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Nova Acta Academie Nature Curiosorum. 379 
the rudimental bones found in some Cephalopodous Mollusca. The 
details of the modifications observed in different fishes, which constitute 
the principal value of this paper, will not admit of a satisfactory analysis; 
we can therefore only indicate them as containing much interesting 
information for the comparative anatomist. They are partly original and 
partly selected from the works of previous writers on the Osteology of 
Fishes. ~ 
- Two species of 4uricula, Lam., found in turning over the plants collec- 
ted by him in the Island of O-Wahu, constitute the ‘Species Novas 
“* Conchyliorum Terrestrium, (quas) ex Insulis, Sandwich dictis, attulit 
** Adelbertus de Chamisso.’’ They are here described and figured as the 
Auricule O-waihiensis and sinistrorsa; and an indication is also given 
of a third, of which only a fragment was observed. 
. Dr. Otto’s ‘ Beschreibung einiger neuen, in den Jahren 1818 und 
“« 1819, in Mittellandischen Meere gefundener Crustaceen,’’ contains 
detailed. descriptions, accompanied by coloured figures, of nine new 
species of Crustacea from the Mediterranean Sea, These are referrible 
to the genera Portunus, Inachus, Alpheus (2 species), Callianassa, 
Praniza, Cymothoa and Caligus (2 species). The localities in which 
they were found are Nice and the Bay of Naples. 
The Memoir “ Ueber die Daphnia sima und ihren Blutkreislauf,” by 
Dr. Gruithuisen, is a valuable contribution to the anatomy of this singular 
genus. [In young individuals of Daphnia sima the valves are so transparent 
as to allow of the circulation of the blood being traced through the entire 
body with little difficulty ; and this circumstance has enabled the authour 
to givean outline of its course on the plate which accompanies his memoir. 
The following is the summary with which he concludes his more detailed 
account.  ** The veins descending from the arms, and ascending from 
“* the cheliferous tail and from the valves, pour the blood into the venous 
“* heart: the venous heart empties itself through a foramen into the 
** arterial heart; from which the great mass of blood is sent upwards to 
“ the arms, to the head and to the mantle, and downwards to the tail, 
** whence it returns by the veins, &c.’’. Both the arterial and venous 
hearts are stated to consist of sac-like muscular membranes, capable of 
quick and powerful contraction, especially the former, in which the 
vivacity of the pulsations has been noticed by several writers. Only 
