538 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 
XLV. CASIOSOMA. 
Czsiosoma (Kaup) Bleeker, Systema Percarum Revisum, I, 11, 1875 (@quipinnis). 
Type: Scorpis equipinnis Richardson. 
Etymology: Cesio, an allied genus; capa, body. 
This genus is based on an Australian species which differs from the 
type of Scorpis (Scorpis georgianus) in having the soft dorsal and anal 
low and not faleate. The generic value of this character is at least 
open to question. In the form of the soft dorsal, Casiosoma resembles 
Medialuna, but in the latter genus the soft dorsal and anal are pro- 
portionately much shorter and the dorsal spines are not graduate. We 
refer to Cwsiosoma a South American species we have not seen, but 
which seems to have the same generic characters. In all these species 
the incisors have been described as cylindrical or conic, but they will 
probably be found to have a flattened form, as in Medialuna, and to be 
really lanceolate. 
ANALYSIS OF AMERICAN SPECIES OF CASSIOSOMA, 
a. [Body deep, the outlines strongly arched; mouth very oblique, the maxillary 
reaching front of eye; snout shorter than eye; both margins of preopercle 
finely toothed; nostrils round, close together; preorbital finely toothed; head 
completely scaled, except the snout, lips, and part of each jaw; dorsal spines 
erowing steadily longer to the last, which is about half head; second soft ray 
of dorsal highest; third anal spine slightly longer than eye; pectoral, 1}in head; 
ventral 24; caudal deeply notched, its lobes slender; soft rays of vertical fins 
closely scaled. Color, dusky violet above, silvery gray below; fins yellowish; 
body sometimes irregularly mottled with darker. Head 4 in length; depth 24; 
eye 34in head. D.x,27; A.1, 25. Seales, 70.] (Steindachner)..CHILENSE, 155, 
155. CHSIOSOMA CHILENSE. 
Scorpis chilensis Gay, ‘‘ Hist. Chil. Zoology, 1, 220; Ictiol., lam. 6, f. 1.” (Juan Fer- 
nandez); Giinther, 11, 64 (copied); Steindachner, Ichth. Beitrige, m1, 14, 
1875 (Juan Fernandez). 
Habitat: Islands of Chile. 
Etymology: From Chile. 
This species is known to us only from the scanty account copied by 
Giinther from Gay and from the detailed description given by Stein- 
dachner. According to Steindachner, the species reaches a length of 
a foot, and is very common on the coasts of Juan Fernandez. 
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