160 ODONTOLABIS LOWEI. 



The forma teledonta of 0. Sommeri Parry remained also 

 unknown to Dr. Leuthner. As could be expected from 

 analogy of the other forms, the teledont mandibles of 

 Sommeri prove to be much like those of Brookeanus , the 

 principal difference being the want of the large basal tooth 

 and the presence of small granular teeth below the me- 

 dian fork. My two specimens are of different development 

 and the individual with the longest mandibles is very re- 

 markable for its having a head with a little crest, of this 

 no parallel form of Brookeanus is known as yet. 



Description of the forma teledonta. 



Mandibles longer than the head , strongly sickle-shaped, 

 slender and flattened , ending in a single apical spine, which 

 is followed by a fork on the innerside (the fork of Broo- 

 keanus more strongly developed) , along the under margin 

 below the fork and in connection with it with from three 

 to five irregular large granules or small teeth and a single 

 granule on the uppersurface just at the base. Head with 

 the anterior margin emarginate in front or slightly pro- 

 duced in the middle in a gently curved line, forming a 

 little crest , and with a broad epistoma-like clypeus, broader 

 than that of Brookeanus. 



JN^otes froxa the Ljeyden ]>Jluseiim, Vol XII 



