PLATE XII. 



(Figs. 1 and 2 a are of the natural size ; figs. 2 b and 2 c are magnified.) 



Figs. 1. Ceratiocaris papilio, Salter. Carapace, showing the right valve, with 

 the abdomen and appendages shifted from behind to the front end, and turned 

 upside down. British Mus. (Page 37.) 



Figs. 2 a, 2 b, 2 c. G. stygia, Salter. A rather narrow example, perhaps a 

 variety, or modified by pressure. 2 a, carapace with right valve outwards, and 

 the abdomen and caudal appendages in place (a broken rostrum lies in front of 

 the carapace) ; 2 b, the striae converging at the postero-dorsal angles, enlarged 

 3 diam. ; 2 c, the portion of rostrum, enlarged 4 diam. British Mus. (Page 42.) 



