100 MR. G. A. BOULBISTGER ON THE ArHIOATS" AND [Eeb. 7, 



Alveolar surface of jaws narrow, with two series of 



notched teeth ; a pair of enlarged, incisor-like 



teeth at the symphysis ; an adipose crest on the 



occiput 15. Steatocranus Blgr. 



Alveolar surface of jaws very broad ; outer teeth 



large, with nail-shaped entire crowns, those of the 



inner rows tricuspid 16. Bocimodns'Sigv. 



E. Anal spines III ; teeth large, few, in a 

 single series. 

 Teeth with swollen bases and low, compressed, 



slightly notched crowns , 17. Perissodus'Sigv. 



Teeth compi-essed and truncate, curved and directed 

 backwards 18. Plecodus Blgv. 



II. Vertical fins folding in a scaly sheath ; anal 

 spines VIII to X ; teeth obtuse, in a single 

 row 19. PaTetroplus'S\ke. 



1. Lampeologus Schilth. 

 P. Z. S. 1898, p. 134. 



1. Lampeologus fasciatus Blgr. 



Tr. Z. S. XV. p. 7. 

 Lake Tanganyika. 



2. Lampeologus compeessiceps Blgr. 



Tr. Z. S. XV. p. 7. 

 Lake Tanganyika. 



3. Lampeologus mooeii Blgr. 



Tr. Z. S. XV. p. 8. 

 Lake Tanganyika. 



4. Lampeologus oongoensis Schilth. 



P. Z. S. 1898, p. 134. 

 Congo. 



5. Lampeologus modestus Blgr. 



Tr. Z. S. XV. p. 8. 

 Lake Tanganyika. 



6. Lampeologus elongatus Blgr. 



Tr. Z. S. XV. p. 9. 

 Lake Tanganyika. 



7. Lampeologus fueoiper Blgr. 



Tr. Z. S. XV. p. 9. 

 Lake Tanganyika. 



2. JULIDOCHEOMIS Blgr. 

 Tr. Z. S. XV. p. 11. 



1. JULIDOCHROMIS OENATUS Blgr. 



Tr. Z. S. XV. p. 12. 

 Lake Tanganyika, 



• 



