149 
Cyclothone GOODE and BEAN, Bull. Ifys. Comp. Zool., vol.10, 1883, p.221. 
Type Cyclothone Lusca GOODE and BEAN, monotypic. 
Neostoma FILHOL, La Nature, 1884, p.184. Type Neostom a bathyphilura FILHOL, 
monotypic. 
Body elongate, somewhat compressed. Head conic, compressed. Eye very 
small, much smaller than snout. Mouth cleft very wide, lower jaw projecting. 
Premaxillary small and .long slender siclcle-shaped maxillary more or less dilat¬ 
ed posteriorly. Teeth numerous, needle like, larger posteriorly, sometimes 
few short fangs anteriorly in mandible. Teeth present on palatines and 
pterygoids, present or absent on vomer. Second suborbital not enlarged. Gill 
opening very large. Gill membranes free from isthmus. Gill rakers numerous, 
long, bristle like. No pseudobranchiae. Branchiostegals 12 to 14, short. 
Scales absent or large, very thin and deciduous, often only as faint markings 
on skin. Two opercular photophores. An incomplete lateral series of small 
photophores and ventral series complete. Dorsal rays 13 to 15, postmedian. 
Adipose fin present or absent. . nal rays 16 to 20, postmedian, opposite 
dorsal. Caudal forked. Pectoral in lower half «f body height. Ventrals 
slightly premedian. 
ANALYSIS OF SPECIES 
1 
a. Ground color pale or whitish; gill rakers less than 20 (13 to 19); 
lateral photophores 6 or 7. 
1 
b. Gill rakers 3 -y 11 or 12 signata . 
2 
b;_ Gill rakers 3 or 4 + IS to 16 braueri . 
2 
a. Ground color dark brown or dusky; gill rakers 20 to 23. 
“ 1 
c. Photophores present. 
