PLATE XLVI— Contlnaed. 



NUCULA VAKICOSA. 



Page SI9. 



See Plate 93. 



Fig. ' 12. A left v&Ive, natural size. 



Hamilton group. Shore of Cayuga lake, N. T. 

 Fig. 13. An enlaixement from the precedingBpepiniftf.-ji / mi 

 Fig. 14. A rijflit valve, natural size, witii more prominent umbo and beak than the preceding. 



Hamilton gi-oup. Shore of Cayuga lake, N. Y. 

 Fig. 15. An enlargement from fig. 14. '"'■'''''■' '' ' ' ' ' l '^ 

 Pigs. 16,17. Enlargements of left valves. .fij: •.-, 



Fig. 18. An eularg<>ment of a left valve with an unusual gibbosity of flilf!*wSlBtf.*"' • 



Hamilton group. Shore of Cayuga lake, N. Y. ■^l^^■>■<•'A >i<>JlinmH 

 Fig. I'i X len valve, ifftusually elongate fi-om tlie beak to the post-batol eifi^eittfty'.'etilarged. 

 Fig. 20. A right valve of the usual foi-m of the specie-s enlarged. • ; ; . ^ 



Fig. 21. An enlargement fi-om a specimen of unusual length fi-om the beak to the poRt-inferyoreJtti-enHtjf. 

 Fig. 22. An enlargement of the cardinal ai-ea showing the tine crenulations of the hinge. ' ' ' ■' ■'^' ' 



Hamilton group. Shore of Canaudaigua lake, N. Y. "' ''^■"'' ^ •* ■«''' 



Fig. 23. An enlargement from the surface of the specimen, tig. 1?). 



Hamilton ^-ou^i. Shore of Cayuga lake, N. Y. 'intasq. A .V .•giH 



NdCULA CORBULIFORMI8.' "1" ^',' 



• iVi)\ o«y»ijIfftge 319. .qutrr^ ni>}IimaH 



Fig. 24. An individual, natural size. 



Hamilton gi-ouj). -Shore elf OvDOatolake, \N. YJ. 

 Fig. 25. A left valve of a larger individual. 



liii \m\k-~\i.,^ uii, HaniiltiMi group. Bellona, Yates Co., ^. Y. 



26. A right valve, with the umbo more elevated than usual, partly from compressiOD. 



Hamilton gi-«)up^ Belioiia, JS- Y. ,,^ ,, ,, ..,;,, m 



Fig, , 27^; AnenlBr^isenl.,fi:Qni tig. 34, showiqg more distiijctly th^ s^ju^ cjij^i^ters.^^ j^^j j^ ^ ^ 

 Fig. 28. A left valve, enlarged. 



Hamilton gi-oup. , Shore pfSkaneaieles Iqke, N. Y. ^ .„ 



Fig. 2i*. An enlargement of a left valve. .. „. ..™»j.i_ i 



Hamilton gi-oup. Shore of Cayuga lake, N. i. 

 Fig. 30. An enlargement from fig. 25. 

 Fig. 31. A right valve, enlarged. 



Hamilton group. Bellona, Yates Co., N. Y. 

 Fig. 32. A right valve, enlarged to two diameters. 



Hamilton group. Ludlovmlle, N. Y. 

 Pig. 33. An enlargement of a left valve, which is more equilateral than the prevailing forms. 



Hamilton group. Near Tully, N. Y. 

 Fig. 34. An enlargement from fig. 26, showing a few crenulations on the posterior part of the hinge. 



Pig 



