8 ART. 2. — II. YABE : CRETACEOUS 



wide, being about one tliird the diameter of the last vohition. 

 Surfîice with ribs and spines, the former arranged in two series 

 and the latter in four rows. The ribs on the upper part of the 

 whorl are numerous and flat, separated by wide intervals ; they 

 are oblique, bending strongly forward, distinct near the external 

 side, ])ut gradually becoming feeble townixl the umbilicus. Each 

 of these ribs bears tliree short spines, close to the external side ; 

 they are moderately sharp and compressed in the spiral direction. 

 The external surface of the whorl shows a second series of ribs 

 which are much broader than those of the first series and al)Out 

 a half their numl)er. The ribs of this series are also slightly 

 oblique and somewhat concave in front, with flat intervals of 

 almost the same width as the ri])s themselves. The middle portion 

 of each of these ribs on the body whorl carries a long spine. 

 The sj^ines are more or less trigonal in a transverse section, 

 rounded behind, and flattened in front. Their surface is orna- 

 mented with fine lines of growth, in addition to a delicate median 

 line on the flat side. Most of the spines on the other whorls 

 have been cast off, and the remaining basal portions which look 

 like tubercles are usually covered with a thin calcareous layer. 

 The umbilical side of the whorl is smooth while the basal sur- 

 face shows the impression corresponding to the surface marking 

 of the upper side of the foregoing volution. 



The specimen is unfortunately not in a condition to show 

 the position of the siphuncle, nor all the ramifications of the 

 lobes and saddles which are only partly thougli distinctly seen 

 on the whorl near the apex. 



T. Komotai is related to T. Cunliffianus Stol.'^ from the 

 Utatur Group of Odium, South India, although the distinction 



1) Stqmczka: Cret. S. Indiii, p. 190, pi. LXXXIX. 

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