314 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
growth of the gonophores in this position is due to the change in posi- 
tion of the support of that particular part, the whole growth of these 
must have taken place after the colonies had been torn away. 
Another instance is here exhibited of the ready interchange of the 
various parts of the colony and, here as well as in Clytia cylindrica, 
of considerable power of adaptability to varying conditions. 
MEDUSAE, SIPHONOPHORES, CTENOPHORES. 
The identifications in the table (p. 316-317) require explanation. 
All with broad stomach, smooth subumbrella and considerable 
numbers of tentacles and canals are classed here as Ae. aequorea. 
Aequorea groenlandica Péron et Lesueur. I follow Mayer (1910, p. 
Fic. 78.— Obelia geniculata. 
335) in identifying as a southern race of Ae. groenlandica the large 
aequorid, with stiff gelatinous substance, and numerous subumbral 
gelatinous papillae radially arranged, which is common off the coast 
of New Jersey in summer and autumn. The southern race has been 
recorded so seldom that a few counts of the radial organs are given:— 
Station Diam. Tentacles Canals 
mm. | 
10069 100 110 89, all with gonads 
10075 iD rai 96, 3 branched 
“ vo 68 88, 1 ‘ 
s 70 61 106, all simple 
= 50 50 85, all simple 
Aglantha digitale Fabricius. The status of the two forms of Aglan-_ 
¢. 00 ” 
tha, so often recorded from northern waters as “rosea’’ and “ digitale, 
