THE XAUTILU8. 89 



the hint of a lightish band may be seen from the edge of the outer 



lip, inward. 



Dimensions : Altitude, 6*25 mm. ; latitude, 4* mm, 



Manta, Ecuador ; collected by Dr. W. H. Jones, United States 



Navy. This is the first example of the genus detected on the west 



coast of the American Continent. Published by name only in my 



list as below.^ 



NOTE ON ACM^A SACCHARINA (LINNE.) 



BY REV. GEO. W. TAYLOR. 



I have lately had an opportunity of examining several hundred 

 specimens of Acmcea saccharina (Linne) and have come to the 

 conclusion that it is a species that varies comparatively little, and 

 that Mr. Pilsbry is wrong in supposing (see Manual of Conchology, 

 vol. XIII, p. 50) that A. stellaria Rve. or A. octoradiata Hutton or 

 his own A.j^erplexa are forms of it. 



A. saccharina is nearly always distinctly seven rayed. It is 

 common on the Chinese and Japanese coasts but has not been noticed 

 by me in collections from the South Pacific Islands. 



A. stellaria Rve. is an eight rayed species. It was described I 

 think from New Holland ; my own specimens are from Raratonga 

 and I suppose it to be a species of the South Pacific fauna. Reeve's 

 figures are very good and are copied by Pilsbry, pi. 36. The shell 

 figured by the same author on pi. 61, fig. 65 is also of this species as 

 Mr. Pilsbry surmised (Manual of Conchology, XIII, 99). 



Acmcea perplexa Yilshry seems to me to be abundantly distinct 

 from either of the above named species. It is described as with 

 seven rays but figured with eight which is the correct number.^ It 

 is a well marked species quite unlike any other Acmcea known to me. 

 My specimens were collected in New South AVales from which 

 locality, by the Avay, I have shells which I refer to Acincea marmorata 

 T.-Woods, which much more nearly resembles saccharina than does 

 any specimen of perplexa I have seen. 



2 Vide Proc. U. S. Natural Museum, Vol. XIV., p. 326. "List of shells col- 

 lected on the west coast of South America, principally between latitudes 7° 30' 

 S., and 8° 49' N," e».c., 1891. 



* Mr. Taylor is correct in stating that A. perpkxa is always 8 rayed. The 

 statement that it had but seven was an error. — Ed. 



