r, 



J 



'rom Sta. Barbara, California. 



bus; ranali rccurvata ; lacuna umhilicali masna ; • labro intus 

 crebrilirato ; labio conspicuo, spiraliter rugose lirato. 



Hub. Sta Barbara, Pleistocene formation [Jewett). 



Col. Jewett's single specimen is in very fine condition, and is 

 confirmed by a fragment obtained by Mr. Gabb, the pala;onto- 

 loirist to the California State Survey. Althoiiu;h resemblinj' 

 Purjttira aperia and congeners in the irregular rugose folds of 

 the labium, and Sip/wiuilia in the strongly bent canal, Mr. II. 

 Adams considers that its affinities are closest with the Catdharus 

 group of Pisania. That genus is extremely abundant in the 

 tropical fauna, but does not now live in California. It is the 

 only distinctly tropical shell in the whole collection; and its 

 presence, along with so many boreal species and types, appears 

 somewhat anomalous, like the appearance of Valuta and Cassi- 

 daria in the Crag fauna. It is distiniiuished from the extreme 

 forms of /*. insifjuis by having the s|)iral lirse pretty ecjually dis- 

 tributed over the early whoils, by the close internal ribbing of 

 the labrum, by the absence of the stout posterior irietal tooth, 

 and by the great development of the columellar tuids. 



Note. — Unfortunately, during the long interval which has elapsed 

 between the transmission of the MS. and receipt of the j)roof, the 

 types have been returned to the owner, and (with tlie remainder of 

 Col. Jewett's invaluable collection of fossils) have beconje the pro- 

 perty of a college in New York State. As they are |)acked in l)o\es, 

 and at present inaccessible, I am unable to give the mea?urenients ; 

 but the unique specimens were drawn on wood by Mr. Suwerby for 

 the Saiithsuuiau lustiiutiou. — P. P. C, Montreal, Feb. '12, 1866. 



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