CEi'HALOrODA FROM THE JIOKKATDÔ. 13 



numerous, the last volution liaving 45, separated by intervals wider 

 than their breadth. l\ibs uniform in size except on the upper 

 border of the whorl, where the tuberculatud ones become thicker, 

 while the smooth ones become more faint ; arranged obliquely, 

 curving backward ou the lower l)order and forward on the upper. 

 fSome of the ribs bear four tubercles or more coi'rectly rounded 

 spines which form four horizontal rows, two on the upper border, 

 one in the middle of the external side and another on the lower 

 border, and these tul)crculated ribs altei'uate Avith 1-4 smooth 

 ones. Tubercles subeipial in size. Internal side of the whorl 

 nearly smooth. 



Of tlii^5 species there is a non-septete fragment of moderately 

 large size composed of two circuits, of which the posterior circuit 

 and one half of the other are very close together although not 

 quite in contact, while the remaining half is detached from the 

 other part. The specimen is represented in pi. III., fig. 5. 



The second example, which proba1-)ly belongs to the same 

 species, is a young shell, very loosely twisted and ornamented 

 with distinct, narrow^ oblique ribs alternately bearing two short 

 spines on the upper border (fig. 6). 



I have not yet seen the suture line of this species, but the 

 other characters are enough to distinguish it from any known 

 species of Turrilites. The nearest approach to the Japanese form 

 is made by T. Reussianus D'Orbigny, from which it differs in 

 having very oblique, fiexuous and subequal ribs. Still their 

 resemblance is so great that they must be considered as closely 

 allied forms. 



T. HeussiauLis is placed by Schlütek^^ under the genus 



1) C. SchlCter: Cepluilopoden d. oberen deutsch. Kreide. IST!. P. lO'J, pi. XXXII., 

 iigä. lo-21 ; pl. XXXIII., lig. 1. — A. Fiarricii u. U. Sculoknjî.vcu : Cei>li. d. böli m. Kreidet". 



