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is C />trsii'a Mi'Kill aiul iiulccd I tlo not think they arc s c p a r a 1) 1 ••. W {-. have two 

 specimens oi C. pcrsica aiul both have the upper part of the spire iiol (iniic so ])ointc(l as in 

 your shells, otlu-rwise I can Inul no cliltcrence". As tlu' nuclear whorls are so often more or 

 less eroded, this difference nia\- be of no trreat ini|)onance. Other differences I found with 

 the quoted figure are thai part of the Siboga-specinu;ns are considerabi)- larger (till 21 Mill. 

 in length, instead of 15) that the last whorl is often much more ventricose, the canal commonly 

 more slender and not so straight; as however main- of lhes(^ characters are slightly variable 

 in the Siboga specimens, I think it will be fit to accept Mr. .SMi-ni's views, as he was the 

 only person, able to make direct comparison. The species has also some resemblance with 

 C. Jeffrcysi^ but Mr. Smith says it is quite unlike and even a less typical specimen, with more 

 equal lirae, sent by Mr. Melvill for comparison, is very different in its particulars of sculpture. 



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