1905 - 6 .] Echinorhynchus antarcticus and its Allies. 
441 
of spreading branches, between which run numerous connecting 
fibrils (fig. 6). The nerve ganglion, which is spindle-shaped, is 
situated at the base of the sheath. 
JUgg-spheres and Embryos. 
The egg-spheres (Iveimzellenballen, “swimming ovaries”) are 
very numerous. Ova of very various sizes were observed, and 
shelled embryos were present in very large numbers in all the 
females examined. It seemed useless to measure the ova; for 
although their size is usually recorded as of value as a specific char- 
acter, it was difficult to decide whether the ova under observation 
at a given time were mature. I give, however, the following : — 
Diameter of egg-sphere . . . -114 mm. 
Length of unshelled ova (largest noted) ’057 „ 
Length of fully-coated embryos . . T90 ,, 
Width of fully-coated embryos . . *04 ,, 
The embryos have a three-layered shell ; the outermost layer is 
thick and fibrillar, the middle one has a constriction at each end 
marking off a rounded knob-like portion. This layer is very 
dense. The last layer is comparatively thin. Upon none of the 
embryos were hooks observed (fig. 8). 
Testes. 
These are large, and consist of two pairs. The members of a 
pair are closely apposed to each other, but are easily separated 
by the dissecting needle, and further, are seen in sections to be 
quite distinct. They lie antero-posteriorly ; the anterior member 
is pear-shaped, the posterior is more ovoid. Attached to the 
anterior end of each pair is a soft spongy-looking gland, whose 
exact nature is undetermined. It has no connection with the 
cement glands, which lie posteriorly. 
Lemnisci. 
These consist of a pair of fairly broad bands, in which no canals 
could be observed. 
The present form appears to be new to science, and it has been 
