328 RECORDS OF THE AUSTRALIAN MUSEUM. 



Sp. Char. — Shell more or less naticiform, sub-globose; spire 

 slightly elevated ; test thick. AVhorls four, the posterior globose 

 and straight walled ; sutures channeled ; body whorl much ex- 

 ceeding the others in size, inflated, convex above ; inner lip 

 reflected and slightly channeled oi- grooved. Sculpture when 

 unworn of spiral, equidistant slightly wavy ridges separated by 

 wider valleys, and the whole crossed by a variable number of 

 oblique coste, which on the posterior whorls pass from suture to 

 suture, but on the body who]-l are confined to the posterior con 

 vex surface only ; the points of intersection are minutely nodose^ 

 whilst the crossing of these two systems of ridges converts the 

 valleys into a series of small quadrangular spaces. When 

 weathered the minute nodes become worn off leaving small 

 depressions, and these, added to the already mentioned quadran- 

 gular spaces give to this superinduced sculpture, a highly ornate 

 appearance. 



Obs. — This little naticiform shell is by no means uncommon in 

 the Pachydomella calcareous mud stone, although this is, to me, 

 its first occurrence in the northern extension of our Lower Cre- 

 taceous. 



The costaj appear to be very variable in number, indeed one 

 specimen is provided with so few as to almost separate it from 

 the remainder. When completely divested of the sculpture layei-s 

 and the mouth imperfect, it is almost impossible to distinguish 

 V. (?) stnarti from Pmudmnaura variabilis, Moore, sp.-° 



Genus Anisomvon, Meek and Hayden, 1860. 

 (Am. Journ. Sci., (2), xxix., 1860, p. 35). 



AnISOMYON (?) DEPRESSUS, sj). HOV. 



(Plate Ix., figs. 13 and U). 



S^)- Char. — Shell ovate-elliptical, patelliform, depressed, the ends 

 not equally broad ; lateral margins sub-parallel, converging 

 slightly towards the posterior (?) ; apex depressed, obtuse, nearly 

 central ; both anterior and posterior slopes convex, the former (?) 

 the more abrupt. 



Obs. — I take the present oppoi'tunity of figuring a shell not 

 comprised in the Elomfield collection, because although in a 

 poor condition it entirely differs from both the Patelliform shells 

 previously described. The name Anisomyon is applied to it solely 



20 Etlieridfio— Mem. Gcol. Survey N. .S.Wales, Pal. No. 11, 1902, p. 40. 



