1908] : Decapod Crustaceans. 13 
3rd, 4th and 5th Pleopods. It is only the inner branch 
of the 2nd pleopod of males which is provided with two appendices. 
The following 3 pleopods, as in the case also of the 2nd pleopod 
of females, have merely a single one, viz: appendix interna. [Ple- 
opods 3—5 moreover resemble both in size and structure the second 
pair of pleopods|. 
Caudal Fan (Rhipidura) (fig. 5, VIL). Telson about the same 
length as the posterior abdominal segment, rectangular, obtusely 
produced in its posterior margin. In the middle of the posterior 
margin we find a little spine, besides å number of very short spine- 
like, and å few rather longer smooth setae, and also åa dense row 
of long plume-like multarticulate') setae. Laterally also some quite 
small spines are to be found. 
Å narrow longitudinal central groove extends from the middle 
of the telson's posterior margin to well beyond the telson's centre. 
On each side of this groove is to be found å carina diverging from 
the central point of the telson's anterior portion towards the outer 
corners and carrying å few groups of thin acute spinules, which are 
probably imperfectly developed setae, or possibly even broken stumps 
of setae. 
The outer of the two caudal plates is slightly longer than 
the inner. The latter has å raised median carina with 3—4 groups 
of acute spinules: while the outer has å pair of low broader carinae 
without spines, as well as å row of acute spinules along the suture 
(ds) between the outer and the inner portion of the lamella. Like 
the telson the lamellae are furnished along the margins with long 
plumose setae, and small spine-like setae, and also åa few longish 
smooth eiliated setae. 
Systematic Discussion. 
Ås Trysom has already pointed out (loc. eit.) Calocarides cras- 
sipes approximates very closely to Calocarides coronatus, to which 
it bears a near general resemblance and with which it accords in 
size, in the structure of carapace and abdominal segments, and in 
the relative lengths of the segments, &e. 
1) See Tryrom: loe. cit. 
