IHK» >SI!I 



( HISIHMA : 



tentacles (D :i , R 3 ) to the inner circle, a new small tentacle appearing 

 close to each of the five medium-sized ones, in paired radii dorsally 

 to, and in the rhidventral radius to the right of, the old small 

 tentacle (V 2 or L 2 ). 



The anterior part of radial calcareous segments shows some 

 features different from those of the preceding species. A deep 

 indentation divides the anterior edge into two/ unequal or asym- 

 metrical halves much as in Ps. africanus (textfig. 2). The two 

 halves have obliquely slanting edge and each of them shows a slight 

 notch. On the larger half, close to the deep median indentation, 

 there is again another small notch (textfig. 3, a). 



It can be plainly made out from sections that each tentacle is 

 supplied with the five tentacular canals branching from the radial 

 canal in an alternate arrangement. Aside from the presence of a 

 fifth distalmost branch in each radius, the tentacular canals arise in a 

 way similar to that in the twenty-tentacled species mentioned above. 

 The small distalmost branch, which communicates with the fifth 

 small tentacle, arises, in paired radii dorsally from, and in midventral 

 radius to the right of, each radial canal. The smallest notch on the 

 larger half of the divided margin of each radial calcareous segment 

 stands in relation with the small distalmost tentacular canal just 

 referred to (textfig. 2, D :i and R ;i ). 



2. Observations on previous records 

 regarding tentaculation. 



The size and arrangement of tentacles in Pscitdocitcumis acicula 

 (SEMPER), Ps. africanus, Ps. japonicus, PhyllopJionis dearmattts 

 DENDY & HlNDLE and P/i. holotJmrioidcs LUDWIG have been 

 diagrammatically figured by previous authors, as LUDWIG [20. Taf, 

 VI., Figg. 17,23; 24, Taf. XV., Fig. 16; and 26, P- 96, Fi gg- Ir - 

 12], Bedford [4. p. 844, figs. I— III], and Dendy & Hindle [9, p. 

 104, fi^. A]. But none of them have given an account of the 



