PLATE XLlll—Con^imied. 



Fig. 27. Sfirorbis similis sp. nov., p. 242. Back view of operculum filled with 

 eggs. 



28. Spirorbis abnormis sp. nov., p. 245. Operculum showing one plate, 



the other being torn away. Embryos with large white patches which 

 filled the operculum are not represented. 



29. Front view of another operculum with 3 calcareous plates. 



30. Spirorbis fortnosus sp. nov., p. 251. Detached calcareous cylinder 



showing interior. 



31. Spirorbis similis sp. nov., p. 242. Front view of fig. 27, showing 



calcareous plate. 



32. Spirorbis granulafus {'L.'xnni),^. 2^^. Operculum filled with embryos, 



showing conspicuous white patches and primary calcareous plate on 

 the top, splitting from secondary one. Specimen from off New 

 England coast, in 1 10-120 fathoms. 

 All figures by the author, X 35- 



(345) 



