422 MAZATLAN UNIVALVES 



and a broken adult sp. shewing the lip. This, when perfect, 

 must have had 7 normal whirls. [One of Mr. Hanley's speci- 

 mens, though small, has the peritreme continuously developed, 

 and shaped as in Chr. communis.] 



509. CHEYSALLIDA REIGENI, n. s. 



Chr. t. forma et sculpturd " Chr. telescopio" simulante, sed 

 basi rotundatd, vertice nucleoso ut in " Chr.fasciatd" celato. 



One specimen only, somewhat broken and immature, was 

 found of this species, which is named in remembrance of 

 the gentleman to whose almost unparalleled zeal we owe the 

 immense collection, a very small part of which is here described. 

 A minute umbilical chink is seen, probably from a fracture of 

 the labiuni over one of the basal strias. Long. '057, long. spir. 

 034, lat. '028, div. 26. 

 Hob. Mazatlan ; 1 sp. off Spondylus ; L'pool Col. 



Tablet 1979 contains the specimen. 



510. CHRYSALLIDA EFFUSA, n. s. 



Chr. t. ovoided, albidd, effusa ; marginibus spirce excurvatis ; 

 vertice nucleoso ?... ; anfr. t'w.paruinplanatis, lirulis spiralibus 

 acutis viii. cinctd, quorum iv. in spird, a lirulis transversis, sibi 

 parallelis, in lineis declivibus ad verticem ascendentibus, acutior- 

 ibus, decussates, ad intersectiones nodoscs ; una extans suturam 

 continued ; alterce in basin valde productam ; striulis iii. ad 

 regionem umbilicalem ; lirulis transversis juxta suturam im- 

 pressam declivibus, evanescentibus ; interslitiis basalibus latis 

 distanter tenuissime decussatis ; labro ad basin valde sinuato, 

 effuso ; plied celatd, parvd, acutd. 



Of this species, the most delicately sculptured in the group, 

 only one not quite mature specimen was found, the vertex of 

 which is unfortunately injured. The transverse riblets are 

 parallel to each other, not to the margins of he whirls, and 

 vary in number accordingly. The structure of the sutural 

 groove is as in Chr. telescopium. Long. "09, long. spir. '054. 

 lat. '038, div. 20. 

 Hab. Mazatlan ; 1 sp. off Charna ; L'pool Col. 



Tablet 1980 contains the specimen ; also a very young shell, 

 with a sunken apex, which might have developed into this 

 species or into a slender form of Chr. fasciata. 



