54 p. H. CAKPENTER OK C0MATULJ3 PROM 



7. Antedon peisca, n. sp. Plate Y. fig. 7. 



Besides the isolated centrodorsal just described {Act. ahnormis), a 

 second specimen from the same locality, but with the radials attached, 

 was forwarded to me by Dr. Wright; but, to my great regret, it arrived 

 in a most fragmentary condition. The centrodorsal was in several 

 pieces, one or two fortunately being rather large ; while the radials 

 were all separated from one another, and one of them broken in two. 

 These, however, I have succeeded in fitting together sufficiently well 

 to be able to see their general characters. Between the lower angles 

 of the contiguous radials there appear externally the rounded ends 

 of small basal rods, just as in the species of Solanocrinus from the 

 White Jura of Germany and Ant, cequimarginata (PI. Y. fig. 4, c). 

 These are possibly the ends of basal rays just as in recent Comatulce ; 

 but owing to the condition of the specimen it is impossible to make 

 out whether their central ends were connected with a rosette as in 

 the living species. 



The greater part of the dorsal surface of the radials is synosteal 

 for their attachment to the centrodorsal, only a small peripheral por- 

 tion being turned upwards so as to appear on the exterior of the 

 calyx, where it would be barely visible except just at the angles. 

 There is thus considerably less of an " outer dorsal surface " than in 

 S. costatus, which this type resembles in most other points, viz. the 

 basal pieces appearing externally, the slope of the outer faces of the 

 radials and their shape, wide and low with large ligamentous and 

 small muscular fossae, which are separated by a slight furrow. The 

 latter features are usually characteristic of Actinometra, but they 

 also occur in Ant. macrocnema and Ant. hrasiliensis, and are accompa- 

 nied, as in this fossil, by a greater slope of the distal faces of the radials 

 than I know of in any Actinometra. I have carefully compared the 

 radials of this fossil with those of eleven recent species of Actinome- 

 tra ; but they have a much less resemblance to any of these than to 

 the radials of Ant. hrasiliensis, the distal faces of which are also con- 

 siderably inclined to the vertical axis of the cal3^x. The large size 

 of the transverse articular ridge and the number of cirrhus-sockets 

 on the larger fragments of the broken centrodorsal piece also point 

 to this fossil being an Anteclon. Except for having a notch in the 

 middle of their upper border and an intermuscular furrow descending 

 from it, the wide and low distal faces have a general resemblance to 

 those of Ant. cequimarginata (PI. Y. fig. 4, b, c). 



Width of a single radial 3 millims. 



Locality. The Bradford Clay, Cirencester. 



Pound by Dr. S. P. Woodward; now in the collection of Dr. 

 Wright. 



This is the oldest known Antedon, no species of Solanocrinus occur- 

 ring in Germany below the lowest beds (a) of the White Jura, which 

 correspond to our Middle Oolites. 



8. AcTiNOMETEA MtJLLEEi, u. sp. Plate Y. fig. 6. 

 Centrodorsal a thin pentagonal disk with from 2-4 sockets along 



