618 Mr. R. Kirkpatrick on 
The four main canals are very narrow at first, and increase 
slightly in calibre as they proceed. ‘l'hey open into the apices 
of the four radial angles of the loops of the circular canal. 
(c) The circular canal presents eight loops, corresponding 
with the eight lobes of the umbrella. 
(d) The centripetal canals. Four main centripetal canals 
arise from the interradial angles of the circular canal and 
branch at acute angles; they occupy the lower fourth of 
the interradial region ; the branches end blindly. A few 
adradial twigs and diverticula are given off from the circular 
canal on each side of the main radial and centripetal adradial 
canals. The central region of the loops is without centripetal 
canals. 
A finities. 
The position of Gonomeandrus is near Polyorchis, Agassiz. 
I had at first thought that the specimen belonged to the 
Anthomeduse, because the peduncle was so covered with the 
folds of the gonads as to conceal its true nature, and I have 
to thank Mr. E. T. Browne for pointing out to me that this 
structure was simply a solid gastric peduncle; and when I 
found that the transverse ridges in the stomach-wall were 
simply folds, and. that no gonads were present in that situa- 
tion, it became clear tliat the specimen belonged to the Lepto- 
meduse. Gonomeandrus is distinguished from Polyorchis by 
its possessing transversely-folded gonadial lamella in place of 
pendent filaments, and in having narrow branching secondary 
canals in place of broad diverticula or simple branches given 
off from the radial canals. 
It is worthy of note that one species of Polyorchis possesses 
arudimentary gastric peduncle. In the figure of the specimen 
of Polyorchis penicillata, A. Agassiz, given by Fewkes (2. 
p- 094, pl. xxii. fig. 3), this organ is shown with gonads 
dependent from it. Fewkes writes :—‘‘'The ovaries hang 
from the upper portion of the manubrium from a gelatinous 
elevation or extension of the bell which bears the proboscis.” 
He here considers the presence of ocelli and absence of otocysts 
of more importance than the position of the gonads, and places 
the genus in the Anthomeduse. 
TRACHOMEDUS&. 
Gontonemus Agassizit, Murbach and Shearer (8. p. 185, 
pl. xxi. figs. 1, 2,3). (Pl. XX XIII. figs. 5, 6.) 
There are six specimens in varying stages of growth, from 
Naba Bay. The specimens become relatively much flatter 
as they increase in size, the smallest being 5x5 millim, in 
breadth and height and the largest 21x9 millim. (The 
