Fossils from the Mini» Pen insula and its Immediate North. 97 



mimerons concentric miser] lines, which rise into nodules, or 

 towards the margin form small arched lamella- in crossing the 

 radii." 



We possess two imperfect specimens, one of which measures 

 about 10 millim. in height and is shown in the figure. They 

 agree quite Avell with the above description, except in the 

 presence of "nodules" and lt small arched lamella? " towards the 

 margin, but it must be remembered that our specimens are 

 much worn by friction with coarse sands abounding in the layer 

 in which they were imbedded. 



Fossil occurrence. — Koshiba Zone (Koshiba). 



The living specimens of Fissurhlea tanneri are found on the 

 east coast of North America, between Delaware Bay and Cape 

 Hatteras in depths of 104-142 fathoms. 



Genus JPutiefurcllu. Lowe. 



11'2. Puncturella subconica,* Yokoyama. 



Pl. VI. Fig. 7. 



The shell is elevated-con ieal, oblong in outline with acuminate 

 involute vertex. The radiating riblets are alternately large and 

 small, number about thirty-six in alb and are crossed by coarse 

 unequal concentric lines of growth, making them appear sub- 

 nodose in well preserved specimens. The summit is nearly in the 

 middle pierced by a lanceolate fissure. Aperture oblong with 

 suhcrenulate margin. Height 5 millim., diameters millim. b}^ 4 

 millim. Three specimens. 



In shape this species is just like Piincturellafastigiata (Proc. 

 Zool. Soc, 1851, p. 228 and Thes. Conch., Ill, p. 208, figs. 15, 

 16) described by A. Adams from the Eastern Seas in which, how- 

 ever, the riblets are said to be equal. Puncturella conica Orb. 

 from Falkland Islands (Thes. Conch. IIP p. 208, pl. 245, figs. 1, 

 2) is very close to ours, the riblets being just as in the latter. 

 But the figure given in Thesaurus looks a little flatter. Strange 



* Puncturella conica Orb. in the list of shells given on p. 4 of my « Climatic Changes in 

 Japan since the Pliocene Epoch " refers to this species. 



