BIOLOGICAL SURVEY OF WOODS HOLE AND VICINITY. 



723 



Crepidula convexa Continued, 



of the genus which are present locally, the 

 former being almost exclusively a littoral or ad- 

 littoral form. It is commonly found upon the 

 shells of Littorina litorca and Ilyanassa obsoleta, 

 when occupied by Pagurus longicarpus; occa- 

 sionally upon the shells of the living mollusks, 

 or even upon eelgrass. 



Fish Hawk stations: 7524 bis (? i living), 7525 

 bis (? i living), 7532 (i), 7546 bis (? living), 

 7547 bis (? living), 7552 bis (i shell), 7560 (i), 

 7584 (2, i living), 7621 (? few shells), 7630 (i 

 living), 7632 (i living), 7654 (i shell), 7668 (i 

 living), 7672 (3 living), 7725 (2 living), 7782 

 (i shell and i living). 



Phalarope and Blue Wing stations: 6 (i living), 

 9 (i), 17 (i living), 19 (common on Tritia and 

 Littorina), 20 (i living on Tritia), 34 (i frag- 

 ment), 50 ( i on Littorina), 52 (several living), 

 53 (i), 62 (several living), 68 (2 living on Tritia) 

 71 (i living), 72 (i with eggs), 78 (i on Anachis 

 shell), 79 (on Littorina), So (many shells), 81 

 (i), 82 (i living), 83 (i living), 93 (i living), 

 94, 95, 98, 104, 107 (i shell), 109, 122 (i living), 

 126 (i living), 130 (i shell), 134, 136, 138, 140 

 (few shells), 145 (few living), 147 (2 living), 

 150 (i shell), 152 (i living), 154 (several shells), 

 157, 158 (2), 163 (i small living), 164 (several 

 living), 165 (several living and shells), 166 (i 

 shell), 167 (i living). 



Breeds from July i to September i ; males smaller 

 than females and motile. Conklin. "A de- 

 pressed variety (glauca) is found, chiefly on 

 broad and nearly flat surfaces." Verrill. 

 Crepidula plana Say. [Chart 185.] 



Gould, 1870, p. 272; Verrill and Smith, 1873, p. 

 6so, 355, etc. (Crepidula plana and Crepidula 

 unguiformis); Ball, 1889, p. 152; Conklin, 

 1897, p. 12; Thompson, 1899, p. 582. 



Abundant and of general distribution throughout 

 the shallower and deeper waters of the region. 

 Distribution coextensive with that of the hosts. 

 Most frequently found inside shells occupied 

 by hermit crabs; small specimens (perhaps a 

 "dwarf variety" Conklin) being associated 

 with Pagurus longicarpus, larger ones with 

 P. pollicaris and P. acadianus; also occurring 

 on the outside of oysters, on Limulus and in 

 other places. Dredged by the Survey in 2 to 

 25 fathoms, on every variety of bottom. 



Fish Hawk stations: 7521 (few shells), 7521 bis 

 (few shells), 7523 (few shells), 7523 bis, 7524 

 (few shells), 7525 (few shells), 7525 bis, 7526 

 (several), 7527 (i), 7530 (few), 7530 bis (few 

 living), 7531 (few), 7532 (few), 7534 (many in 



Crepidula plana Continued. 



Polyniccs shells, i in Littorina shell), 7537 

 (many), 7538 (many), 7540 (r in Ilyanassa 

 shell), 7541 (few shells), 7541 bis (few shells), 

 7542 (many), 7543, 7543 bis (many living), 7544 

 (few), 7545 bis (i small), 7546 bis (living), 7547 

 (few shells), 7547 bis (living), 7548 (few shells), 

 7549 (few shells), 7549 bis (many living in 

 Polynices heros shells), 7550 (many), 7551 (many 

 in Polynices shells), 7551 bis (few living and 

 shells), 7552 (few shells), 7552 bis (few shells), 

 7554 (many small in Polynices shells), 7556 (few 

 in Polynices), 7556 bis (numerous shells), 7557 

 (many in and on shellsof Polynices heros and P. 

 duplicata), 7558 (few shells), 7559 (many in and 

 on shells of P. heros and P. duplicata), 7561 

 (many in and on shellsof P. heros and P. dupli- 

 cata), 7563 (many: some on the outside of 

 shells), 7563 bis (few shells), 7564(several; some 

 on the outside of shells), 7564 bis (living and 

 shells), 7565 (i shell), 7565 bis (several shells), 

 7566 (few shells), 7567 (few shells), 7568 (few 

 shells), 7569 (few shells), 7570, 7571 (i shell), 

 7572 (few shells), 7574 (few), 7576 (in Poly- 

 nices shells), 7577 (few), 7578 (many living 

 in Polynices shells), 7579 (many living in 

 Polynices shells), 7581 (i), 7582 (several), 

 7583 (few shells), 7584 (few), 7585 (few 

 shells), 7587 (i shell), 7592 (many in Poly- 

 nices shells), 7595 (few), 7597 (few shells), 

 7598 (few shells), 7602 (i shell), 7609 (in Poly- 

 nices shells), 7612 (i small), 7613 (i shell), 

 7614 (few shells), 7615 (few shells), 7617 (many 

 living), 7620 (few shells), 7621 (many living 

 and shells), 7624 (few shells), 7625 (few shells), 

 7626 (few shells), 7627 (few shells), 7628 (many 

 shells), 7629 (few shells), 7630 (many small 

 shells), 7631 (common living), 7632 (many 

 living and shells), 7633 (few), 7634 (several), 

 7635 (many shells), 7636 (i living), 7638 (sev- 

 eral living), 7639 (few shells), 7640 (few living), 

 7641 (few living), 7643 (i shell), 7644 (few 

 shells), 7645 (i shell), 7647 (i shell), 7648 (many 

 living and shells), 7651 (few shells), 7652 

 (few), 7653, 7655 (i shell), 7656 (few shells), 

 7657 (few shells), 7658, 7659 (few shells), 7660 

 (many living), 7661 (many living and shells), 

 7663 (many shells), 7664 (many living), 7665 

 (several living), 7668 (few shells), 7672 (sev- 

 eral living and shells), 7674 (few shells), 7675 

 (few shells), 7676 (living in Polynices shells), 

 7677 (living in Polyniccs shells), 7678 (many liv- 

 ing in Polynices, also shells), 7679 (living and 

 many shells), 7680 (very abundant), 7681 (liv- 

 ing abundant), 7683 (few living), 7695 (i shell), 



