52 



J. R. KiNAHAN on the Britannic Species of 



The carapace is produced between the orbits as a tooth flattened vertically, 

 constituting a rostrum. 



Ma4 



A-/V,A /JU, ,ov^ t^nj\ aJIa ^-Hv^ 



1800 



Plate I. 



DIAGRAMMATIC SKETCH, ILLUSTRATING HOMOLOGIES OF CEANG0NID7E. 



A, Abdomen. The numerala refer to the somites, and their respective appendages, the coxte are represented as attached 

 to the somites. 



K fl, Cephalothorax and its appendages. 



M d 4, Lateral view of carapace ; g, gastric region ; cd, cardiac do ; h, hepatic do. ; 6r, branchial ; 1, first, or ocular seg- 

 ment; 3, olfactory antennal do. ; 2, auditory antenna : 4, mandible. 



mi". Back view of carapace ; /, frontal region. The other references as Md4. 



Q, Somites of mouth organs and their appendages. 



R, Do. of ambulation ; 10, 11, 12, first, second, and third chelipeds; those of 13-15 resemble 12; ex, coxa; 6, basis- 

 1, ischium ; m, meros ; c, carpus ; p, propodos ; (/, dactylas. 



I. Outline rostrum, C. vulgaris. — IT. Cli. spinostis. — III. Ch. bispinosus IV. M. fasciatus. — V. yE. sculptus VI 



Ch. cataphraotus. 



