306 Dr. F. R G. Reed- 



given by Beushausen, but no internal view of G. rhenana is repre- 

 sented by this author. 



G. nassoviensis is stated to be distinguishable from G. rhenana 

 by its more obliquely elongated form and its higher and sharper 

 keel, and on the \vhole it seems that our shell is more probably 

 a member of the latter species. 



Dimensions. — Length of shell (oblique), 40 mm. Height at 

 anterior end 14 mm. Height at posterior end of hinge-line, 

 18 mm. Thickness, 14 mm. Length of hinge-line, 25 mm. 



Horizon. — Meadfoot Beds. 



Locality. — Kilraorie (S. 70). 

 Goniophora kilmoriensis sp, nov. Plate XII, Figs. 2, 2a, b. 



Diagnosis. — Shell narrow, much elongated, acutely pointed 

 behind, more than four times as long as high, slightly oblique, 

 subtriangular in cross-section, thickest towards middle narrowing 

 posteriorly and towards beak ; each valve divided into unequal 

 portions by a sharply angular gently arched longitudinal ridge running 

 obliquely across the surface from the beak to the j)osterior end and 

 having the areas above and below the ridge more or less flattened 

 and inclined to each other at 60-90 degrees. Beaks small, sub- 

 anterior, acute, pointed. Hinge-line nearly two-thirds the length 

 of the shell, making an angle of 15-20 degrees with the umbonal 

 ridge. Ligamental area well-defined, sunken, long, very narrow, 

 lanceolate. Left valve with strong rounded triangular anterior 

 tooth below the beak fitting into a corresponding socket in right 

 valve. Large anterior elongated oval muscle-scar, situated at front 

 end close to inferior margin, with a length equal to about one- 

 sixth that of the shell, deeply sunken, and marked off above by a 

 strong curved ridge ; pedal muscle-scar small, situated on its superior 

 anterior edge. Surface of valves ornamented with strong coarse 

 concentric strise, the portion below the umbonal ridge being crossed 

 anteriorly by sublamellose somewhat irregular but mostly equi- 

 distant thick lines making an angle of 45-60 degrees with the 

 umbonal ridge, the angle becoming smaller posteriorly till they are 

 parallel to inferior margin of shell ; the portion above the umbonal 

 ridge is crossed by similar but more regular and equal lines meeting 

 the ridge at a more acute angle (30-20 degrees) throughout the 

 length of the valve. 



Dimensions. — Length, c. 90 mm. Height (maximum), c. 22 mm. 

 Thickness (maximum), c. 20 mm. 



Horizon. — Meadfoot Beds. 



Locality. — Kilmorie (S. 68). 



Remarks. — The material from which the above description has 

 been drawn up consists of one internal cast of a complete shell, 

 which is perfect with the exception of the beaks and posterior end^ 

 and the external impression of the surface of the same individual. 

 It was collected by Professor Hughes' party at Kilmorie, Torquay, 

 in 1893. 



