Ss 
As Paulson’s work on the Crustacea of the Red Sea appears 
to be rare and when available presents an obstacle to some 
students by being in the Russian language, I venture to trans- 
late his definition of the genus Anchistio1des :—‘* Body com- 
pressed. Peduncle of upper antennae very short; outer 
flagellum very thick, and at middle of its length furcate. Scale 
of outer antennae wide. Mandibles as in Anchistia. Anterior 
margin of cephalothorax with a single spine. Endognath of 
second maxillae rudimentary. Exognath of first maxillipeds 
laminar. Outer maxillipeds slender, without exognath, and 
the last two joints considerably shorter than the second (ante- 
penultimate). The first two pairs of thoracic legs chelate, the 
second more strongly than the first. Inner branch of first 
pleopods in the male short, but sub-divided, the inner division 
having hooks, met with in Caridea only on appendage of the 
following pleopods. The second pair as in Anchistia and 
Palaemon. Hind margin of telson truncate, not acute.” 
There are thus some notable agreements in the maxillipeds 
and pleopods, but the triple flagellum and short peduncle of the 
first antennae, the palpless mandibles, and the rudimentary 
endopod of the second maxillae, keep Anchistiotdes very dis- 
tinct from the present new genus. 
Leontocaris paulsoni, n. sp 
Plate XXVI. 
Rostrum longer than the carapace behind it, reaching beyond 
the antennal scale, with eight strong teeth on the under margin, 
the first five closer together and more projecting than the rest ; 
on the upper margin are two small teeth close behind the acute 
apex, then at intervals come four conspicuous teeth, one of 
which is behind the eyes, and to the rear of this the carapace 
has two teeth in succession near the centre. The external 
angle of the orbit is acute, and below this a strong submarginal 
tooth commences a sublateral carina, that becomes feeble to the 
rear. The fronto-lateral angles are rounded. The partial 
carina of the third pleon segment is produced over the hind 
margin into a tooth slightly curved downwards. The rounded 
postero-lateral lobes of the fifth pleon segment are produced 
above into a small tooth. The telson is longer than the third 
pleon segment, narrow, tapering, with seven pairs of lateral 
