618 
PROCEEDINGS OF THE NA TIONAL MUSEUM. 
15. LEPIDAPLOIS PERDITIO (Quoy and Gaimard ). 
Labrus perditio Quoy and Gaimard, Voy. Astrolabe, 1834, p. 702, pi. xx, fifr. 4; 
" obtained on dangerous reefs in the Pacific." 
Cossyphus perdtVioCuviER and Valenciennes, Hist. Nat. Poiss., XIII, 1837, p. 125 
(after Quoy and Gaimard). 
Cossyphus atrolumbus Cuvier &nd Valenciennes, XIII, 1837, p. 123; lie de 
France. — Gunther, Cat. Fish., IV, 1862, p. 105; Mauritius, Minerva Reef, 
Saumarey Reefs, Aneitum. 
Head 3i in length; depth 2i; depth of caudal peduncle 6; eye 5i 
in head; interorbital space 3^; snout 2|; D. XII, 10; A. Ill, 12; 
scales in lateral series 27; between lateral line and insertion of dor- 
sal 5; between lateral line and insertion of anal 13. 
Body rather heavy and thick, the dorsal and ventral outlines pretty 
Fig. 2. — LEPIDAPLOIS perditio. 
evenly rounded except above occiput, where there is a slight elevation; 
head bluntly pointed. Jaws equal. Teeth in 2 series on anterior part 
of jaws, in a single series laterally; the inner series of upper jaw coa- 
lesced into a sharp, slightly serrated ridge; in the lower jaw the teeth 
are coalesced at the bases, the tips being quite prominent laterally; 
outer series represented by 4 strong canines of equal size in upper jaw; 
by 4, the inner 2 of which are small and close together, in the lower 
jaw. Edge of preopercle smooth or slightly serrated. Gill rakers on 
first arch 6+11, short, pointed; pseudobranchia? very large. Soft dor- 
sal, anal, and caudal with a basal sheath of scales; interorbital space, 
snout and lower jaw naked, 9 series of scales on cheek, a narrow naked 
space along edge of preopercle. jVIeml)rane of dorsal incised almost to 
bases of spines, the membrane covering each spine thickened and pro- 
jecting some distance beyond tip of spine; anterior spines longest, 4| 
in head, longest rays, 2^, thu'd anal spine 3. Caudal truncate, the 
uppermost and lowermost rays formmga falcate projection, the upper 
rays I3 m head. -Ventral rays almost reaching first anal spine. Pec- 
torals li 111 head. 
