586 PROFESSOR J. W. GREGORY ON SOME CRETACEOUS ECHINOIDEA 



No. 269. First Plateau ; two specimens, of which one has subcarinate posterior 

 ambulacrum more strongly developed than is shown in de Loriol's 

 fig. 4. 1., 261; b., 24; h., 20. 



No. 281. Collection of specimens from the Epiaster bed on the First Plateau on 

 the road to Hanha, south-west of the steep descent to the Hanha 

 basin ; one large specimen of the depressed variety has 1., 33 ; b., 30 ; 



h., 22. 



No. 288. Summit of Second Plateau ; south-west of the Epiaster bed, on road 

 to Hanha. A weathered cast. 1., 32 ; b., 27-g- ; h., 2l|. 



No. 294. Salenia bed ; Upper or Second Plateau, 800 feet above sea-level ; five 

 miles east-south-east of Lobito Bay. 



1. l.,30i; b., 28i; h., 23|. 



2. 1., 26^; b., 26; h., 20. 



3. 1., 31 ; b., 29; h., 24. 



No. 270. Three poorly preserved specimens ; top of Upper or Second Plateau, 

 850 feet above the sea-level ; above the Salenia bed ; five miles 

 east-south-east of Lobito. 



2. Holaster dombeensis, Lor. ; a broken specimen and a fragment from the 

 Inflata marls at Old Lobito agree in the characters available for comparison with 

 this species from the Inflata beds at Dombe Grande. 



3. Salenia domheensis, Lor., var. triangularis, n. var. Two worn specimens of 

 Salenia were found on the top of the Second Plateau at the height of 800 feet above 

 sea-level, five miles east-south-east of Lobito Bay. One specimen is fairly well 

 preserved, though the granules are only faintly indicated. It agrees very closely 

 with Salenia dombeensis of de Loriol,* which, however, occurs on a lower horizon. 

 According to de Loriol, that species is found at Dombe Grande in the mammillare 

 beds, which are Albian, whereas the Salenia bed near Lobito contained " S" inflata, 

 and a series of mollusca which Mr Newton has shown have Cenomanian and even 

 Turonian affinities. 



The epistroma of this Salenia is poorly preserved ; but sufficient patches of 

 o-ranules are recognisable to show that the arrangement is practically identical with 

 that of S. dombeensis. The Dombe Grande specimens are a little flatter : the dia- 

 meter recorded by de Loriol varies from 11 to 28 mm., and the height varies from 

 64 per cent, to 78 per cent, of the diameter ; in the specimen from near Lobito the 

 diameter is 19 mm., the height 15|, so that the height is nearly 82 per cent, of the 

 diameter. 



The apical disc lacks many of the slits shown in de Loriol's figure, but they are 

 very variable, and their presence is not regarded as of specific value. The only 

 definite difference which I can recognise is, that in the Lobito specimens the madre- 



* Op. cit., pp. 100-102, pi. vi, figs. 2-4. 



