ICHTHYOLOGY CYCLOSTOMI. 115 



PLAGIOSTOMI. 



Matteucci has instituted new experiments on the Electric 

 Kay. (Annals, xi, p. 406 ; Comptes reiidus, xvi, p. 455 ; 

 Froriep's Notizen. xxv, p. 184.) 



In a short paper (Spicilegium Observationum anatomi- 

 carum de organo electrico in liaiis anelectricis et de Hsema- 

 tozois. Memoriam sacram regis augustissimi beati Frid. 

 Gulielmi III, indicit A. F. J. Carolus Mayer. Bonuse, 1843), 

 the author shows that even the non-electric Rays are pro- 

 vided with a rudimentary electric apparatus. As such he 

 regards a glandular organ scarcely the size of a hazel-nut, 

 occupying the same situation as that in which the electric 

 organ is placed in the electric Fish. He compares it with 

 the parotid. It was observed in Raja, clavata, batis and 

 Schultzii. (Vide also Froriep's Notizen, xxvii, p. 1.21. 



Humplireys Storer obtained at Cape Cod, and from New York, an electric 

 Fish, which he recognized as identical with Torpedo nollliana, Bonap. (Silli- 

 maii, Anier. Journ., Jau. 1843; Annals, xi, p. 326). 



ELEUTHEROBRANCHIL 



On the Structure of the Brain of the Sturgeon. A Paper 

 by Stannius. (Miiller's Archiv, 1843, p. 36.) 



CYCLOSTOMI. 



Petromyzon appendix, De Kay. Dorsal fins connected, yellow; anal fin with 

 a filamentous appendage in front ; 6 inch. Hudson. 



Ammoctetes unicolor, De Kay. Uniform colour, with a dorsal fin ; 5 inch. 

 Lake Champlain. 



Myxine australis, Jeuyns. Two branchial openings rather behind the fourth 

 part of the whole length ; a series of pores on each side of the abdomen ; 

 11^ inch. Tierra del Fuego. Is able to swim tail first. 



The Olfactory organ in Amphioxus has been discovered 

 by Kolliker. (Miiller's Arch. 1843, p. 32.) It is azygous, 

 and is a fresh indication that the animal occupies the lowest 

 place among the Cyclostomi. 



