Scales of the Brotulid Fishes. 321 
distinctly apicad of middle; radii numerous, the basal ones 
broad hyaline lanes between the interrupted circuli. 
The Bythitine, as restricted by Radcliffe, seem rather 
closely allied on scale-characters ; Diplacanthopoma is the 
most distinct of the genera examined. On the other hand, 
I am at a loss to separate the Bythitinz on scale-characters 
from the group of Neobythitine typified by Glyptophidium. 
The species of Bythitine may be separated from those of 
Neobythitinee on comparison of scales, but there is no 
general or important character to separate the subfamilies. 
NeoBYruirinz. 
Radii absent or greatly reduced (tribe Basso- 
DELLE) Se ec Ge IO CERRO eT CCE Ie 
Teantinwell developed: s0..). 02k. 6 sees ols 2. 
1. Seales small, 2 mm. long or less; rudi- 
ments of basal radii, or radii absent, 
but apical circuli connected by fine 
WIGS ened Sh eooe SON COOPER Ce COC Ore Eretmichthys. 
Scales large, over 4 mm. long; distinct 
basal radii, of the type of those in 
Diplacanthopoma, and occasional rudi- 
ments of apical radii; a secondary 
network of fine lines in apical field .. Bassozetus robustus. 
Seales very large, about 8 mm. long and 
5°25 broad, nucleus a little below 
middle; no radii; minute reticulation 
of apical field very distinct .......... Bassozetus elongatus. 
2. Scaleselongated; nucleus above the middle; 
basal radii separated from lateral, which 
haye a quite different direction, or 
lateral radii absent (tribe Monomito- 
(LIS) lon Eno Be nic Ooi nee oponc 3. 
Scales broad-oval or elongated; radii all 
around, not or hardly modified .,..:. 5. 
oe areral TAGE ADSCBE. . 2. 24s cals seis 6 wef cle Monomitopus microlepis. 
ite rally EXeNGPLCSCM ED wi ettntciera's siols' e's orem are 4, 
4, Lateral radii feebly developed .......... Monomeropus garmant. 
Lateral radii well developed, but very 
quel yap aeeday yy te acter sPadcie er tery aie) te Monomitopus pallidus. 
5. Scales broad-oval or subquadrate ........ 
Seales more elongate .........ccescseee & 
6. Scales small, regularly oval; nucleus well 
Pasadvot-middlow 1. «<i. nee « »ee+. Barathrodemus. 
Scales larger, more or less quadrate...... Glyptophidium. 
. Network of radii and circuli in apical field 
forming transversely elongated areas, 
not broken up by a secondary reticula- 
tion of fine lines*; nucleus far basad. 8. 
bea | 
* Latinucleate scales of Homostolus show this feature, however. 
