1909-] R- E. lyi^OYD : Deep-Sea Fish caught by the "Investigator." 169 



breadth of the disk. The snout projects beyond the mouth, though, to a somewhat 

 less extent than in D. nasutus. The nasal tentacle, however, is exactly as in that 

 species ; it " ends in a pair of fleshy balls with a pair of filaments above and between 

 them." 



The diameter of the eye is about ith of the length of the disk. The eyes are 

 rather more than a diameter apart. The caudal and pectoral fins are about equal in 

 length and are one-fifth of the total length. 



Up to this point the description is almost the same as that of D. nasutus. The 

 only difference is in the dermal armature. The upper surface is covered with sharp 

 spines on a stellate base. They are larger and less numerous that in D. nasutus. 

 The ventral surface of the tail and disk is covered with smooth skin entirely devoid 

 of spines except for three minute spines near the bases of the pelvic fins. 



Colour dark grey. One specimen, 75 mm. in length, from the Bay of Bengal, off • 

 Arakan, 1,100 fathoms. Station 326. Registered No. ^^■^^. 



Malthopsis triangularis , sp. nov. 



Illustr. Zool. ''Investigator," Fishes, plate xlv, figs, i, la (1909). 



B. 5, D. 5, V. 2-3, C. 9. 



The greatest breadth measured between the subopercular spines is slightly less 

 than the greatest length excluding the caudal fin (proportion 9 to 10). The antero- 

 lateral borders of the disk are straight and together form a right angle. The nasal 

 spine is nearly vertical and is slightly more than half the diameter of the eye in 

 length. The caudal and pectoral fins are of the same length and are longer than the 

 pelvic fins in the proportion of 3 to 2. The caudal fin is slightly less than a fifth of the 

 total length. There are seven large ossicles between the base of the ventral fins and 

 the vent. One of these is large and central and is surrounded by the six others which 

 are in contact with it. There is a pair of plates between the bases of the pelvic fins 

 and five plates in front of them. The upper surface is covered with stellate ossicles 

 except on either side of the middle line where there is an area of naked skin. This is 

 bounded externally by an oblique row of ossicles which converge in the direction of 

 the root of the tail. The subopercular spines are as large as the nasal spine and bear 

 four transparent spinelets. 



There are two gills ; teeth are present on the vomer and palatines as in other 

 species of the genus. 



Two specimens from 279 fathoms in the Andaman Sea, Station 332. Registered 

 Nos.H'-S --1— • 



Family ANTBNNARIID^. 



Chaunax apus, sp. nov. 



Illustr. Zool. '' Investigator" Fishes, plate xlv, fig. 6 (1909). 



Resembling Chaunax pictus (Lowe) in every respect except that the pelvic fins 

 and the nasal tentacle are represented by minute rudiments. Colour as in C. pictus. 



