103 
Gen. Merhippolyte, Bae 
1888. Merhippolyte, Bate, Challenger Macrura, Reports, Vol. 
OCLs ORO- 
1893. Merhippolyte, Stebbing, History of Crustacea, pp. 234, 
220). 
1898. Merhippolyte, Ortmann, in Bronn’s Thierreich, Vole We 
Pt. 2, Lieferung 50. 
This genus appears to be well distinguished from others of 
the family by the combined characters of the mandibles and 
second peraeopods. The mandibles have a strong molar, a 
thin cutting edge, and a three-jointed palp; the fifth joint 
or wrist in the second peraeopods exhibits numerous sub- 
divisions. Bate’s Chorismus is said in the generic account to 
have a two-jointed palp to the mandible, but in the description 
and figure of the single species assigned to the genus the 
mandible is furnished with a three-jointed palp. The mandible 
of Chorismus, however, is very different from that of Mer- 
hippolyte, which has the three joints of the palp sub-equal, 
and the cutting edge quadridentate, whereas in the other 
genus the first joint of the palp is much shorter than the second 
or third, and the cutting edge is degraded to a single point. 
Moreover, the branchial formulae of the two genera are said 
to be quite distinct. 
Merhippolyte agulhasensis, Bate. 
1888. Merhippolyte agulhasensis, Bate, Challenger Macrura, 
Reports, Vol. XXIV., p. 619, Pik tno; ies" 4: 
The carapace has five medio-dorsal teeth, of which two are 
to the rear of the orbits; the teeth on the lower margin of 
the rostrum in our larger specimen are five in number, but 
six in the smaller one ; in both the tip of the rostrum is biden- 
tate, the lower point being the more advanced. This latter 
detail is not mentioned by Bate. In the first antennae the 
long tooth on the outer margin of the first joint has a small 
tooth at the base of its own outer margin. The broad scale 
of the second antennae, which has a rounded end projecting 
very little beyond the strong tooth at the lateral apex, does 
not in our specimens or even in his own illustration agree 
with Bate’s statement that it “‘ reaches as far as the extremity 
of the rostrum.” 
