193 



LIST OF THE SPECIES OF NIKOIDES Paulson, KNOWN AT PRESENT. 



SPECIES 



HABITAT 



DEPTH IN FATHOMS 



Danae Paulson 1875 



maldivensis Borr. 191 5. 



pontica Sowinsky 1882. 

 Sibogae de Man 191 8 . 



Red Sea 



Djibouti 



Perim 



Kamaran Islands 



Maldive Islands 



Amirante Islands 



Black Sea 



Makassar 



2,3 miles N. 63° W. from the North-point of Nuhu Jaan, Kei-islands 



East coast of Aru-islands 



Between Nusa Besi and the N.E.-point of Timor 



II 



Up to 17 



31 

 15—30 



I. Nikoides Sibogae de Man. PI. X\T, Fig. 50 — 507. 



Nikoides Sibogae J. G. de Man, in: Zoologische Mededeelingen, uitgegeven vanwege 's Rijks 

 Museum van Natuurlijke Historic te Leiden. 191 8, Deel IV, Afl. 3, p. 160. 



Stat. 71. May 10— June 7. Makassar and Surroundings. Up to 32 m. Bottom mud. Sand 



with mud. i young specimen. 

 Stat. 260. Dec. 16 and 18. 5° 36'.$ S., I32°55'.2E. 90 m. 2,3 miles N. 63°W. from the North 



point of Nuhu Jaan, Kei-islands. Bottom sand, coral and shells, i full-grown, 



ova-bearing female, wrapped in a felt-like tube. 

 Stat. 274. Dec. 26. 5°28'.2S., i34°53'.9E. East coast of Aru-islands. 57 m. 2 females 



without eggs. 

 Stat. 282. January 15/17, 1900. 8°25'.2S., i27°i8'.4E. Anchorage between Nusa Besi and 



the N.E.-point of Timor. 27 — 54 m. Bottom sand, coral and Lithothamnion. 



I young specimen. 



This new species is closely related to Xikoides Danae Paulson, of which Nobh.1 has given 

 a detailed description in 1906 (in: Annal. Scienc. Nat., 9^ Serie, Zool., T. IV, p. 79, PI. 5, 

 fig. I — I /) : it differs evidently by the different form of the rostrum and of the 

 s i mp 1 e leg of the i ^' p a i r ^). 



The largest of the 5 specimens, which is considered as the type, is the ova-bearing 

 female from Stat. 260, that measures 42 mm. from tip of rostrum to tip of telson. The carapace, 

 rostrum included, is 13,3 mm. long and without the rostrum 10,2 mm.; it is 5,5 mm. high, 

 appears therefore nearly twice as long as high and half as long as the abdomen. The slender 

 rostrum, which in the younger female from Stat. 274 appears as long, but in the other specimens 

 (Fig. 50 (5, 50^) a little shorter than the eyes and which in the ova-bearing female measures about 

 one-third the rest of the carapace, projects horizontally forward in a line with the straight upper 

 border of the carapace, though the tip appears in the largest specimens slightly curved down- 

 ward; the rostrum is compressed, the lower border, in a lateral view slightly conve.x 



l) The description of Nikoides pontica Sowinsky in the "Memoires Soc. Sciences Kieff, 1882", could not be consulted, because 

 these memoirs are not found in any library of Holland, as far as 1 am aware. 



!j3. • 25 



SIBOGA-EXPEDITIE XXXI.Xaf 



