OnTIlRAGORISCUS. 129 



So we see that either there may be 1°. O.-species with- 

 out any osseous tubercle permanent through life '), 2°. 0.- 

 species with a tubercle only on the snout, 3°. O.-species 

 with tubercles on snout and throat, or the tubercles are 

 permanent or not without being a specific character. 



Only a long series of specimens of the most different 

 sizes, together with other characteristics, shall show 

 whether the presence of tubercles is of specific-value or 

 not. An other young specimen ^) , which Prof, Hubrecht 

 was kind enough to sent me, measuring about 4 cM. , 

 shows the same number of osseous tubercles. 



The » folded band" between dorsal-, caudal-and analfin 

 and the body, to which Dr. v. L. de Jeude refers in » Notes 

 »from the Leydeu Museum, Vol. XII, p. 191 and Vol. 

 »XIV, p. 128", is present in both young animals. I will 

 mention here the great resemblance between Yarrels figure 

 in ^British Fishes, .3d Ed., Vol. 11, p. 432" and that of 

 0. nasus in »N. f. t. L. M., Vol. XIV, pi. 5" (made after 

 a photo of the fresh animal) , especially concerning the 

 produced snout and the folds in the skin of the body. 

 The band between fins and body is in Y's figure very 

 distinct, in the photo we can only see a demarcation-line, 

 the skin of the band having nearly the same consistence 

 as that of the body, though folds parallel to the line exist. 

 Yarrel says (Vol. II, p. 435): »the representation is from 

 »an adult fish, which was cast ashore at Scarborough and 

 »is preserved in the Museum there. It measured, from the 

 » point of the nose to the end of the caudal fin, three 

 »feet five inches (±104cM.)"; so this specimen has about 

 the same size as our 0. nasus from Callantsoog (123 cM.). 



It seems to me that Y's drawing is an exact one ^) ; 



1) See also the drawing in „Yarrel, British Fishes, Si Ed. Vol. 11, p. 436" 

 after a young specimen (35| cM.), and that in ./Day, Brit. Fishes, pi. 148" 

 after an adult one (drl54cM.). 



2) See also: „Notes f. t. L. Museum, Vol. XII, p. 194." 



3) Yarrel says about this and another specimen: «the attachment of each fin 

 «was thick and fleshy." 



JS^otes from the Leyden IMuseum, Vol. XVI. 



