534 



MR. T. H. WITHERS ON 



Text-%. 65. 



Fif 



Fig. 

 Fig, 

 Fig. 

 Fig. 



Fig. 

 Fig. 



Fig 



6. Scalpellum arcuatmn Darwin, Nearly complete capitulum showing the 



left side uppermost, with the valves somewhat displaced and broken. X 2 

 diam, Albian, Gault: Folkestone, Kent. Brit. Mus. (Nat. Hist.), 1. 13577. 

 c, carina, showing the inflected intraparietes ; t.\, oviter portion of left 

 tergum ; t. 3, inner view of right tergum near apex, showing the ridges 

 evidently connected with the firm attachijient of the corium j s. 1, outer 

 portion of left scutum ; a. 2, inner view of right scutum showing the pit 

 for the adductor scutorum j I., upper latus j r.l,, rostral latus with ijpper 

 portion broken off; r-, rostrum. 



6 a. Id. Outer view of incomplete rostral latus, "^ 



6 6. Id, Inner view of same. | 



6 c. Id. Outer view of rostrum. V X 4 diftin. 



6 d. Id. Hypothetical transverse section of same. 



6 e. Id, Side view of same. J 



7. Restored capitulum of Scalpellum arcuatum Darwin. This figure is based 



on the neai-ly complete capitulum represented by flg. 6, with the addition 

 of a cai'inal latus and an infrajmedian latus. These two valves have not yet 

 been discovered in the Gault. X 2 diam, Albian, Gault : Folkestone, 

 Kent. C.I., carinal latus ; i.l., infra-median latus, 

 , 8, Scalpellum arcuatum Darwin. Two scales of the peduncle, a, outer view, 

 6, inner view ; c, outer view; c^, inner view. X 8 diam. Albian, Gnujt i 

 Folkestone, Kent, Brit, Mus. (N?it. Hist,), I, X3580, 



