LINNZAN SYSTEM. — FISH. 153 
Balistes. File-fish. Spiracle solitary; ventral fins solitary, 
keel-shaped. 
Ostracion. Tortoise-fish. Spiracle solitary; no ventrai fins ; 
body mailed. 
Tetraodon. Sguare-fish. Spiracle solitary; no ventral fins; 
belly prickly. 
Diodon. Porcupine-fishk. Spiracle solitary; body covered 
with spines. 
Cyclopterus. Lump-fish. Spiracle solitary; ventral fins 
united into a funnel. 
-Centriscus. Snout-fish. Spiracle solitary ; ventral fins united ; 
snout long. 
Syngnathus. Pipe-fish. Spiracle solitary ; no ventral fins ; 
body crusted, long. 
Pegasus. Sea-horse. Spiracle solitary ; ventral fins two ; snout 
ciliate-toothed. 
(204.) The following genera, belonging to the order 
Nantes, have been added by the disciples of Linneus, 
and incorporated in their editions of his Systema Na- 
ture :— 
Pristis. Saw-fish. Separated from the sharks by Shaw. 
Gastrobranchus. Huag-fish. The connecting link between 
Vertebrata and Annulosa. 
Spatularia. Spoon-fish. Allied to the saw-fish. 
(205.) The class of fish (Pisces), as may be sup- 
posed, was placed by Linneus immediately after his last 
order (Nantes) of reptiles. His primary divisions being 
in number four, characterised as follows : — 
I. Aropat. Ventral fins none. — II. Jucutar. Ventral 
fins before the pectoral. — III. Tuoracic. Ventral fins 
under the pectoral. —1V. Axspominat. Ventral fins be- 
hind the pectoral. 
(206.) It is in the arrangement of this class, more 
than in any other, that we find the strongest proof that 
Linneus, so far from wishing the Systema Nature to 
be thought the natural system, intended it should be 
essentially artificial. The two great typical divisions of 
the class were undoubtedly known to the learned Swede, 
for he gave them to the world in the admirable volume 
he edited of the works of Artedi; of whom we shall 
hereafter speak. In that volume, likewise, we find the 
Nantes occupying their proper station among the true 
