45 



Dimensions of a largisli specimen, length and breadth, 

 three and a-half inches; a large spine of the same, one inch. 



Locality and Horizon. — Upper Aiding series at Adelaide, 

 Hallett's Cove, and Aldinga. 



This very handsome shell has much the appearance of a 

 Spondylus, to which genus I had referred it until I succeeded 

 in obtaining a specimen with a perfect umbonal region. The 

 test in the umbonal region is very thin, and often destroyed, 

 otherwise it is fairly thick ; and as the matrix is very hard, it 

 is impossible to work out the hinge. 



Cassis textilis, spec. nov. 



Shell ovate, ventricose, whorls seven, varices at successive 

 intervals of about two-thirds of a whorl. Surface ornamented 

 with numerous longitudinal threads crossed by folds of growth. 

 Last whorl bearing on the superior angle a row of (9-10) 

 nodular tubercles, and on the medial portions two others equi- 

 distantly placed, the tubercles of which are smaller, much more 

 so are those of the third row. Spire short conic. Columellar 

 callus dentate ; outer lip thickened, margin plain ; columella 

 very tortuous beneath the callus, canal recurved. 



Dimensions. — Total length, 45 ; breadth, 32 ; thickness, 29 ; 

 length of aperture, 31 millimetres. 



This fossil bears much resemblance to C. jimbriatus of South 

 Australian waters, but differs from it in being more ventricose 

 with a much shorter aperture, in the spiral ornamentation, and 

 in possessing three rows of tubercles. 



Locality and Horizon. — The type is from the gastropod-bed 

 beneath the oyster banks of the Upper Murravian, near 

 Morgan, on the E>iver Murray. Casts of much larger size, 

 which may reasonably be referred to C. textilis, occur in the 

 Upper Aldinga series at Aldinga, Adelaide, and the Bunda 

 cliffs of the Great Australian Bight ; also in the craggy lime- 

 stones at Mannum, on the River Murray. 



Turritella Aldingse, spec. nov. 



Shell acutely pyramidal, a little more than three times as 

 long as broad, with three prominent ribs. AVhorls about 20 

 in a length of 35 millimetres, subangular or flattish, separated 

 by a moderately-impressed suture. Base flattened, ornamented 

 with many spiral, unequal-sized threads, which are crossed by 

 very fine radial striae. Aperture subquadrate, margins united 

 by a thick callus, which extends over much of the base ; outer 

 lip deeply and broadly sinuated. 



The ornament on the whorls varies much in different speci- 

 mens as well as in different parts of the same shell. 



The medium prominent rib is generally granulose ; the pos- 

 terior rib is bisulcated, or not infrequently replaced by two 



