ANNOTATED LIST OF THE SPECIES 161 
A black spot on the nape, a narrow black band across the base of the caudal, 
a broad, silvery lateral band, otherwise translucent. The alimentary canal is a 
thin-walled tube, containing many fish-seales toward the end. 
Subfamily: VANDELLIINAE 
A group of Pygidiidae allied to the preceding subfamily in the lack of nasal 
and mental barbels, and differing in that the rows of lower teeth are in disconnected 
right and left rami, not transverse, and not strong; the mouth narrow; teeth few, 
slender, pointed. 
Genus 61: VANDELLIA Cuvier and Valenciennes 
Vandellia Cuvier and Valenciennes, 1846, Hist. Nat. Poiss., XVIII, 386, pl. 547; 
Eigenmann and Eigenmann, 1890, Occ. Papers Cal. Acad. Sci., I, 344; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, ITT, 401; 
Zigenmann, 1918, Mem. Carnegie Mus., VII, 358. 
Type: Vandellia cirrhosa Cuvier and Valenciennes 
Upper Amazonia to Orinoco, Mamoré, Apuré, L. Hyanuary 
Characterized, with Urinophilus, by great elongation; small, inferior mouth; 
a few teeth in middle of upper jaw; often peculiar clawed teeth on the extremity 
of the maxillary; mandibular rami separated by a wide membrane; opercular 
spines directed caudo-dorsally, the interoperculars caudo-ventrally; gill-opening 
small; origin of ventrals nearer to caudal than to the snout; origin of anal back of 
dorsal; size of head and arrangement of spines would seem to adapt these fishes to 
a life of parasitism, or at least to intrusive habits; the intestine short, straight, and 
very distensible as in blood-sucking forms. The toothed mawxillaries are almost 
unique in this subfamily, among all siluroids. The mandibles lack teeth in one 
substantial group of species, and these Eigenmann (1918 c) has retained as the genus 
Vandellia, at least provisionally, and until the types of V. cirrhosa can be examined ; 
the name Uvrinophilus is provisionally applied to the toothed species until and 
unless cirrhosa is found to have the mandibular teeth. They are certainly wanting 
in V. plazat. 
124. VANDELLIA PLAZAI Castelnau 
Vandellia plazavi Castelnau, 1855, Anim. Amér. Sud, Poiss., 51, pl. xxvii, fig. 1, probably Rio 
Ucayal; 
Eigenmann and Eigenmann, 1890, Oce. Papers Cal. Acad. Sci., I, 345; 
Eigenmann, 1910, Rept. Princeton Univ. Exped. Patagonia, IIT, 401; 
Eigenmann, 1918, Mem. Carnegie Mus., VII, 362, text fig. 30. 
Peruvian and Middle Amazons 
Genus 62: URINOPHILUS Eigenmann 
Vandellia (in part) Cuvier and Valenciennes, 1846, Hist. Nat. Poiss., XVIII, 386, pl. 547. 
Urinophilus Eigenmann, 1918, Mem. Carnegie Mus., VII, 358; 
Eigenmann, 1920, Science, LI, 441. 
