ICHTHYOLOGY-CYCLOSTOMI.
115
PLAGIOSTOMI.
Matteucci has instituted new experiments on the ElectricRay. (Annals, xi, p. 406; Comptes rendus, xvi, p. 455;Froriep’s Notizen xxv, p. 184.)
In a short paper (Spicilegium Observationum anatomi-carum de organo electrico in Raiis anelectricis et de Ilsema-tozois. Memoriam sacram regis augustissimi beati Frid.Gulielmi III, indicit A. F. J. Carolus Mayer. Bonn ®, 1843),the author shows that even the non-electric Rays are pro-vided with a rudimentary electric apparatus. As such heregards a glandular organ scarcely the size of a hazel-nut,occupying the same situation as that in which the electricorgan is placed in the electric Fish. He compares it withthe parotid. It was observed in Raja clavata , batis andSchultzii, (Vide also Froriep’s Notizen, xxvii, p. 121.
Humphreys Storer obtained at Cape Cod , and from New York , an electricFish, which he recognized as identical with Torpedo nobiliana, Bonap. (Silli-man, Amer. Journ., Jan. 1843; Annals, xi, p. 326).
ELEUTHEROBRANCHII.
On the Structure of the Brain of the Sturgeon . A Paperby Stannius. (Muller’s Archiv , 1843, p. 36.)
Petromyzon appendix, De Kay. Dorsal fins connected, yellow; anal fin witha filamentous appendage in front; 6 inch. Hudson.
Ammocates unicolor, De Kay. Uniform colour, with a dorsal fin; 5 inch.Lake Champlain .
Myxine australis, Jenyns. Two branchial openings rather behind the fourthpart of the whole length; a series of pores on each side of the abdomen;111 inch. Tierra del Fuego. Is able to swim tail first.
The Olfactory organ in Amphioxus has been discoveredby Kolliker . (Muller’s Arch. 1843, p. 32.) It is azygous,and is a fresh indication that the animal occupies the lowestplace among the Cyclostomi ,