EASTMAN: FISHES FROM UPPER EOCENE OF MONTE BOLCA. 325 



1818. Centriscus aculeatus H. D. de Blainville, Nouv. Diet. d'Hist. Nat., Vol. 



XXVII, p. 339. 

 1835. Rhamphosus aculeatus L. Agassiz, Neues Jahrb., p. 291 (name only). 

 1839-42. Rhamphosus aculeatus L. Agassiz, Poiss., Foss. Vol. IV, p. 270, pi. XXXII, 



fig. 7. 

 1888. Rhamphosus aculeatus L. Vaillant, Exped. Scient. Travailleur et Talisman, 



Poissons, p. 339. 

 1898. Rhamphosus aculeatus F. Bassani, Palsentogr. Italica, Vol. Ill, p. 82; pi. IX, 



fig. 4. 

 1901. Rhamphosus aculeatus A. S. Woodward, Cat. Foss. Fishes Brit. Mus., Part 



IV, p. 378. 

 1905. Rhamphosus rastnun C. R. Eastman, Mem. Soc. Geol. France, No. 34, p. 20. 

 1911. Rhamphosus aculeatus C. R. Eastman, Mem. Car. Mus., Vol. IV, No. 7, p. 362. 

 Type. — Nearly complete skeleton; Paris Museum of Natural Histor3\ 

 The genotype, which attains a length of about 14 cm. Maximum depth of 

 body occurring in about the region of the pectoral arch, behind which the trunk is 

 slender and gradually tapering. Distance between the orbit and extremity of the 

 elongated rostrum equal to that between the orbit and origin of the second dorsal 

 fin, and equalling also the length of the single dorsal spine. The latter is slender, 

 acuminate, nearly rectilinear, and posteriorly denticulated. The beak also bears 

 a series of minute denticles. Dorsal and anal fins equal and directly opposed, 

 each with nine rays, and caudal with sixteen rays. Scales very minute, having 

 the form of dermal granulations or papillae. 



This is an extremely rare form, only two examples being found in the Paris 

 Museum and a small imperfect one in the British Museum. One fully grown and 

 three immature individuals are contained in the collection of the Carnegie Museum, 

 being cataloged as follows: 5328, 5310 + 5310a, 5312, and 4213 + 4213a. Two 

 of these are figured in the accompanying plates. 



Family UrdsPhenid^ Gill. 

 Solenichthyes with the first four vertebrae" much elongate, a moderately 

 elongated and slender body, a long tubiform snou't with terminal mouth, second 

 dorsal and anal remote, similar and opposite, caudal fin relatively large, vertebra? 

 between fifty and sixty in number; scales absent. 



Genus Urosphen Agassiz. 

 No new characters can be added to the generic diagnosis of this genus, but a 

 further study of one nearly complete skeleton in the collection warrants the estab- 

 lishment of a new species, the description of which immediately follows. 



