120 Actinopterygil — Lophohra^icJiii — Hemihranchii, i^r. 



Table-case, Acanus is an extinct genns, originally referred to the Berycida?, 

 No. 56. from the Eocene Slates of Canton Glaris, Switzerland. 



No. 56. 



liG. 104. — Siacrdia lainulaf, Ag. ; Eocene, Aixin Piovence, Fiance. 



SuB-ORDEu XIII. — Lophobranchii, 



These are a small sub-order of bony fishes having the gills 

 not laminated, but in the form of small rounded lobes or tufts. 

 The gill-cover is reduced to a large simple plate ; and the body 

 is moi-e or less encased in hard scales, arranged in segments. 

 Here are placed the " Pipe-6shes " and " Sea-horses," Avhich 

 Table-case, have bu.t few fossil repi'esentatives. An extinct species of 

 Siphonosfoma is exhibited from the Miocene of Licata, Sicily ; 

 and there is also an ancient type of " Sea-horse " — Calamostoma 

 —differing from the living Hippocampus in the possession of a 

 caudal fin, from the Eocene of Monte Bolca. Another " Pipe- 

 fish," Soleuorhynchus, has been found in the Eocene of Monte 

 Postale. 



Sub-order XIV. — Hemibranchii. 



The Fistulariidse, or " Flute-Mouths," avhich have been 

 aptly described as " gigantic marine sticklebacks," are first 

 known froin the Eocene formation. Fossil remains of the tAvo 

 living genera, Fistularia and Aulostmna, occur at Monte Bolca 

 and in the Slates of Canton Glaris ; and AuUscops, another 

 existing form, has been found at Padang, in the Tertiary 

 lignites of the Island of Sumatra. The Monte Bolca deposits 

 also yield two extinct genera, TJrosphen and Bhamphosus : the 

 latter has an immense spinous ray, denticulated behind, 

 inserted on the najDe, well shoAvn in the specimen in the case. 



Sub-order XV.— Plectognathi. 



The Plectognathi are remarkable for their dermal skeleton 

 and were originally placed by Agassiz among the " Ganoids " on 

 account of the characters of their armour. Some of these 



