Ilium ruscosum Gilbert 
Head 3 origin of lowemcaudal lobe; depth 5 1/3; abdominal cavity 
■ -u. v-r 
2 3/5 lh entire length measured frljn chin. 
Body little compressed, tapermng and slender posteriorly. Head depressed, 
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width 1 1/3 its length. Snout so|fb, pliable, depressed, length 3/5 its width. 
Eye large, little advanced, 1/2 o» interorbital. Mouth width half of head, 
short labial fold around angle, leeth in 40 rows above, fewer or about 44 
rows below, tricuspid and median |psp largest. Nostrils large, length 2/3 
horizontal eye diameter, internasiiL space half of mouth. Interorbital broad, 
depressed. Grill-opening 1/2 of eyf|. Spiracle superior, close behind eye, 
length 21/2 in eye 
Body largely smooth, only scattiked, small, inconspicuous, sparse, short 
filaments, only visible under a lens. First dorsal inserted well behind 
pectoral base, spine 1 2/3 in spine of second dorsal. Second|dorsal larger, 
spine 1 1/4 in interorbital. Sub caudal lobe nearly large as ajpcond dorsal, 
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* 
not hollowed out or cut concavely as shown in Gilbert 1 s figurejjl Pectoral 
i 
long as first dorsal and not foreshortened as shown in GilbeA's figure. 
Ventral moderate, its base entirely before second dorsal 
» 
Color in alcohol dark brown, lower half or more of body dalker, so 
belly much darker than back. Sides'and back, also top of head, with variable 
