On Goodsirea mirahilis. 
81 
nucleated cells, joined end to end in a single row, which por- 
tion terminated in a long ovate head, closely set with the 
large almond-shaped thread-cells, which were found on the 
tips of the larger tentacles. All these tubercles and their 
tentacles were destitute of ocelli. Eight otolitic sacs were 
attached to the exterior of the circular canal, each containing 
about four otolites. The sub-umbrella was formed bj four 
lateral canals, with their connecting membrane. Its upper 
part dipped downward so as to form a funnel, from the end 
of which the peduncle or alimentary polype was suspended. 
The peduncle, about an inch and a half in length, was very 
extensile, and of a greenish white colour. It was terminated 
by a quadrangular campanulate mouth. The peduncle in the 
female was rendered quadrangular by the four band-like 
ovaries, which passed along its whole length, and contained 
countless eggs. In the male it was cylindrical, and included 
a mass of spermatozoa between its ectodermal and endodermal 
layers. The whole of the lateral and circular canals were 
powdered, as it were, with dark purple pigment granules. 
When floating in the sea, or jerking itself along by the rapid 
strokes of its disk, this medusa was only rendered visible by 
the snake-like motions of its peduncle and tentacles. All the 
rest of its body was as transparent as glass. In a well-lighted 
jar of sea-water, the outer surface of the umbrella glowed 
with tints of blue, purple, and amber, reflected from the thin 
ectodermal membrane, which covered the gelatinous umbrella. 
With regard to this gelatinous structure, Dr Wright had 
come to the conclusion that it was not the homologue of the 
ectoderm of the polype, but rather a true corallum, homologous 
with the horny plate of Yelella and the corallum of Hydrac- 
tinia. Did it consist of ectoderm, it would be rendered opaque 
by alcohol, which was not the case, as might be seen in the 
specimen on the table. In captivity these animals floated near 
the bottom of the jar in which they were confined, supporting 
themselves on their tentacles and peduncle, with which they 
were constantly searching the bottom, as if for food. One of 
the females discharged a large number of ova, which were 
carefully preserved in a proper vivarium, and watched, but no 
farther development took place in them. Dr Wright had 
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