BARBADOS-ANTIGUA REPORTS 17 



same length, but composed of about half as 

 many much longer segments, and much less 

 flexible 



Coccometra 



h2 most or all of the segments of the first pin- 

 nule longer than broad 



ii proximal pinnules all of the same char- 

 acter; first pinnule shorter than the sec- 

 ond, which is shorter than the third 

 ji each brachial has the midline of the 

 dorsal surface raised into a high 

 prominent keel; the division series 

 and first two brachials are very 

 broad, in close lateral contact with 

 their neighbors, and only slightly 

 convex dorsally; the genital pinnules 

 are very long, the longest pinnules 

 on the arm; the centrodorsal is very 

 large, columnar or broad truncated 

 conical; the cirri are short and stout, 

 without dorsal processes; the general 

 habitus is stout 



Tropiometra 



j2 the dorsal surface of the brachials is 

 unmodified, but their distal edges are 

 produced in a frill of long spines; 

 the division series and lower brachials 

 are narrow and well rounded dorsal- 

 ly; the genital pinnules are shorter 

 than the proximal or distal pinnules, 

 which are of the same length; all the 

 pinnules are very slender and stiff, 

 especially the lower, which are thorn- 

 like, the component segments with 

 numerous long spines on their distal 

 ends 



Hybometra 



i2 first pinnule markedly longer than the 



second and following 



ji first pinnule very stout, and so large 

 at the base as to give the second 

 brachial the appearance of an axil- 

 lary; edges of the elements of the 

 division series armed with coarse 



