346 PKOCEEDIXGS OF THE GEOLOGICAL SOCIETY. [April 24, 



Ammonites Daintkeei, Etheridge. PI. XXIV. 



Shell discoidal; whorls depressed or flattened at the sides, with 

 a rather narrow rounded back. The sides of the shell ornamented 

 with numerous nearly equal and closely arranged ribs, aU of which 

 are slightly arcuated and pass over the back or dorsal edge ; um.- 

 bilicus wide and deep, allowing half the inner whorls to be exposed ; 

 sides of the whorls around the umbilicus steep-sided, rounded, or 

 subangular ; aperture broadly oval, the outer whorl embracing two 

 thirds of the next inner whorl. The ribs at the terminal portion of 

 the last or body-chamber are somewhat unequal and coarser. 



Ohs. I have searched every available source for information rela- 

 tive to this shell, and cannot recognize any species approaching it in 

 the Cretaceous rocks of Europe, India, or America. It has some 

 affinity with A. asterianus, D'Orb., but wants the tubercle around 

 the umbilicus ; and the ribs are greatly bent or slightly sigmoidal, 

 whereas in A. astei'ianus they are straight. It also resembles 

 some forms or varieties of A. Hervei/i in the ribs, but is not so 

 tumid a shell. It occurs associated with A. Beudanti, D'Orb., 

 Ancyloceras, and Inocerami in the Hughenden beds, which cer- 

 tainly appear to be Lower Cretaceous, or not younger than the 

 Gault; the scantiness of the known fauna, however, does not allow 

 us to assign the fossil remains to a definite horizon, such as Neo- 

 comian or Gault. Figure reduced ^. 



Loc. Hughenden. Form. Lower Cretaceous. 



AviCTTLA httghen-denejstsis. Ether. PI. XXV. fig. 3. 



Shell oblique ; umbones incurved ; ears unequal ; posterior ear 

 long, anterior short ; cardinal line straight ; ventral margin broadly 

 convex or rounded ; surface of shell exhibiting a large number of 

 slightly wavy or undulating vertical ribs or costse, and many con- 

 centric undulating wavy folds, partly due to lines of growth ; an- 

 terior side slightly concave near the ear, afterwards becoming 

 curved and convex continuously with the base ; surface highly polished 

 in all the specimens. 



066'. This shell appears to have been very abundant and, jperha^s^ 

 gregarious, masses of them occurring together, forming a compact 

 and dense argillaceous limestone. I cannot refer it to any knowii 

 species. 



Loc. Hughenden station. Form. Cretaceous. 



ASPIDORHTNCHUS, Sp. ? 



The caudal portion of the vertebral column, tail, and several of 

 the peculiar elongated scales of this genus occur in the Hughenden 

 collection. 



Oolitic. 

 Belemnites. 



From Belcombe Creek, Black Downs, have been derived two, if 



