 7607 (2 living, 

 2 shells) , 7633 (?), 7634 (?). 7637 (i shell), 7638 

 (i), 7645 (i shell ?), 7650 (? i living), 7664 (i), 

 7667 (i living), 7675 (i shell), 7676 (i), 7678 

 (many shells, mostly large, and i living), 7679 

 (living and large shells), 7680 (many large 

 shells), 7681 (manyshells), 7682 (several shells), 

 7683 (i fragment), 7692 (i fragment), 7698 (i 

 living and few shells), 7699 (several shells), 

 7700 (i living, several shells), 7701 (r living, 

 several shells), 7702 (many large shells), 7703 

 (manyshells), 7704 (i living), 7706 (several liv- 

 ing and shells), 7707 (many shells), 7708 (many 

 shells), 7709 (many shells), 7710 (i shell), 7717 

 (2), 7718 (several shells), 7719 (many shells), 



a During the summer of 1903 (Fish Hawk stations 7521 to 7607) the distinction was not always made in the field records between 

 small shells of Polynices heros and those of P. triseriata. It is likely, therefore, that certain of the foregoing records refer in part 

 to the latter species. The symbol denotes those cases in which such ambiguity is believed to be possible. 



