THE NAUTILUS. 11 



should be known. While I am strongly opposed to changing old 

 names except for t lie best of reasons, it is necessary to know what 

 the authorities are doing in these particulars. 



My object in sending out this circular is to invite all who are in- 

 terested in this matter to assist in the work of revision. I shall be 

 grateful to all who have found difficulties in using " West Coast 

 Shells " if they will write to me concerning their difficulties and 

 make suggestions as to improvements. 



I wish also to be informed of any errors, either in names or de- 

 scriptions, that have been discovered, and shall be thankful to receive 

 suggestions that would be helpful in writing new descriptions. In- 

 formation concerning new species is especially desired; also any 

 recently discovered facts concerning well-known species. 



I would be especially grateful to those who have specimens of new 

 species if they Mould loan me such as I do not already possess, and 

 give me information as to the names, localities, etc., of any species 

 which are not already mentioned in " West Coast Shells," or of any 

 unusual varieties that should be noticed. 



Josiah Keep. 



Mills College P. 0., Alameda Co., Calif., March 21, 1900. 



NOTICES OF SOME NEW JAPANESE MOLLUSKS. 



BY H. A. PILSBIJY, 



The following species were mostly sent by Mr. Y. Hirase. They 

 will be illustrated in the Proceedings of the Academy of Natural 

 Science. 



FAilota horrida n. sp. Shell broadly and perspectively umbilicaled. 

 depressed, tffe spire very low conoid, nearly flat, periphery angulated, 

 the angle situated high, base convex, inflated. Surface dull, yellow- 

 ish-brown, shaggy with epidermal flattened processes and filaments, 

 which are arrayed in six or eight concentric series, on the base, and 

 at the periphery; the upper surface smoother. Whorls b~. Aper- 

 ture oblique, subcircular, a little excised by the preceding whorl; 

 peristome thin, slightly expanded on the outer and basal margins. 

 Alt. 6, diam. 14, umbilicus 4 mm. Allied to H. ciliosa Pfr. and 

 probably to //. setocincta A. Ad., but the spire is 1< wer. 



Eulota (Trisfiopltta?) mesogonia n. sp. Shell umbilicate, with 



