568 ORDER PLECTOGNATHI. 



I separate from the tetraodons, and even from all 

 the species susceptible of inflation, 



A. Without spots: Tetr. immaculatus, Lacep. I. xxiv. 1. ; Russ. 

 I. 26. 



B. With black spots : Tetr. mouchete, Lacep. I. xxv. 1 ; or T. 

 Commersonii, Schn., Russell, i. 28. Tet. Jluviatilis, Buchan. xxx. 

 1. Tetr. geometricus, Bl., Schn., Catesb. II. xxviii. 



C. With black bands : Tetr. fahaca, or T.physa, Geoffr., d'Eg., 

 Poiss. I. 1. T.lineatus, Bl. 141, with which Tetr. psittatus, BL, 

 Schn. 95, is at least very near allied. 



D. With pale spots : Tetr. testudineus, BL, 139, of which T. re- 

 ticularis, BL, Schn. appears to be a variety. T. hispidus, Lacep. I. 

 xxiv. 2, and Geoffr., Eg., Poiss. I. 2. T. patoca, Buch. xviii. 2. 



2d. With body smooth throughout : T. Iceuissimus, BL, Schn. T. 

 cutcutia, Buchan. xiii. 3. 



3d. With the flanks only smooth, and with lateral tentacula : T. 

 Spengleri, BL 144 ; Seb. III. xxiii. 7 and 8, which is the same as 

 the Tet. Plumieri, given after Plumier, Lacep. I. xx. 3. 



N.B. What Lacepede has taken for a hump is only the pectoral of 

 the other side, the point of which is visible ; and the Sphero'ide tuber- 

 cule, established by Lacepede, ii. 1, is derived from the same plate 

 of Plumier, and represents the same fish in a face view. Schneider 

 had already taken notice of this, BL, Schn. Ind. pi. vii. T. hon- 

 kennii, Bl. 143. 



4th. With smooth flanks ; without lateral tubercles : T. ocellatus, 

 Bl. 145. T. turgidus, Mitch, pi. vi. f. 5. T. lunaris, Russ. i. 29. 



II. With oblong head. 



1st. With the flanks only smooth : T. argentatus, Lacep., Ann. 

 Mus. IV. xiii. 



2d. With back and flanks smooth ; the belly alone rough : T. 

 lagocephalus, Bl. 143 ; and Seb. III. xxiii. 5 and 6. T. laevigatas, 

 Will. pi. i. 2. 



III. With carinated back : T. rostratus, Bl. 146. 2, to which 



