APODAL FISHES OF AMERICA AND EUROPE. 
671 
• ANALYSIS OF THE SPECIES OF ILYOPH1S. 
a. [Body narrow, compressed throughout; snout and jaws slender; gape one-half 
length of head, extending beyond the eye for a distance less than the diameter of 
the latter; maxillary teeth small, bluntly conic, in narrow band ; teeth on vomer 
large, conic, those on shaft of vomer in single row ; teeth in mandible in narrow 
band, those on the inner series enlarged and retrorse though less than half the 
size of the vomerine teeth; front of pupil over end of second third of length of 
jaw; gill-slits narrow, inferior, horizontal, crescent-shaped, about equaling hori- 
zontal diameter of eye, their lower (anterior) ends separated by a distance equal 
to their own length, their upper (posterior) euds by 1£ times that distance; head 
2 in trunk ; head and trunk 3£ in total length ; pectorals small, 6 in head, rays evi- 
dent ; scales very fine, arranged in groups at right angles to one another ; lateral 
line running high anteriorly, its pores white and conspicuous. Color brown, the 
fins, lower side of head, and branchial regions darker.] {Gilbert.) 
Brufneus, 125. 
125. ILYOPHIS BRUNNEUS. 
Ilyoplm brunneu8 Gilbert, mss. (Chatham Island). 
Habitat ; Galapagos Islands. 
Etymology ; Brunneus , brown. 
A single specimen 15 inches long was collected by the Albatross near 
Chatham Island, Galapagos, 634 fathoms. 
Family XII.— SYNAPHOBRANCHIDi^E. 
This group consists of deep-sea eels, differing from the Anguillidce in 
having the gill openings externally confluent into a single slit. The 
following diagnosis is given by Dr. Gill : 
Enchelycephalous Apodals with conic, pointed head, moderate opercular apparatus, 
lateral maxillines, cardiform ‘teeth, distinct tongue, inferior branchial apertures dis- 
charging by a common aperture, continuous vertical fins, pectorals well developed, 
scaly skin, and nearly perfect branchial skeleton. 
The form of the branchiostegals is characteristic. They are in mod- 
erate number (about 15), attached to the sides of the compressed cera- 
tohyal and ephiyal, slender, abbreviated, and moderately bowed, not 
\>eing curved up above the operculum. Two genera are known ; very 
similar to each other. 
ANALYSIS OF GENERA OF S YNAPHOBRANCHIDAC . 
a. Dorsal fin low, beginning behind vent ; vomerine teeth in a single patch ; pecto- 
rals long, longer than the rather slender snout Synaphobranchus, 47. 
act. Dorsal fin beginning close behind base of pectorals ; vomerine teeth in two patches, 
one behind the other ; pectorals short, not longer than the short snout. 
Histiobra.nchus, 48. 
Genus 47. — SYNAPHOBRANCHUS. 
Synaphobranchus Johnson, Proc. Zool. Soc. London, 169, 1862 (kaupi). 
Type: Synaphobranchus kaupi Johnson =Murcena pinnata Gsonow. 
Etymology : united ; ppaf/ta, gills. 
This genus contains two or three species of deep-sea fishes from the 
Atlantic and Pacific. 
