LORICARIA. 137 



to direct the attention of future travellers who may 

 have opportunities of investigating the subject in 

 the South American waters. It should be noticed, 

 that although the specific characters given by 

 Schneider are very close to each other, in that of 

 L. cirrhosa^ " thorace inferius squamato" seems of 

 importance. 



Formula of the fins of L. cataphracta^ given by 



ScTineid. P. 1/7— V. 1/6_A. 5 — C. 16— D. 8 1/1. 

 Vahnc. B. 4 _ D. 1/7— A. 1/5— C. 10— P. 1/5— V. 1/5. 



L. cirrhosa^ given by Schneider, 



B. 4— P. 1/7— V. 1/6— A. 1/6— C. 12— D. 1/8. 



The habits of Loricaria have not yet been de- 

 tailed, nor their anatomy described. Nine distinct 

 species are described or indicated by Valenciennes, 

 and figures of three of these have been given as 

 new in the Atlas to D'Orbigny's Voyage (pi. 6) ; 

 only one, the L. cataphracta^ is noticed as occurring 

 in the waters of Guiana. 



HYPOSTOMA. 

 The next form in the Collection which will re- 

 ceive our notice is the genus Hypostoma, Lacepede^ 

 of which Mr. Schomburgk has brought three spe- 

 cies, two of them apparently difi'erent from those 

 described in the last volume of the " Histoire Na- 

 turelle des Poissons," by Valenciennes. Three sub- 



