ACALEPH^. 
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Zoologists as Beroe ovatus, elongatus, Idya Forskalii, and Beroe 
Chiajii, very abundant at Nizza, and he declares them to be nothing 
else but different degrees of age of one and the same species, which, with- 
out farther discussing the synonymes, he comprehends under the name 
of Beroe ForsTcalii (Ann. d. Sc. Nat. t. 16, 1841, p. 193). In this Beroe, 
Milne Edwards remarked a red pear-shaped eye, which rested on a 
ganglion-like swelling, in a groove situated opposite the mouth, and 
contained several crystalline corpuscules. The cavity of the mouth of 
this Medusa stretches almost through the whole body, and passes at the 
base into a small cavity, surrounded by two padded lips, which may be 
compared to a stomach ; from this issue two vessels, which divide into 
eight principal trunks, and at the end of the mouth, discharge together 
into one circular vessel, on the way anastomosing with each other, by 
means of lateral branches. In this vascular system the nourishing fluid, 
which contains colourless round corpuscules, is put in motion by vibra- 
tory cilia. The cavity of the stomach discharges also externally, by 
means of two openings in the vicinity of the eye. 
Milne Edwards has described a new Beroid, found at Nizza, under 
the name of Lesueuria vitrea. It ranks very near the genus Mnemia 
of Eschscholtz, and the genus Alcinoe of Rang. Its wide-cleft mouth is 
covered with a multitude of contractile threads ; the cavity of the mouth 
reaches to the upper third of the oval and laterally compressed body ; 
in the upper half of this cavity two double-folded lamellae run along the 
walls, and may be considered as the ovarium. In the bottom of this 
cavity is found an opening, by which we arrive at the stomach, which is 
covered on its inner surface by a vibratory epithelium, and sends out 
four vessels, which pass through the body, and contain a colourless 
fluid, moved by vibratory cilia. In a groove found at the end of the 
posterior extremity of the body, is a red organ, similar to that which 
Milne Edwards found in Beroe. The same Naturalist discovered at 
Cetta a new discoid Medusa, which, as it stands very near the Aequorea 
forskalina and ciliatOj, has been called by him Aeq. violacea. Seventy- 
four canals pass from the very roomy stomach of this Medusa to the 
margin of the disc, where they unite into one circular vessel. The 
sexual parts form on the under surface of the disc folded lamellaa, which 
embrace the seventy-four radial vessels, and with their under margin 
float free in the water. He observed in these lamellae, in some indivi- 
duals, only eggs, in others spermatozoa. 
A new Medusa has been found by Forbes on the north coast of Ire- 
land, which belongs to the genus Hippocrene, characterized by Brandt 
(Ann. Nat. Hist. vii. p. 82). The Cytceis octopunctata, formerly described 
by Sars, Forbes has declared to be also a Hippocrene, the species of 
which he sums up as follows ; — II, Biigainvillii, Br. : stomachal appen- 
dages as long as the proboscis, eight, the four larger ones oblong, 
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