ART. 10 NOTES ON MYCTOPHINE FISHES PARR 41 



anal organ well behind the base of anal fin. 4 Prc^ equally spaced 

 in an even curve, well separated from the posterior AO and with the 

 upper organ well below the end of the lateral line. 



Total length without caudal fin 108 mm. Proportions in per cent 

 of the total length without caudal fin : Length of head, 26. Diameter 

 of eye, 6.5. Length of lower jaw, 19.5. Greatest height, 19.5. Dis- 

 tance from snout to dorsal fin, 42. Distance from snout to ventral 

 fins, 44. Distance from snout to anal fin, 64. 



The YLO of D. com^uleus is described as being closer to the bases 

 of the ventral fins than to the lateral line, not about midway be- 

 tween as in the type of D. woitctsei^ but with the possible exception of 

 the arrangement of the photophores in the posterior part of the 

 antero-anal series, this seems to be the only difference of any signifi- 

 cance whatever which would appear to verify the taxonomic distinct- 

 ness of the two species, above suggested as a possibility on the basis of 

 the described observations on the circumorbital organs of D. watasei. 



The type specimen of D. watasei was obtained in Sagami Bay, 

 Japan. 



DIAPHUS ANTEORBITALIS Gilbert. 1913 



Diaphus anteorbitalis Pare, 1928. 



Lamprossa anteorbitalis Jordan and Hubbs, 1925. 



Material investigated. Type specimen No. 74471, U.S.N.M. 



This species has been very adequately and accurately described and 

 figured by Gilbert, 1913 (p. 92 and pi. 12, fig. 1), and has been cor- 

 rectly defined in the previously rendered key. 



The distance from the upper end of the base of pectoral fin to the 

 PLO was found to be 3.5 mm., the distance from PLO to the lateral 

 line canal being only 4 mm. 



The type specimen apparently is a spent, the sex therefore being 

 indeterminable without microsections. 



Known only from Japan. 



DIAPHUS ADENOMUS Gilbert, 1905 

 Diaphus adenomus Jordan aud Jordan, 1922; Parr, 1928; Fowler, 1928. 



Material investigated. Type specimen No. 51533, U.S.N.M. 



The author can not agree in the statement made by Gilbert, 1913, 

 p. 92 (under discussion of D. anteorbitalis) that " in D. adenomus, 

 both the superior preorbital and the extension between eye and nostril 

 are lacking." An inspection of the type specimen on the contrary 

 reveals the presence of a small, but quite distinct upper antorbital 

 organ, which seems perfectly similar to the corresponding organ in 

 D. anteorbitalis. The author was altogether quite incapable of dis- 



