! \ 



j////s II. vV A. A i) M ,11., ii. p. 



1 -iKitcf/n of am!. 



Shell ovate or oblong, solid, compact ami ii , \\ith short, 



conical spire. Aperture two-thirds as long as the .shell .,r more, 

 narrow above, rounded below, tin- ro/////////// benrhnj a massive bi- 

 fabcd spiral fold, outwardly curving into tin- I..W.T margin of the 

 peristome ; parietal wall Iteming one or more smaller folds. Oper- 

 ciilum (pi. 4i), figs. 17, 18) "transverse, elongated with im- 



bricate elements and a linear scar." Type S. tolidula L. 



Anatomy and dentition unknown. This genus differs from 

 Actceon by its more solid shell, and massive, bilobed, < olnmeUv 

 fold. Tlie species are all from subtropical and southern tenifierate 

 Indo-Pacific seas; a few species extending northward to Japan, and 

 others south to South Australia and New Zealand. The Americas 

 have as yet furnished no species. 



This group has usually borne the name #//>r;'////u> f introduced 

 into binomial literature by the Adams' brothers. Plancus, in his 

 original publication " Jani Planci Ariminensis de Conchis minus 

 notis, etc.," (Venice, 1739), gives the phrase-name " !?//''//,/////.* Lti- 

 toris Ariminensis 0/ii'n Xm-lfiim irumlam" to what is prob- 

 ably a discolored Action tornatilis, for no other shell of that 

 aspect is found in the Adriatic, and at all events it is a form with 

 absolutely simple columellar fold. In the second edition (Rome, 

 1760) it is called " Bucdnum medium macuKsfuicu etflavis don> 

 ex littore Arwiinerwi" but in the explanation of plates he repeats 

 the earlier comparison with an olive stone. Of course the 

 ulus" is not used in a generic sense. Schumacher's name l><vtylus 

 had previously been used by both Klein and Humphrey, but not in 

 an acceptable manner. 



S. STRIGOSA Gould. PI. 20A, figs. 60, 61. 



Shell ellipsoidal, elongated, rather solid, grooved l>\ revolving 

 punctured sulci, the interspaces chain-patterned with brown and 

 whitish, and ornamented with median, sntnral and basal bands of 

 whitish. Whorls 5, the last t hive-fourths the length of the shell. 

 Aperture two-thirds the length of the shell, very narrow ; columella 

 deeply excavated. Alt. S, diam. :> mill. (Old.) 



Loo Choo and Knyosima (Stimp.) ; Nagasaki (Birileft) ; Tokyo 

 (Fr. Stearns). 



