78 ART. 2. S. TOKUNAGA. 



The following seven species are found in latitudes both 

 north and south of Japan, and for the most part are world- 

 wide in distribution : 



Martesia striata Linné ; Saxicava arctica Desh.; Saxidomus nuttali 

 Conrad.; Dosinia exoleta L.; Tapes decussata Dkr.; 'Lucina horea- 

 lis L.; Modiola modiolus Linné. 



The remaining ones are those found only in Japdn (or in 

 the same latitude in Eastern Asia). 



(I) Species chiefly found south of Tokyo : 



Fusus nodoso-plicatus Dkr.; Fusus simplex E. A. Smith ; Nassa japonica 

 Ad.; Erato callosa Ad. and Rve.; Columbella martensi IjKi:.; Colum- 

 bella pumila Dkr.; Cancellaria nodulifera Sow.; Terebra subtextilis 

 E. A. Smith ; Terebra cfr. serotina Ad. and Rve.; Pleurotoma sub- 

 auriformis E. A. Smith ; Pleurotoma raricostata Smith ; Natica 

 ampla Rve.; Odostomia fasciata Dkr.; Odostomia planata Gld.; 

 Pyramidella einetella A. Ad.; Acmœa eonulus Dkr.; Tornatina ex- 

 ilis Dkr.; Dentalium cfr. weinkauffi Dkr.; Nœera gouldiana Hinds ; 

 Mijodora fluctuosa Gld.; Mactra veneriformis Dbsh.; Maetra crossei 

 Dkr.; Tellina nitidula Dkr.; Tellina jjcdoensis Lke.; Tellina rutile 

 Dkr.; Tellina nipponica Tok.; Lutraria ovalis Tok.; Cyclina ehinensis 

 Chem.; Tapes cuglyptus Ph.; Nueiila mirabilis Hinds ; Area kago- 

 shimensis Tok.; Ostrea denselamellosa Lke. 



(II) Species chiefly ibund north of Tokyo : 



Trophon exiguus Tok.; Volutharpa perriji Jay ; Nueula insignis Gld.; 

 Terebra bipartita Gld.; Crgptodon flexuosus Mont.; Area rectangu- 

 laiHs Tok.; Modiola japonica Dkr.; Lima hnhodutensis Tok. 



(III) Species found both north and south of Tokyo. 



Murex faleatus Sow.; Fusus perplexus A. Ad.; Siphoncdia ,cassidarœfor- 

 mis Rve.; Eburna japonica Sow.; (livella consobrina Lke.; Pleuro- 

 toma principalis Pilshky ; Natica papgracea Brsii.; Pot am i des zonale 

 Brug ; Rotella costata Lesson ; Trochus imperialis A. Ad.; Trochus 



