10 



umbilical indentation ; aperture sub-circular ; lip bevelled, sharp, 

 blue black; submargin dead white; columella white, acute, with 

 two denticles at lower part ; fauces silvery white. 



Axis one and a half inches ; diameter one and one fourth inches. 



Inhabits San Diego. Lieut. Green. 



It has the shape, solidity, size, and coloring of T.fragarioides, Lk. 

 lugubris, Lk. It is distinguished by not having its colors arranged 

 in bands, in having an umbilical indentation, and two denticles on 

 the columella. 



MODULUS DORSUOSUS (PI. XIV. Fig. 12.) 



T. depressa^ovato-conica, solida, calcarea, ad peripheriam acuti et nodulosa, 

 supra obscure undulato-nodoso, infra conica, spiraliter insculpta ; apertura 

 sub-triangularis, labro acuto intus sulcato ; columella et dente rosaceis ; um- 

 bilico parvo, profundo. 



Shell small, solid, depressed, ovate conic, dead white, the upper 

 whorls as it were eroded, the outer one angulate, flattened or a 

 little excavate above, varied with obsolete radiating folds by which 

 the periphery is rendered nodulous ; the nodules extend somewhat 

 on the conical base which is sculptured by about six spiral grooves, 

 one of which cuts the nodules. There are sometimes faint traces 

 of dusky markings between the tubercles and on the basal ridges. 

 Aperture subtriangular, lip sharp, grooved within ; umbilicus small; 

 tooth and columella tinted pale rose-red. 



Diameters, transverse half an inch ; vertical nearly one third of 

 an inch. 



Found at Acapulco. Col. Jeivett. 



This species is not mentioned in M. Petit's recent list of the 

 species, but it approaches M. olliquus, and also M. duplicatus, both 

 of which are described as spirally grooved above, and the former 

 seems to have a sharp periphery. 



CHEMNITZIA TENUICULA (PI. XIV. Fig. 15.) 



T. gfacillima, lanceolata, nitida, cerina, infra suturam fuscescens ; anfr. 10 

 planulatis, tabulatis, longitudinaliter ad 20-plicatis, striis numerosis volventibus 

 leviter secatis ; basi modo spiraliter striata ; apertura angusta, ovata ; labro 

 acuto. 



Shell small, elongated lanceolate, turreted, rather solid, shining, 



