204 
PROCEEDINGS OF SOCIETIES. 
“Although. I have not had an opportunity of dissecting a typical 
species of the genus Cuma, I do not hesitate to group the present species, 
and probably C. JEdwardsii, as distinct from Cuma, since Goodsir asserts 
that both antennae are present in those Cumae which he examined, the 
upper in a rudimentary state, a character which I cannot find in V. cris- 
tata; this, taken with the altered condition of the pereion, justifies the 
presumption of a generic distinction. 
“ In selecting a name, I have fixed on that of the discoverer, being 
one which is familiar to every carcinologist, and to which honour is due 
for valuable discoveries in this department of zoology. More than one 
of the name having been eminent as a naturalist, a license has been 
taken,—the Christian name has been incorporated with the surname, 
and both spelled according to sound: the word is thus both shortened 
and rendered more easy for pronunciation by foreigners. 
“ Cyrianassa longicornis (J. V. Thompson , MSS. sp.). 
“ Pleopodis, paribus primo et sexto exceptis, nullis. Ceteris ut Cyr. 
gracilis. 
“hTo pleopoda developed on the second, third, fourth, and fifth seg¬ 
ments ; the other characters as C. gracilis. 
“ All the appendages of the pleon are suppressed, except the first and 
sixth pairs ; telson squamiform and rudimentary. 
“ Length, *15 inch. 
“ In the higher forms of Crustacea the pleopoda in the male are often 
altered in form, and sometimes even wanting, except when they are 
subservient to the sexual character. It may be, therefore, that the dif¬ 
ference between the present species and C. gracilis is one of sex only. 
“ A single specimen in the Loyal Dublin Society’s collection is the 
only one I have seen. 
