148 Art - 6 — M - Yokoyaina : 



Living. — Central Japan (Sagami Bay at 4C0 fathoms); South- 

 eastern Japan at 750 fathoms (Challenger); Patagonia. 



188. Lima zushiensis, Yokoyama. 

 Pl. XII. Fig. 8. 



This species is closely related to Lima squamosa Lam. (Lisch- 

 ke, Jap. Meeresconch., I, p. 102) living near cur coast and ako 

 in the Indian and Atlantic cceans. In spite, however, of only a 

 fe^Y, rather imperfect specimens which we possess, their dif- 

 ference is tolerably obvious. One of the fossil specimens measur- 

 ing about 50 millim. in height possesses thirly-two ribs and ano- 

 ther about 40 millim. in height twenty-seven ribs, so that the 

 number of ribs is decidedly greater than in Lima squamosa Lam. 

 which possesses onlylwenly to twenty-four. Indeed, in this res- 

 feet, the fossil form comes between the Lamarckian species and 

 Lima mvlticostata Sow. (Thes. Conch., I, p. 85, pl. XXII, fig. 38) 

 of the Mediterranean, which latter has about thirty five ribs. 

 Moreover, our fossil species, when compared with these living ones, 

 has the ribs somewhat flatter and less distinctly scaly. But it 

 must be confessed that there is a great possibility of the former 

 being a mere variety either of the Lamarckian or of Sowerby 

 species. 



A full description of the species will be postponed until better 

 specimens can be obtained. 



Fossil occurrence. — Yokosuka Zone (Zushi). 



189. Lima angulata, Sowerby. 

 Pl. XII. Fig. 12. 



Lima angulata. Sowerby, Thes. Conch., vol. II, 80, pl. XXI, figs 39, 10. 



J.ima lasilanica. Adams and Reeve, Voy. Samaiaug, Zoology, p. 75, pl. XXI, fig. 6. 



Lima orientalis. Adams and Eeeve, op. cit., p. 75, pl. XXII, fig. 7. 



Lima halodatensis. Tokunaga, Fcss. Env. Tokyo, p. 64, pl. Ill, fig. 2G. 



A single 'left valve, partly broken, thin and fragile, modera- 

 tely swollen, obliquely oval in outline, obtusely subangulate at 

 postero-ventral corner, with small, nearly equal ears. The surface 



