ADDENDA. 431 



Page 73. Add a new species : — 

 6. Chrysichthys acutirostris. 



Closely allied to Ch. nigrodigitatus, but with a longer snout, 

 smaller eye, and shorter dorsal spine. 



D. 1/6. A. 13. P. 1/9. 



The height of the body is contained five times and one-third in the 

 total length (without caudal), the length of the head thfice and one- 

 third. Snout long, pointed, the diameter of the eye being one-fifth 

 of the length of the head, one-half of the extent of the snout, and 

 rather more than the width of the bony parts between the orbits. 

 The teeth on the palate form two small groups, separated by an in- 

 terspace equal in width to that of one of the groups. Barbels and 

 nuchal cuirass as in Ch. nigrodigitatus. The dorsal fin is higher than 

 the body, but much lower than the head is long ; its spine is strong, 

 slightly serrated behind, its length being less than two-thirds of that 

 of the head, and equal to that of the pectoral. Adipose fin shorter 

 than dorsal ; caudal deeply forked, with the upper lobe longest. 



Angola. 

 a. 9| inches long. Golungo Alto. Presented by Dr.Welwitsch. 



Page 75. Macrones aleppensis. 



Synon. : Bagrus halepensis, Heehel, in Russegger, Reise, i. p. 1091. 



pi. 13. fig. 2. 



On referring to the second edition of Russell's Natural History of 



Aleppo (vol. ii. p. 210. pi. 7. fig. 1), I find that this fish had been 



named by Solander Silurus pelusius. Therefore the specific name 



ought to be Macrones pelusius. 



Page 109. Hemisorubim platyrhynchus. 

 a. Fine specimen. Surinam. From the Stuttgart Museum. 



Page 184. Euglyptosternum coum. 



Synon. : Arius cous, Heckel, in Russegger, Reise, i. p. 1094. taf. 13. 

 fig. 3. 



Page 192. Ageniosus brevifilis. 



Add to the diagnosis : — 

 The diameter of the eye is nearly one-half of the distance between 

 orbit and posterior nostril. The porus axillaris a simple" very small 

 foramen. 



Page 192. Add a new species : — 



3 a. Ageniosus axillaris. 

 D. 1/6. A. 38. P. 1/15. V. 8. 

 This species is very similar to A. brevijilis, but may be readilv 

 distinguished by its larger eye and by its porus axillaris. 



The length of the head is contained thrice and three-fourths in 

 the total (without caudal) ; it is covered with soft skin above, and 



