gilbekt: the lantern-fishes of japan 95 



Several specimens from Sagami Bay (C. M. No. 4603) were obtained from 

 Mr. Alan Owston, and have been compared with the cotypes of D. watasei 

 from the same locality. There seems no reason to doubt the identity of this 

 material with D. coeruleus from the Indian Ocean. D. engraulis from the 

 Philippines agrees in all respects except the smaller eye (said to be one-fifth 

 the length of the head) but the figure shows it larger than this, and probably 

 no difference exists. 



22. Diaphus latus sp. nov. (Plate XIII, fig. 1.) 



Type 75 mm. in total length, 64 mm. to base of caudal, from Sagami Bay; 

 collection of Alan Owston (C. M. No. 4604). 



Most nearly related to D. splendidus, signatus, and sagamiensis, but with 

 deeper body, smaller eye, the pre-orbital restricted to the anterior border of the 

 eye, the suprapectoral higher, the third supra-anal and the posterolateral in con- 

 tact with the lateral line, the fourth precaudal immediately below it; the first 

 antero-anal greatly elevated, nearly verticaUy above the second, the second to 

 fifth antero-anals in a straight line, parallel with anal base. 



Measurements in hundredths of length without caudal: Length of head 25; 

 diameter of eye 5.5; length of snout 4; width over middle of orbit 7; length of 

 maxillary 18; depth of body 23; of caudal peduncle 10; distance from tip of 

 snout to dorsal 39; to base of ventrals 41; to front of anal 60; to adipose 76. 

 Length of pectoral 11.5; of ventral 18. 



Dorsal rays 15, including 3 rudiments, the posterior ray split to base; anal 

 rays 16, including two rudiments; pectoral rays 12; ventral rays 9, the outer a 

 short rudiment. Scales of lateral fine 37, the upper supra-anal on the 18th scale, 

 the posterolateral on the 26th or 27th. Gill-rakers long and slender, 7 + 15 (in 



cotype). 



Body deeper than in related species; eye small, the profile rising well above 

 its dorsal border; snout short, bluntly rounded; preopercular margin obhque, 

 the maxillary reaching its margin. Pectoral short, not reaching base of ventrals, 

 the latter not beyond the vent. Base of ventrals under or slightly behind the 

 origin of dorsal; origin of anal slightly behind vertical from last dorsal ray, the 

 last anal ray beneath the adipose. 



Scales of lateral fine not enlarged, their vertical diameter nowhere greater 

 than their distance from mid-dorsal line. 



Photophores.— Upper pre-orbital a small ocellated dot under the edge of the 

 ' frontal, as in D. signatus and D. agassizi; lower pre-orbital occupying the area 



