PHILIPPINE MACROUROID FISHES GILBERT AND HUBBS. 525 



H. gracilis is widely separated from all other species of the genus 

 with the exception of the recently described H. tenuis, from which 

 species it differs in the circular form of the lens-shaped organ be- 

 fore the anus; in the better development of the striations on the 

 sides of the isthmus; in the less reduced character of the gill-rakers, 

 and in the greater length of the barbel. 



Only the type-specimen is known. 



{gracilis, in reference to the slender form.) 



Subgenus Hymenocephalus Giglioli. 



45. HYMENOCEPHALUS LONGICEPS Smith and Radcliffe. 



Hymenocephalus longiceps Smith and Radcliffe, Proc. U. S. Nat. Mus., 



vol. 43, 1912, p. Ill, pi. 23, fig. 3. 

 Hymenocephalus striatissimtis Weber, Die Fische der Sibo#a-Expedition, 



1913, p. 168 (specimen from Siboga station 38). 



Ldst of stations. 



A Ibatross 

 station. 



5301.. 

 5317.. 

 5440.. 

 5441.. 

 5117.. 

 5118.. 

 5265.. 

 5290.. 

 5291.. 

 5292.. 

 5375.. 

 5121.. 

 5197 i. 

 5411.. 

 5412.. 

 5453. . 

 5454.. 

 5459.. 

 5476.. 

 5565.. 

 5566.. 

 5580. . 

 5621.. 



Locality. 



China Sea, near Hongkong . . . 



China Sea, near Formosa 



China Sea, off western Luzon, 

 do. 



China Sea and adjacent waters off southwestern Luzon, 

 do. 



do. 



.do. 

 .do. 

 .do. 



Vicinity of Marinduque Island . 



Off east coast of Mindoro 



Vicinity of western Bbhol 



Between Cebu and Bohol 



.do. 



Off southeast coast of Luzon . 



do 



.do 



.do. 



Between Jolo and Tawi Tawi . 

 do. 



Vicinity of Darvel Bay, Borneo 



Between Gillolo and Makyan Islands (0° 15' 00" N., 127° 24' 35' 

 E.). 



Depth in 

 fathoms. 



208 

 230 

 172 

 186 

 118 

 159 

 135 

 214 

 173 

 162 

 107 

 108 

 174 

 145 

 162 

 146 

 153 

 201 

 270 

 243 

 244 

 162 

 298 



Bottom 

 tempera- 

 ture. 



'F. 



50.5 

 50.6 

 53.2 

 52.2 



51.5 

 52.4 



54.3 

 55.2 

 54.8 



48.3 

 52.3 

 52.5 

 55.8 



Number 

 of speci- 

 mens. 



1 

 1 

 1 

 1 

 3 

 1 

 1 

 1 

 11 

 1 

 1 

 9 

 1 

 7 

 3 

 8 

 2 



1 

 1 

 1 

 5 

 2 



1 The data corresponding to the tag borne by this specimen is: station 5179, Apr. 9, 1908. As station 

 5179 was occupiea on Mar. 25, at a depth of only 37 fathoms, it seems likely that 5179 was written for 5197 

 (occupied on Apr. 9). 



* One of these specimens is the type of the species (Cat. No. 72928, U.S. N.M.). 



We have a few notes to add to the original description. 



The tail ends in a very long filament, the tip of which is broken 

 off in the type; the head is contained about 6.5 times in the total 

 length when the tail is entire. 



The posterior lens-shaped body, lying just before the anus, is 

 unusually large in this species, being about half as wide as the pupil ; 



