222 A HISTORY OF RECENT CRUSTACEA 
was the subject of a monograph by Kroyer in 1856, and 
the interest of the subject seems still very far from being 
exhausted. 
Sciacaris, ‘ the shadow shrimp,’ is interesting as having 
a telson which ends in ‘two lateral uniarticulate appen- 
dages,’ but it is doubtfully founded on three specimens 
from the Pacific, none of which is adult, and none of which 
exceeds by more than a hair’s breadth a sixth of an inch 
in length. 
Acetes indicus was described by Milne-Edwards in 
1830, the type-specimens having been taken at the mouth 
of the Ganges. According to Spence Bate, these are the 
only specimens known, so that some one must be respon- 
sible for a wrong date when he says that with them in the 
Paris Museum ‘ was a note stating that they were taken 
in 1852 from a large fish “21 feet in length and 25 
broad” (Dicerobates eroogoodoo); its stomach was filled 
with myriads of these little crustaceans, which were 
carried away in bucketfuls by the fishermen, and thou- 
sands were left scattered about the shore.’ As the 
crustacean is only an inch long, the above-mentioned fish, 
otherwise known as the Ox-ray, or Sea-devil, which may 
attain the weight of a ton, and has a mouth large enough 
to swallow a man, would no doubt find room for a shoal of 
these little shrimps. The Ox-ray occurs in the Mediter- 
ranean, and might well be the ‘great fish’ referred to in 
the book of Jonah. 
Leucifer is without branchiz ; it has the two anterior 
pairs of trunk-legs without chele, and the chele of the 
third pair imperfect; the ova are carried beneath the 
trunk, but apparently without any special means of attach- 
ment. The genus is widely distributed over the tropical and 
sub-tropical waters of the Atlantic and Pacific, but is sup- 
posed to be limited to the two long known species, 
Leucifer typus (Vaughan Thompson) and Leucifer Rey- 
naudii, Milne-Edwards. It has been made the subject 
of an elaborate study by Professor Brooks. Atter the 
Nauplius and Zoea stages, the young appear to go through 
transformations corresponding with those of WSergestes. 
