14 ARKIV FÖR ZOOLOGI. BAND 10. NIO 8. 



Vomer is small, with articular surfaces for the praemaxil- 

 laries and the palatines. It is wedged in between the lamina 

 of parasphenoideum. 



Paras phenoideum is very large and strongly compressed. 

 HoLLARD considers this bone to be divided by a suture in 

 two portions, one anterior and one posterior; but what he 

 took for a suture is only a rugosity of the surface. 



Basisphenoideum. As Supino has shown, this bone is 

 paired. Klein denies the presence of the basisphenoidea, 

 and remarks this as a peculiarity, because a canal for the 

 eyemuscles is to be found. What he calls processes of pro- 

 oticum, however, is the basisphenoid. 



Alisphenoideum is small. 



8quamosum is vertical. One of the upper supracleithrals, 

 which is not forked, lies, firmly wedged in, in a furrow of 

 the squamosum. 



Nasals and suborhitals are absent. 



Palatinum, is very small and T-shaped. It articulates 

 with the lateral ethmoid and the maxillary. 



Ectopterygoideum, entopterygoideum, meiapterygoideum and 

 quadratum are present and do not show any peculiarities. 



PraemaxtUare. The two bones have not coalesced with 

 each other, as Hollard states, but are rather firmly united. 



Maxillare is rather firmly united to, but not coalesced 

 with, the praemaxillary. It lies behind the praemaxillary. 



Dentale consists of two distinct paired pieces. 



Articidare and angidare are distinct. 



Praeoperculum, operculum, suhoperculum and interoperculum 

 are distinct. Interoperculum forms a part of a ligament run- 

 ning from the opercle and subopercle to the mandibular. 

 All the opercular bones are rather small. 



Hyomandihulare and symplecticum do not reach each other. 

 Symplecticum is wedged in between the two posterior pro- 

 cesses of quadratum. 



Styloideum is attached to metapterygoideum. Hollard 

 states that the hyal arch is made up, in addition to hyoman- 

 dihulare, of only three pieces not five, as is the general 

 number in the teleosts; but this is a mistake. As SuriNO has 

 shown five pieces can be distinguished. 



Praemaxillare and dentale bear teeih. 



As to the conjiguration of the skull, the mest pregnant 



