38 On 71(10 Japaness Marine J]follusca. 



mella oblique miiltiplicatara, postice tenuiter callosa, antice 

 rectiuscula. 

 Long. 46, lat. 31 mm. 



JIab. Kii, Japan. 



This closely ridged Dolium is more pyriform than its con- 

 geners, and its flattened peristome is strongly and closely 

 plicated. 1 liave only seen one specimen of the species. 



Lima oshimensis, sp. n. (PI. II. fig. 10.) 



Testa ovata, leviter inflata, alba, liris radiantibus angustis planu- 

 latis confertissimis iuterdum confluentibus, interstitiis leviter 

 crenulatis et puncturatis instructa, concentrice irregulariter 

 liratim fasciata ; periostraciim ferrugiiieum, scabrosum ; auriculis 

 anticis parviusculis, posticis paulo latioribiis ; iimbones leviter 

 prominentes, incurvati ; area cardinalis latiuscula, leviter coa- 

 cava ; ligamentum trigonum, latiusculum. 



TJmbono-marg. 45, antero-post. 40 mm. 



Ilab. Osliima. 



Here is an interesting addition to the genus Lima, of which 

 I have only seen a single specimen. It is of a regular ovate 

 form, but little inflated, veiy closely ribbed, the ribs being- 

 narrow and flattened and in some cases confluent, while the 

 scabrous periostraeuni is formed in thin concentric ridges. 



P lacuna nomi a radiata, sp. n. (PL II. fig. 15.) 



Testa orbicularis, plana, tenuis, valva sinistra albida ferrugineo 

 late radiata, subtilissime rugulosa : umbo parvus, acutus, pone 

 marginem dorsali locatus ; valva dextra tenuissima, albo-nitens, 

 foramen oblongum. 



Long. 34, lat. 34 mm. 



Hah. lyo. 



A flat shell of delicate substance, the left valve being for 

 the most part smooth, but in some jjlaces minutely rugose. 

 Tlie only specimen I have seen is characterized by four 

 rather broad rays. 



Macoma awajiensis, sp. n. (PL II. fig. 11.) 



Testa transverse oblonga, tenuissima, compressiuscula, albo- 

 iridescens, concentrice subtiliter striata, postice obtuse angulata ; 

 area postica striis concentricis numerosis tenuissiinis sculpta ; 

 uaibonos parvi, vix elevati, appro ximati, post medium locati ; 

 ■ margo dorsalis anticus leviter arcuatus, posticus oblique de- 

 scetidens ; ventralis suboblique arcuatus, postice leviter- sinuatus ; 



