Vol. 63.] 



AND COEALLIAN KOCKS OF BKILL. 



45 



second, a large species, is represented only by fragments, which fit 

 well on to the figure of A. monsbeliardensis, Contejean, in respect 

 of the closeness and curvature of the lines of growth. A third 

 (referred to as species B below) agrees in dimensions withal, pulla, 

 Eoemer, although the ornamentation does not seem quite the same. 

 The two remaining species (A & C) I have not been able to match 

 with any of the Upper Jurassic species, numerous though they be, 

 described and figured by various authors. They certainly cannot 

 be identified as Astarte supracorallina, d'Orb. 



The characters of these three species may be stated in tabular 

 form thus, measurements being in millimetres : — 





Species A. 



Species B. 



Species C. 





9-3 to 10 



8-9 to 9-5 



5-1 



•96 to -99 

 •55 



9 to 12 



7-5 to 8 

 7 to 7-5 

 4 to 4*6 ? 



•92 to -94 



•56? 



6-5 to 7 



10-4 to 11-7? 



102? to 11-2? 



5-6? to 6? 



•96? to -98? 

 •51 ? to -54 ? 



3 or 4 coarse 

 and 9 fine. 



Height 



Thickness 



Height 



Length 

 Thickness 



Length 



Number of concentric 1 

 ribs in a radius of 1 

 5 millimetres (where 1 

 farthest apart). J 



Lima semipunctata (?) Etallon. 



1859-61. Lima semipunctata, J. Thurmann & A. Etallon, ' Lethsea Bruntrutana ' 

 p. 244 & pi. xxxiii, fig. 7. 



The specimens of Lima in the serpulite-doggers of Brill are all 

 very small, the largest not exceeding 8 millimetres in greatest length. 

 They occur as internal casts, with only portions of the ears and 

 hinge-line persisting. There is, consequently, nothing but the shape 

 to identify them by, the casts being quite smooth. They agree in 

 shape with Lima semipunctata, Etallon, and may well be the young 

 of that species ; but might almost as well be the young of L. virgu- 

 lina, Thurmann. 



Ostbea cf. dtibiensis, Contejean. 



1859. Ostrea clubiensis, Ch. Contejean, ' Etude de l'Etage Kimmeridien dans les 

 environs de Montbeliard & dans le Jura ' pp. 320-21 & pi. xxi, figs. 4-11. 



The recognizable oyster-shells in the serpulite-doggers at Brill 

 (other than a single specimen of 0. dtltoidea, Sow.) resemble 

 Contejean's species in all respects except size, their dimensions 

 being about 50 per cent, greater. They cover much the same 

 varieties of form, and show similar ornamentation and similar 

 ligamental areas. 



This species has not been recorded from British strata. The 

 nearest hitherto-recorded British species is 0. Soiverbyi, Morris & 

 Lycett, from the Lower Oolites. From this species the present 



