PLEUROTOMARIA. 185 



whorls. The walls are ant^iilated obtusely above the middle, 

 and the fissure-band upon the under side of it is still above 

 tlie middle. It is wide, and so is the fissure itself, which 

 occupies half of the last whorl in lenj^th. 



4. RuMPirii, f, 1, 2, Schepman.— Maxima subdepressa, 

 concentrice leviter rugata (anfractibus superioribus valide), 

 flavide carnea, flammulis rubris aurantiis et subpurpureis 

 concentrice variegata, profunde umbilicata ; anfractibus con- 

 vexiusculis supra medium suban«>ulatis ; cicatrice supra- 

 mediana angustissima, elongatissima ; apertura oblique 

 subquadrangulari, columella oblique curva, margine basali 

 aperturse coufluenti : 170 alt. x 190 lat.; fiss. 230 x 2 J- 

 mil. — This fine shell is deeply uml)ilicated, has the 

 whorls slightly angular above the middle, and has a supra- 

 medial fissure, in these respects resembling P. Adansoniana, 

 tlian which it is more than twice as large. While it is the 

 largest, it is also the smoothest of the four species, the slight 

 concentric wrinkles of tlie upper whorls becoming less distinct 

 and almost lost in the lower. The fissure is narrow in 

 proportion to the size of the shell, and in length occupies 

 more than half the circumference of the last whorl. 



