Vol. 6$.-\ 



AND CORALLIAN ROCKS OF BRILL. 



43 



Cardioceras cordatum (Sow.) 

 Cardioceras vertebrate (Sow.) 

 Perisphinctes sp 



Alectryonia gregaria ? (Sow.) 



Area quadrisidcaia, Sow 



Area sp D 



Avicida inaquivalvis, Sow 



Avicula ovalis, Phill D 



Avicula sp D 



Exogyra nana, Sow D 



G oniomy u literata, Sow 



G-oniomya v-scripta, Sow j D 



Lucina crassa (?) Sow D 



? ' Mactromya brevis, Ag. 1 D 



Modiola bipartita, Sow ! D 



Modiola cuneata, Sow I ... 



Modiola imbricata, Sow 



Pecten fibrosus, Sow | D 



Pecten lens, Sow. ! D 



Pecten sp | D 



Pholadomya (squalls, Sow J D 



Pholadomya obsoleta, Phill ! 



Pholadomya sp ! 



Pinna lanceolata, Sow j D 



Pinna mitis, Phill i ... 



Pinna quadrata (1 Inoceramus) ; 



Pleuromya recurva (Phill.) j D 



Trigonia cla vellata (?J Sow ! D 



? Cyprina i D 



? Cardium i D 



? Ceromya ! "D 



IModiola D 



Thracia or Anatina x ; ... 



Serpula sp j D 



Bhaxella perforata ') Hinde (spicules)...) D 



1 These two are probably the same species. 



IY. Pal^ontological Notes. 

 Cyprina cyreniformis (?) Blake. 



1876. Cyprina cyreniformis, J. P. Blake, Quart. Jotirn. Geol. Soc. vol. xxxi, p. 227 & 

 pi. xii, fig. 6. 

 Compare also — 

 1866. Cyprina pulcliella, P. de Loviol, Mem. Soc. Phys. Hist. Nat. Geneve, vol.xix, 

 pp. 5-5-56 & pi. iv, figs. 10 a, 10 6, 11, 11a, 11 b. 

 Cyprina semiparvula, nomen nudum, Etallon, P. de Loriol, op. cit. p. 56. 



This little bivalve is very abundant in the serpulite-doggers at 

 Brill, just as Blake's species is at Woodhall Spa. It occurs in a 

 perfect state of preservation, with the valves tightly closed, or as 

 calcite- casts. Very rarely is a valve found single, and even then 

 the extreme toughness of the matrix makes the complete exposure 

 of the hinge-line impossible. 



It agrees well with Blake's description, but not with his 

 figure (an external view of the right side), which shows the umbo 

 as more anterior and the posterior part of the hinge-line as less 

 sloping. 



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