Yol. 54.] THE DECAPOD CRUSTACEA OF ENGLAND. 43 



authors respectively are copies of the woodcut accompanying M'Coy's 

 description, which is stated by the author to be diagrammatic only, 

 and not intended as an accurate representation of the specimen. 



Family Catometopa. 

 Genus Goniocypoda, Woodward. 

 GoNiocYPODA sulcata, sp. nov. (PI. II, fig. 10.) 



Description. — Carapace quadrate in outline, a fourth wider than 

 long ; slightly convex transversely, more so longitudinally. Orbito- 

 frontal border nearly straight ; width in proportion to that of the 

 carapace as 17 to 20 ; the median fifth occupied by the obtuse, 

 square rostrum. Portions of the elongated ophthalmic peduncles 

 are preserved. The antero-lateral borders bear the normal external 

 orbital, hepatic, and branchial processes. The postero - lateral 

 margin undulates inwardly and renders the posterior border 

 considerably narrower than the orbito-f rental. Dorsal surface^ 

 of carapace smooth ; the median are separated from the lateral 

 gastric lobes by an unusually wide, shallow sulcus, which extends 

 on each side from the base of the rostrum to the cervical sulcus ; 

 hepatic lobes large, but most of the normal dorsal lobes are 

 indistinctly defined. Cardiac region very wide, occupying fully 

 the median third of the scapular area. Sternum large, broadly 

 oval, five-sixths the width of the carapace ; the segments are 

 of nearly equal size. The abdomen in the male gently narrows 

 towards the telson ; the second, third, and fourth segments are 

 coalescent. Chelae of equal and moderate size ; hand scarcely half 

 the length of the carapace ; surface smooth. Fingers shorter than 

 the hand. 



Length of carapace = 16 mm. ; width=20 mm. 



Affinities.— I. refer this form to the genus Goniocypoda., established 

 by Dr. Woodward for the reception of a Tertiary species, G.Edwardsi, 

 Woodw. The carapace differs from that of its Eocene ally in both 

 form and size, being considerably larger, wider in proportion to the 

 length, and less acutely quadrangular ; also by the existence of 

 processes on the antero-lateral margin. The specific name refers to- 

 the strongly-marked sulcus which surrounds the mid-gastric lobes. 



Distribution. — Lower Greensand of Shanklin. The only specimen 

 that I have seen is in the Museum of Practical Geology ; it is a 

 male, and the chelae are of moderate size. 



EXPLANATION OF PLATES I & XL 



The figures are of the natural size, unless otherwise stated. 



Plate I. 



Fig. 1. Nephrops Reedi, sp. nov. Left chela. 1 a, palmar surface ; 1 b, dorsal 

 surface. Crag of Boyton, derived from the London Clay. York 

 Museum. 

 2. Gebia clypeatus, sp. nov. 2 a, dorsal surface of cephalothorax, X 2 ; 



