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. CHRYSALLIDA REIGENI, 2. s. 
A 
Chr. t. forma et sculpturd “Chr. telescopio” simulante, sed 
basi rotundatd, vertice nucleoso ut in “ Chr. fasciata” 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 labium over one of the basal strie. Long. °057,. long. spi. 
°034, dat. °028, dev. 26°. 
Hab.—Mazailan ; 1 sp. off Spondylus; Z’pool Col. 
Tablet 1979 contains the specimen. 
510. CHRYSALLIDA EFFUSA, 2. S. 
Chr. t. ovoided, albidd, effusé ; marginibus spire excurvates ; 
vertice nucleoso ?... ; anfr. tiv. parum planatis, lirulis'‘spiralibus 
acutis vill. cinctd, quarum iv. in spird, a lirulis transversis, sibi 
parallelis, in lineis declivibus ad verticem agcendentibus, acutior- 
zbus, decussate, ad intersectiones nodose ; una extans suturam 
continuat ; altere in basin valde productam ; striulis iu. ad 
vegionem umbilicalem ; lirulis transversis juata suturam tim- 
pressaim declivibus, evanescentibus ; interstitiis basalibus latis 
distanter tenuissime decussatis ; labyo ad basin valde sinuato, 
effuso; plied celatd, parva, 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 the 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°. 
Ffab.—Mazatlan ; 1 sp. off Chama; Z’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. 
