168 



5. Crucibulum PKCTiNATUM, u. s. Cf. t. coiiica, auranlta. tenut- 

 ore ; vertice nucleoso subadunco, pane separato, anfr. ii. sub- 

 tumentibus, sutura profunda, apice planato ; dein superficie lavi, 

 seu striis incrementi ; dein rugis radiantibus eztantibus, peracutis, 

 ad periodas incrementi laminis concentricis irregularibus inter- 

 ruptis, interdum valde distantibus, interdum interstitiis parvis ; 

 margine a rugis cavatis stellato ; cyatho {testą 1 adolescenti) 

 haud continuo. intus indentato, marginibus ad ang. 50° distantibus. 

 Long. M4, lat. -97, alt. -6 poli. 

 Hab. Peru. Sp. un. iu Mus. Cuming. 



This specimen is distinguished at once by its golden-orange colour, 

 rather thin growth, and by the characters of the ribs and cup. 

 The ribs are generally distant, always sharp, resembling a young 

 Siphonaria gigas ; and as the margins of growth are often left likę 

 cąves, a series of irregular pits are then formed as in Cr. imbricatum. 

 On one part of the shell are diagonal furrows, as in Cr. limbricatum, 

 var. Broderipii ; but įhis may be an accidental pecuharity. The 

 shape of the cup is as in the very young statė of the other species, 

 beiug a simple plate bent at an angle of 50° and there fastened at 

 the two extreniities to the inner surface of the shell. Other spe- 

 ciraens are in the British Museum coUection. 



6. Crucibulum AURicuLATUM, Chemu. 

 Patella auriculata, Chemn. Conch. Cab. 

 The Chemnitzian species is difficult to recognize. It is, however, 

 most probably the West Indian form, answeriug to Cr. umbrella, 

 Desh. (=C. rudis, Brod.). Perfect specimens are extremely rare in 

 coUections. Ou comparing a rather young shell in Mr. Cutning's 

 coUection (iu which the finer markings have beeu removed in the 

 beautifying process) with a series of Cr. umbrella from S.W. Mexico, 

 I can scarcely find a single point of specific diflference. The cup is 

 attached only at the base, is white throughout, angulated in what 

 would be the line of attachment, and indented along the inner 

 margin. The outside has about thirty rather irregular ribs, which 

 are neither sharp nor rounded. Colour whitish, speckled with brown. 

 A large series from each side of the continent should be compared 

 before the identity (or othervvise) of the species is decided. The 

 comparative uumber and sharpness of the ribs are the principai points 

 of difference. The colour varies greatly in the Pacific shells. 



7. Crucibulum ? imbricatum, var. Broderipii. 



= Cr. imbricatum, Brod. in Mus. Cuming: uon C. imbricata, 

 Brod. in Trans. Zool. Soc. pi. 27. f. 7. 

 Cr. 1 imbricatum, t. albida, solida, subcompressu, conica ; interstitiis 



costarum et laminarum incrementi interdum magnis, profundis, 



haud regularibus, interdum evanescentibus ; superficiei parte rugis 



diagonalibus crebrioribus instructa. 

 This shell, which has borne the name of Cr. imbricatum in the 

 Cumingian coUection, may not improbably be only a variety of that 

 species ; but as it offerš distinctive characters in its remarkable 



