410 The Squamipinnes 
water from the Red Sea to Tahiti. The coloration is rather 
plain olive or brown, sometimes with white spots, sometimes 
with bluish lines. The species are very much alike and all 
belong to the single genus Siganus. One species, Siganus 
juscescens, dusky with small, pale dots, is a common food- 
fish of Japan. Others, as Siganus oramin and Siganus ver- 
miculatus, occur in India, and Siganus punctatus, known as lo, 
abounds about the coral reefs of Samoa. Szganus vulpinus 
differs from the others in the elongate snout. 
A fossil genus, Archoteuthis (glaronensis), is found in the 
Tertiary of Glarus. It differs from Szganus in the deeper body 
and in the presence of six instead of seven spines in the anal 
fin. 
The real relationship of the Siganide is still uncertain, but 
the family is probably most nearly allied to the Acanthuride, 
with which the species were first combined by Linnzeus, who 
included both in his genus Teuthis. In the structure of the 
vertical fins the Szganid@ resemble the extinct genus Pygeus. 
