MODIFICATION OF THE EYE PEDUNCLES IN CYMONOMUS. 455 



corneal surface is no longer distinct as in 0. granulatus, 

 and numerous spinules are grouped in a row on the internal 

 border of the peduncles.^ 



5. The second joint of the antennary peduncles, instead of 

 being delicate and almost smooth as we see in C. granulatus, 

 is much larger than the others, and possesses spines on its 

 external border." 



6. The notch of the palatine border is less extensive than 

 in C. granulatus, so that the two halves of the border pass 

 considerably to the inner side of the urinary tubercle. On 

 the contrary, the palatine surface is complete in C. grann- 

 latus, whilst presenting on each side a small antero-posterior 

 crest. 



7. The base of the exopodite of the first and second, 

 maxillipedes advances less in front than in C. grannlatus 

 [quadratus in original — E. R. L.]. 



8. The last abdominal segment of the female has regularly 

 rounded-off side borders in C. grannlatus; whilst in 0. 

 quadratus, on the contrary, the border on each side forms 

 an inwardly convex curvature. 



Distribution. — C. quadratus represents in the Carib- 

 bean region the 0. granulatus of the Mediterranean and 

 North Atlantic. 



Species 2. — C. granulatus, Norman. 'Brit. Assoc. Reports' 

 (as Etliusa granulata), 187o. 



In addition to the definite points of difference between this 

 species and C. quadratus quoted above from M. M.- 

 Edwards and Bonvier may be mentioned the generally more 

 granular condition of the surface, and the tendency to an 



' See our text block, Fig. 10, e, and compare willi Pis. 33 and 31. 



2 See PI. 34, fig. 12. The joint referred to is wliat appears in the drawing 

 as the first or proximal, the true first being fused with and hidden beneath 

 the carapace. The observation as to tlie difference of the spinulation of 

 this joint in C. granulatus and C. quadratus is confirmed by the exa- 

 mination of our specimens in the Nat. Hist. Mus. But C. Normani has as 

 spinose a margin to the joint as C. quadratus, and has the next joint also 

 spiniferous, although it is quite smooth in C. granulatus (see p. 457). 



