121 



echinus uariegatiis or Ps. uerruculatiis; to which of these two species they helong 

 can scarcely be decided, especially as the locality, from where they have come, is 

 unknown. 



Siibfam. Parasaleninæ. 

 16. Parasalenia gratiosa A. Ag. 



PI. V. Fig. 36. 



Parasalenia gratiosa. A. Agassiz. 1863. List of Echinoderms etc. Bull. Mus. Comp. Zool. I p. 22. 

 Echinomelra Arbacia. LCtken. 1864. Bidrag til Kundskab om Echiniderne. p. 92 (160). 

 Parasalenia gratiosa. Agassiz. 1872. Revision of Echini, p. 148, 435. 



— — Stewart. 1880. On some structural features of Echinostrephus molaris, Parasa- 



lenia gratiosa and Stomopneustes variolaris. Journ. R. Microsc. Soc. III. p. 909. 

 PI. XX. 



— — Pfeefer. 1887. Über Parasalenia gratiosa (A. Ag.) u. P. Pöhlii n. sp. Verhandl. 



d. Vereins f. naturw. Unterhaltung. Hamburg. VI. p. 107. 



— Pöbln. Pfeffer. Ibidem. 



— gratiosa. Meissner. 1892. Über Parasalenia gratiosa von Madagascar. Sitz. ber. Ges. naturf. 



Fr. Berlin. 1892. 



— — Sluiter. 1895. Die Echiniden Sammlung des Museums z. Amsterdam, p. 69. 



— — Mortensen. 1903. „Ingolf" -Echinoidea. I. p. 127. PI. XXI. Fig. 32. 



— — DE Meijere. 1904. „Siboga'-Echinoidea. p. 97. Taf. XVII. Fig. 290. 



Non: Parasalenia gratiosa. Bell. 1903. Report on a Collection of Echinoderms 

 from the Neighbourhood of Zanzibar. I. Ann. Nat. Hist. 7. Ser. XII. p. 247. 

 (Stomopneustes variolaris.) 



A few additional remarks may be given on this otherwise well known 

 species. — The globiferous pedicellaria? contain numerous bihamate spicules; the 

 skin on the upper end of the stalk is swollen, forming a gradual passage from the 

 thin lower part to the head. This swelling might seem to be due to mucous 

 glands, but according to de Meijere there are no glands on the stalk. (The valves 

 have been figured by Stewart.) It is a curious fact that the globiferous pedicel- 

 lariæ are often totally wanting. In none of my specimens have I found them. 

 The tridentate pedicellariæ (PI. V. Fig. 36) are very slender and elongate, the head 

 attaining sometimes even a length of more than 2 mm.; the valves join in the 

 outer half of their length. Also quite small tridentate pedicellariæ are found, with 

 simply leafshaped blades. The sphæridiæ are of usual form and smooth. — No 

 spicules are found in the walls of the intestine or genital organs. 



4 specimens of this beautiful little Echinid were taken in old Coral blocks 

 in about 1 fathoms depth at Koh Chang and the little Island Koh Sarlak in the 

 Sound between Koh Chang and the mainland. 



DE Meijere has shown that Parasalenia Pöhlii cannot be distinguished from 

 P. gratiosa by the characters pointed out as distinctive in the original diagnosis by 



D. K. D Vidensk. Selsk. Skr.. 7. Række, naturvidensk. og raalhem. Afd 1. 1 16 



