ORTHRAGORISCUS NASUS. 211 



is all over covered with similar little pricks as the skin of 

 the body. It has two branches in the tail , one between 

 the 4th and b^^ lobe, the other, which is the largest, be- 

 tween the 7'^ and S^^. 



The above mentioned characteristics of the snout, of the 

 swell above the eye and the pectoral fin, and of the ho- 

 rizontal folds on the body plead in favour of the meaning 

 of Dr. van Lidth de Jeude, that 0. mola and 0. nasus must 

 be regarded as two distinct species. 



As no osseous tubercles are found on the body besides 

 that on the snout, I think that their presence on other 

 parts of the body can not be regarded as a specific cha- 

 racter (see Notes Leyd. Mus., Vol. XVI, p. 129). 



The genital organs were undeveloped. In preparing the fish 

 for stuffing an opening was found just behind the anus, 

 which was not found in the specimens from Ameland and 

 Callantsoog (both males). 



However such an opening is described by Harting (see 

 p. 26 of his memoir „Notices zoologiques, anatomiques 

 et histologiques sur VO. ozodura') as the end of the ovi- 

 duct, and so I believe our specimen to be a female (see 

 also the drawing after Cleland in Smith „Skandinavian 

 fishes" T. II, p. 628). 



On the skin and the gills , as well as in the intestines , 

 were found many parasites, which, according to Dr. Horst, 

 belong to the following species: 



1°. on the skin 



X. Tristoma molae Blanch., 2 ex. Found also on the 

 skin of our 0. mola from Ameland. 



/3. Laemargus muricatus Kr., 23 ex. (13 (ƒ, 10 9)- Not 

 found on our 0. mola nor on our 0. nasus hova. 

 Callantsoog. Some of these parasites had made 

 holes of 1 cM. diam., and nearly 2 cM. deep. One 

 lobe of the tail was partly destroyed by them. 



•y, A species nearly allied to L. muricatus. ^oiioMudi 

 on our former specimens of Orthragoriscus. 



Notes from tbe Leyden IVIuseutn, "Vol. XV III. 



