190 



separated by one and a-half to two times wider, flat, transversely 

 striated furrows. 



Aperture roundly oval, channelled at the front ; outer lip 

 smooth within ; columella slightly arched, inner lip reflected, 

 quite concealing the umbilical chink. 



Dime7isions. — Length, 6-5; greatest width, 3*0; height of 

 aperture, 2. 



Locality. — Eocene; glauconitic calciferous sand-rock, Bird-rock 

 Bluff", Spring Creek, near Geelong (1 ex.). 



7. Triehotropis apieilipata, spec. nov. 



Shell of moderate size, rather thin, turriculate, imperforate ; 

 whorls seven and a-half, of gradual increase, convex or medially 

 subangulated, ending in a subacute apex of two and a-half, small, 

 convex, lirate whorls. 



Spire-whorls four ; the spiral ornament consists of about ten 

 narrow threads, five on the posterior area are unequal and irregu- 

 larly disposed, the four on the front are stouter, equal and equi- 

 distant, the posterior one of which forms a slight angulation, 

 especially on the posterior whorls ; the transverse ornament con- 

 sists of oblique equidistant threads producing a rhomboidal 

 tessellation by intersection with the spirals which are slightly 

 crenulated. 



Body-whorl rounded with six irregular spirals on the posterior 

 slope, five prominent ones on the medial area, and five irregular 

 ones on the short, flattish, subangulated base ] the whole surface 

 crossed by sigmoid threads. 



Aperture rotund, channelled in front ; outer lip thin ; columella 

 nearly straight, inner lip reflected. 



Dime7isio7is. — Length, 9-75 ; greatest breadth, 4-5 ; height of 

 aperture, 3-0. 



Localities. — Bird Rock Bluff", Spring Creek ; blue clays Schnap- 

 per Point (2 exs.). 



8. Triehotropis interlineata, sjmc. nov. 



Shell of moderate size, rather thick, turriculate ; whorls convex 

 spirally lirate and transversely closely striated, embryonic whorls 

 lirate. 



Spire-whorls three, convex, slightly flattened at the posterior 

 suture : spirally ornamented with about 1 2 lirte, alternately large 

 and small, which are minutely serrated by regular, close-set, 

 oblique stripe. 



Body-whorl convex, rather tumid, with a regularly convex 

 base ; ornamented with subacute spiral threads, alternately large 

 and small, crossed by arched strite. 



Aperture rotund, rather broadly channelled at the front ; outer 



