114 
peraeopods. These gradations seem to negative what might 
otherwise be a natural suggestion that in the fourth peraeopods 
not a loss but a coalescence of joints may have occurred. The 
rounded apex of the telson is transparent. 
Length, about 11 mm. in both sexes. Two of the specimens 
carried eggs, in one example the two longitudinal packets being 
easily separable. 
Locality—Ten miles off Cape St. Blaize, in 40 fathoms, 
“where fish were plentiful.” 
The specimens from which Sars drew his elaborate illustra- 
tions reached a length of 17mm. ‘“‘in the male sex, in the 
female somewhat less.” After mentioning the localities from 
which they were obtained, he says :—‘* The species would 
accordingly appear to be wholly confined within the limits of 
the Australian Seas.’ The South African specimens do not, 
however, appear to differ in any material respect except size. 
Sars states that the first two pleon segments have the posterior 
margin slightly produced in the middle. This production I 
cannot perceive. The sixth segment has the produced point 
which Sars figures, but does not mention. 
Fam. Mysidae. 
1885. Mysidae, Sars, Challenger Schizopoda, Reports, Vol. 
NILE pp en 072s 
1887. Mysidae, Hansen, Vid. Medd. Kj6benhavn, p. 209. 
1892. Mysidae, Norman, Ann. Nat. Hist., Ser. 6, Vol. X., p. 143. 
1893. Mysidae, Stebbing, History of Crustacea, p. 266. 
1893. Mystdae, Ortmann, Decap. und Schizop. Plankton-Exp., 
Ds Qi. “ 
Ortmann supplies a synoptic view of nineteen of the genera 
included in this family, defining for the first time Chlamy- 
dopleon and Caesaromysis. 
Gen. Caesaromysis, Ortmann. 
1893. Caesaromysis, Ortmann, Decap. und Schizop. Plankton- 
Exp.; pp> 22) 24: 
Ortmann gives a definition to the following effect :— 
Body plump, spinose. Cephalothorax not completely cover- 
ing the thorax behind, the rostrum produced, spiniform. 
Marsupium of the female formed of two pairs of lamellae. 
