118 Prof. F. M'Coy on some new Cretaceous Crustacea. 



Glyphaa cretacea (M'Coy). PI. IV. fig. 2. 



Desc. Carapace narrow ; cephalic portion long ; from nuchal fur- 

 row to anterior end of inner tuberculated cephalic ridge ex- 

 ceeding the greatest depth of the carapace, and exceeding the 

 length of the triangle enclosed between the nuchal furrow 

 and the posterior converging extremities of the oblique bran- 

 chial ridges ; space below the outer cephalic ridge on each 

 side and the branchial regions covered with a rather coarse, 

 etmal granulation (averaging eight to nine granules in 2 

 lines). Length from anterior end of inner cephalic ridges to 

 posterior end of carapace on dorsal mid-line, slightly more 

 than 10 lines ; from middle of nuchal furrow to same point 

 slightly more than 9 lines ; greatest depth at middle of cara- 

 pace 4 lines. 



I do not know any possible modification of Milne-Edwards' s 

 nomenclature of the parts of Crustacea, which would enable us 

 to describe the ridges and sulci of the branchial region of a Gly- 

 phcea in terms indicating any homology with corresponding parts 

 in other Decapoda. This is of little importance, however, in the 

 description of the species, as the ridges are similar in all the 

 examples of the genus. I am not aware of any other true 

 Glyphaa in the cretaceous rocks. This very rare species is ex- 

 tremely like the Glyphaa rostrata (Phill. sp.) of the coral rag on 

 a small scale, but is easily distinguished, besides its smaller size, 

 by the much greater proportional length of the cephalic part of 

 the carapace, or that in front of the nuchal furrow, when com- 

 pared with the portion behind it. 



Very rare in the Upper greensand of Cambridge. 



[Coll. University of Cambridge.) 



Notopocorystes (M'Coy). 



The judicious researches of Mr. Carter of Cambridge have 

 enabled him to add to the characters I originally published of 

 this genus in the ' Annals/ that there is a notch also in the 

 lower edge of the orbit. 



I have detected a specimen in his collection of the common 

 N. Mantelli (M'Coy) with a pea-like swelling on one of the 

 branchial regions on the back of the carapace, indicating no 

 doubt the existence during the cretaceous period of a repre- 

 sentative of the internal parasitic genus Bophyrus, which attaches 

 itself to the internal gills of many Crustacea at the present day, 

 manifesting its presence by the like external symptom. 



Notopocorystes Carlcri (M'Coy). PI. IV. fig. 3. 

 Desc. Carapace elongate, trapezoidal ; greatest width (a little 



