80 CLASS XIV. 



seem to be entirely without nasal apertures or tentacula {A nosmius Peters, 

 Mueller)^ To these differences in the olfactory organ J. Mueller espe- 

 cially has directed attention {Ahh. der Alad. zu Berlin, 1844, Bau der 

 Ganoiden, s. 78, 79). The species are very numerous. 



Sp. Tetrodon Vmeatus L., FaJiaca Hasselq., Iter Pcdcest. pp. 400 — 405, 

 with a long brown stripe running longitudinally on the back and at the 

 sides ; white underneath. The spines are fine, and as though swollen 

 at the point. This and some other species are supposed to be poisonous. 

 (This species is quite different from Tetrodon linealus Bloch, Faun. Ja- 

 pon., Pise. Tab. 125, figs, i, 2.) 



Many species occur in the sea of Japan, as Tetrodon firmamentum, SCHL., 

 Faun. Jap., Pise. Tab. 120, fig. 2, Tetr. ruhripes ScHL., Faun. Jap., Pise. 

 Tab. 123, fig. I, &c. 



Family XI, Sderodermi. Snout conical or pyramidal. Mouth 

 anterior, furnished with teeth. Body covered with hard scales, 

 sometimes very small, or with a lorica composed of angular areolae. 



Balistes L. Body compressed, covered with scales or with a 

 rough warty skin. Eight teeth in each jaw, broad, cuneate. An- 

 terior dorsal fin made up of one or several spines, very near the 

 head, or inserted into the head, posterior soft, opposite the anal. 



Horned fishes. Although no ventral fins are present, there is a pelvis in 

 all (see above, pp. 17, 18) of which the two bones have coalesced. Hence 

 arises a bony keel on the abdomen below, connected forwards with the 

 bones of the pectoral fins, behind with the bones that support the anal fin ; 

 see a figure in Kosenthal Ichthyot. Tafeln, Tab. Xii. fig. 3. 



In many the scales are very small, or their place is supplied by spine-like 

 inequalities on the skin. Here belong the genera Triacanthus, Alutera, 

 and Monaeanthus of Cuvier. In others, which form the sub-genus Balistes 

 Cuv., very large rhomboidal scales are present ; often there are found be- 

 hind the branchial aperture some larger scales or pentagonal horny plates. 



Many species have three or more parallel rows of horny spines on each 

 side of the tail, Sp. Balistes aeuleatus L., Cuv. R. Ani., ed. ill., Poiss. 

 PL 112, fig. 2; — Bal. Cmispicillum Schn., Lac. i. PI, 15, fig. 2 (Baliste 

 americain), Faun. Japan., Pise. Tab. 129, fig. t, a large species, black ; the 

 belly on each side with large pale yellow or dull white oval spots ; from 

 Japan; — Bal. lineatus Bloch, Schn., Syst. Ichfk. Tab. 87, &c. In some 

 species of Monaeanthus Cuv. the tail has a quantity of hard bristles on each 

 side. Sp. Bal. tomentosus L., Gronov. 3Ius. Ichth. Tab. vi. fig. 5. 



See HoLLARD Monographie des Balistides, A nn. des Se. natur. 3e Serie, 

 Zool, Tom. XX. pp. 71— I [4, PI. 13; 4iJ;me Serie, i. 1854, pp. 39—72, PI. 

 '^> 3; PP- 303 — 339> ?!• 5, "• PP- 321 — 366, PI. 12 — 14 ; suite et fin. Alio- 

 tdres, Tom. iv, 1855, pp. 5 — 22, Additions et Correetions, pp.. 23 — 27. 



