108 Mr. P. Schmidt on a new 



M la at the level of the seventh postnodal in the fore wings, 

 and the last postnodal in the hind wings. Venation other- 

 wise like that of A. cyane. 



Abdomen : ground-colour of proximal half greenish blue, 

 of distal half greenish brown ; bronze-black markings on 

 dorsum ; segments 1 to 4 marked as in male ; markings on 

 5 to 7 also as in, male, but somewhat larger, and exposing less 

 of the ground-colour ; 8, 9, and 10 mostly, but not entirely, 

 covered with bronze-black ; 10 with the hind margin con- 

 spicuously notched in the mid-dorsal line. Anal appendages 

 short, subcorneal, blackish. Ovipositor greenish brown, 

 reaching to end of abdomen ; palps projecting beyond end of 

 abdomen, blackish, slightly recurved. 



The types have been deposited in the British Museum 

 (Natural History). 



XVI. — On a neic Flat-fish of the Genus Arnoglossus from 

 the Black Sea. By Peter Schmidt, Curator of the 

 Ichthyological Department of the Zoological Museum of 

 the Imperial Academy of Sciences in Petrograd. 



If we omit doubtful species, there are only three flat-fishes 

 (Heterosomata) known from the Black Sea : — 



(1) Rhombus mceoticus, Pall. 



(2) Pleuronectes fiesus, L. 



(3) Solea nasuta, Pall. 



It is therefore, perhaps, of some general interest that in 

 the collections of the Zoological Museum of the Imperial 

 Academy of Sciences in Petrograd I found a fourth and very 

 interesting new species belonging to the genus Arnoglossus. 

 In memory of the late eminent Russian ichthyologist 

 Prof. K. F. Kessler, I have named this species Arnoglossus 

 kessleri. 



Arnoglossus kessleri, sp. n. 



D. 74-76. A. 53-57. P. 9-11. V. 6. C. 17. 

 L. 1. 38. Vert. 33. 



Eyes on the left side. Body oval, with very short caudal 

 peduncle. The height of the body is 38 °/ of the total 

 length, the length of the head 21 %• Tlie length of the 

 caudal peduncle (without the part of the caudal fin covered 

 with scales) is | of its least height. The mouth is very 



