02 Art. G.— M. Yokoyama : 



parts. On the body-whorl there is a fifth lira at the periphery 

 which is subangular. The oblique strise are sharp, numerous, 

 narrower than interspaces, crossing the spiral lirœ with points of 

 intersection nodose. Base flatly convex, with two spiral lirœ 

 close to the periphery and some indistinct ones in the middle 

 portion crossed by lines of growth. Umbilicus wide, funnel-like, 

 bordered by two rows of granulated threads, the outer one of 

 which forms the angular margin, with lines of growth within the 

 umbilicus rather coarse. Aperture subcircular, very slightly sub- 

 angular below. 



I believe, this is one of the many forms of Margarita cinerea 

 which is said to be very variable. The Japanese fossil looks very 

 much like fig. 54 (pi. 04) of Pïlsbry. 



Fossil occurrence. — Miyata Zone (Kami-Miyata). 



Living. — Behring Sea, North Atlantic (Massachusetts ; 

 Hebrides and Norway and still northward). 



Genus Titrcica. A. Adams. 



108. Turcica imperialis, A. Adams. 



Pl. V. Fig. 31. 



turcica imperialis. A. Adams, Proc. Zool. Soc. Land., 1863, p. 507. Piesbry in Tryon's 

 Man. Conch., XI, p. 414, pl. 63, figs. 30, 31, 



Trochus imperialis. Lischee, Jap. Meeresconcn., Ill, p. 67, pl, IV, rigs. 5, 6. Tokonaga, 

 Foss. Env. Tokyo, p. 28, pl. I, fig. 60. 



Trochus àdamcianus. Schrenck, Moll. Aimu-1. u. d. nordjap. Meeres, p. 358, pl. XVI, 

 fig. 3. 



A fine specimen, 1 ( .) millim. in height and 16 milliin. in 

 diameter. Adams described this species as follows: — ■ 



"Shell eonoidal, spire acuminate, base obliquely produced, 

 solid; whorls somewhat convex, witli a strong nodulous cingulus 

 at periphery, and beaded lirulae alternating with elevated lines, 

 interstices obliquely striate; sutures canaliculate; furnished with a 

 series of granules above; base convex, furnished with concentric 

 granulöse cinguli. Aperture oblique, subcircular; columella 

 tortuous; terminating in a tooth; lip subexpanded, with entire 

 margin; inside smooth." 



