o22 I'UOCi;KDIN(i.S OF THE ACADEMY OF [1890. 



Koellikeri and //. teiiuissima, by an nnequal instead of an equal dis- 

 tribution of papilhie over the surface of the body, and from H. de- 

 mens by the absence of the fifteen small papilke which surround the 

 anus of the latter species. 



These distuictions are given for the sake of convenience. Many 

 minor ones exist, but the difficulty, even with the characters given 

 above, is toestimatetheir real value. It is possible that a larger amount 

 of material may in the future enable us to unite these forms as varie- 

 ties of one or a few species. The existence of the three rudimentary 

 tables, j^reviously mentioned, even suggests a relationship to Holo- 

 thvria afra and its allies. 



This species I have named after the Port of Silam where it was 

 collected. 



Holothuria nitida, n. sji. I'l. Vril. figs. 10-15. 



Body cylindrical. Specimen collected, in a moderately extended 

 condition, four times as long as broad, slightly acuminate at both 

 ends. Surface of the body smooth. Pedicels and papilla on the 

 dorsal surfoce and pedicels alone on the ventral surface. 



Dorsal pedicels not very numerous, smaller than the ventral. 

 Containing well developed tables, of the type found in Holothuria 

 atra, around the edge of the terminal disks, and also rosettes. 

 Tables about "1 mm. in height, and their disks about "09 mm. 

 in diameter. A very few imperfect tables (see PI. VIII, fig. 

 11.) also occur around the edge of the disks. Rosettes usually with 

 a longer and shorter diameter, the former being on an average 

 •03 mm. and the latter '02 mm. Some very much larger rosettes of 

 abnormal form are found in the pedicels, PI. VIII, fig. 15. The 

 ventral pedicels lack deposits in their walls but possess well devel- 

 oped terminal disks. They are arranged in three imperfect longi- 

 tudinal rows, the two outer having a width of three or four ped- 

 icels, and the inner of four or five. The papillae are arranged in a 

 row of about seven in number along the lower edge of the dorsal 

 surface, on either side, and in two longitudinal rows upon the in- 

 tervening portion. They contain many rib-like rods with branched 

 or perforated extremities. Tables and rosettes also are sometimes 

 present. The deposits of the body-wall are few and consist entirely 

 of rosettes which usually occur in very small and scattered groups. 

 The branches of the rosettes occasionally coalesce, forming imper- 

 fect perforated plates. 



