536 Mr. '1\ H. Withers on a 



vhicli occur in the hand from wliich the cruh-remains were 

 obtained include : — 



Badiolites caJicellains, Whitfield. 



Jjijiloria crassolaiuellosa, Edwards & Hainie. 



HtUaf^trea ci/athiforiiii'--, Duncan. 



exaculpta, iieuss. 



Actieoi.ella sp. 



The bank is largely composed of Eadiolitea cancellatvs, 

 and it is lioped to describe the fauna from this bed more fully 

 lakr. 



Collection. — Collected by Dr. D. Woolacott, and presented 

 by him to tiie Geological Department of the British Museum 

 (registered In. 20780-ln. 20782). 



Material. — Tiiiee specimens — holotype, In. 20780, an 

 almost c(mplete male shell with the tour an>buiatory ap- 

 jjendages preserved on the left side ; In. 20781, another male 

 carapace with the right minor chela the only one of the 

 appendages preserved; In. 20782, a left major chela. 



Description. — Carapace rectangular; in specimen In. 20781, 

 lengtii 33*4: mm., breadth 35*8 mm. ; in In. 20780, length 

 34:"1 mm., breadth 38"8 mm. Anterior margin generally 

 straight and long, the front and the outer orbital spines 

 j)roniinent, although the front is slightly more forward. 



The front is divided into three lobes, the median of which 

 is small, longitudinally oval, and separated by deep channels 

 from the other two ; from these lobes the front is sharply 

 dedected slightly inwards and downwards to form a some- 

 what concave shovel-like extension. 



On either side of the front the orbital region is marked 

 off into three wide lobes or teeth. The first of these, counting 

 from the front, is the widest ; it is concave from the front 

 and becomes convex where it is folded sliglitly below the 

 next lobe, which is smaller and markedly convex ; there is 

 only a slight notch dividing this second lobe from the third 

 small and rounded lobe ; this is followed by a deep notch, 

 and then a small tooth which forms part of the much larger 

 outer orbital tooth marking the outer limit of the orbital 

 region. 



The lateral margins are almost straight and converge only 

 very slightly towards the posterior margin ; they are some- 

 what rounded at the jtostero-lateral angle and merge into the 

 posterior margin, which is only slightly concave in tlie 

 middle. 'i'here is a short sharp spine or tooth on eacii 



