94 ZOOLOGISCHE MEDEDEELINGEN — DEEL VI. 



mistake indeed. In this false supposition of the notch presenting the same 

 form in Scyll. arctus and Scyll. bicuspidatus the key of 1916 was drawn 

 up by me. 



The shape that the notch shows in the youngest specimen, long 

 34 mm., must, no doubt, be considered as a juvenile feature. Scyll. bicus- 

 pidatus will perhaps once prove to be founded on a young specimen, in 

 which the sternal notch is also still shallow, but this species differs from 

 Scyll. arctus at first sight by the carapace bearing only two teeth in 

 front of the cervical groove: in this connection it is to be regretted that 

 the length of the only type specimen of Scyll. pumilus has not been 

 mentioned by Dr. Nobili. 



Enoplomctopus longirostris de Man. 



Enoplometopus longirostris J. Gr. de Man, in: Archiv für Naturge- 

 schichte, 53. Jahrg. 1888, p. 488, PI. XXI, fig. 4. 



1 specimen collected march 30/31, 1899, by the Siboga Expedition 

 at Sailus Ketjil, Paternoster-islands, at the surface in the Plankton 

 (Stat. 37). 



1 specimen collected december 4/5, 1899, by the Siboga Expe- 

 dition at the anchorage off Rumah Lusi, North-point of Tiur-island 

 (Stat. 248). 



The examination of the abdomen of these specimens and of a cotype 

 from Amboina, preserved in my private collection, revealed the remar- 

 kable facts 1° that the 1st somite is destitute of appendages, 

 2° that the pleopods of the 2nd — 5th somite bear all a 

 well-developed appendix interna or stylamblys, of which 

 the tip is provided with a cluster of normal cincinnuli. 

 As far as I know in all the Nephropsidae the 1st abdominal somite bears 

 a pair of uniramous appendages, while the pleopods of the four following 

 somites are destitute of an appendix interna (A. Alcock, A descriptive 

 Catalogue Indian Deep-Sea Crustacea, Calcutta 1901, p. 150 and L. A. 

 Borradaile, in : Annals Mag. Nat. History. Ser. 7, vol. XIX, 1907, p. 473). 

 I did not succeed in detecting the genital openings in one of the 3 specimens, 

 that are of equal size, 23 mm. long. 



According to Alcock (1. c. p. 9) in the Macrura Astacides the antennal 

 scale, if foiiaceous, should not conceal the terminal joint of the antennal 

 peduncle entirely. In a young female of Enopl. occidentalis (Randall) 

 from Amboina, belonging to my private collection and described by me 

 1. c. 1888, the antennal peduncle is not entirely concealed by the antennal 

 scale, projecting a little beyond it, but in Enopl. longirostris the antennal 



