NO. 1177. XORTH AMERICAX LErTONACEA—DALI.. 897 



Fig. 3. Erycina periacopiana DM; left valve; 5.0 mm. Xo. 92227, U.S.N. M. North 

 Carolina. 



4. Myaella pedroana Dall ; 0.0 mm. No. 127565, U.S.N.M. C:ililoruia. The snb- 



umbonal projection between the lamina^ is the resilium. 



5. Sportella caJ}fornicaY>i\.\\; lo.Ovtim. No. 108231, U.S.N. M. The drawing repre- 



sents the right valve and the posterior projection of the hinge plate 

 carries the resilinm. 



6. Erycina fernandina Dall; 3.75 mm. No. 108230, U.S. X.M. Deep water off 



Florida. The dark spot to the right of the cardinal tooth is the resilium. 



7. Erycina Jinella Dall; -1.6 mm. No. 107863, U.S.N.M. North Carolina. 



8. MontacmaminiiscuhiTmU; 2.7 nmi. No. 92628, U.S.N.M. North Carolina. 



9. Sportella pihhryi Dall; 8.0 mm. No. 107864, U.S.N.M. Left valve. North 



Carolina. 



10. Bornia {Ceratobornia) lomjipes Stimjisou ; abont one and a half times natural 



size. From an unpublished drawing by Stimpson, representing the ani- 

 mal crawling, the right side facing the observer. South Carolina. Shell 

 is No. 107812 U.S.N.M. 



11. The same, representing the animal suspended by its byssal thread, the heel 



of the foot elongated. Drawn by Stimpson. 



12. Mysella planata Dall; 5.3 mm. No. 108234, U.S.N.M. Aleutian Islands. . The 



dark sjiot between the lamina- is the resilium. 



13. Bornia (Ceratobornia) lotK/ipa Stimpson; the posterior extremity, or heel, of 



the foot emitting the byssal thread. ;Much enlarged. From a drawing 

 by Stimpson. 



14. Myaella nwllcri Morch; 6.4 mm. No. 108232, U.S.N.M. From a specimen in 



the Jeffreys collection, named Moiituvuta elecata by Morch, and collected 

 by Torell in Greenland. 



Proc. N^. M. vol. xxi 57 



