XXII HAPLOMI 6O1I 
ordinary: Black-Fishes will remain frozen in baskets for weeks, 
and when thawed are as lively as ever, one having been swallowed 
in a congealed condition by a dog, thawed out by the heat of 
the stomach, and vomited up alive. 
Fic. 370.—Dallia pectoralis, $ natural size. (After L. M. Turner.) 
Fam. 6. Scopelidae.—Praemaxillaries much elongate, and 
completely excluding the maxillaries from the oral border. 
Supraoccipital in contact with the frontals, sometimes partly 
covered by the parietals; opercular bones all well developed. 
Basis cranii simple. Ribs sessile; no parapophyses on the prae- 
caudal vertebrae; epipleurals and epineurals. Post-temporal 
forked, the upper branch in contact with the epiotic or the 
-supraoccipital, the lower with the opisthotic ; post-clavicle present. 
An adipose dorsal fin often occurs; luminous spots often present 
on head and body. Ventral fins with 7 to 10 rays. Air-bladder 
sometimes absent. 
A large family (over 100 known living species), mostly of 
pelagic and deep-sea Fishes. <A great number of fossil types 
have been described. 
Recent genera : 
A. Without photophores: Saurus, Saurida, Bathysaurus, 
Harpodon,  Scopelarchus, Aulopus,  Odontostomus, Omosudis, 
Sudis, Paralepis, Bathypterois, Benthosaurus, Chlorophthalmus, 
Ipnops. B. With photophores: Scopelus, Duasyscopelus, Neo- 
scopelus, Scopelengys, Nannobrachium, Scopelosaurus. 
- Fossil genera : 
A. Cretaceous: Sardinioides, Acrognathus, Leptosomus, Sar- 
dinius, Dactylopogon, Nematonotus, Microcoelia, Opisthopteryx, 
Apateodus, Rhinellus. B. Eocene, Oligocene, and Miocene: 
Omiodon, Scopeloides, Parascopelus, Anaptersu. ; 
