5* 



In the young female from Enoplom. occidentalis (Randall) from Amboina the anterior 

 margin of the i st antennal segment is armed at the inner side of the tubercle, hearing the 

 opening of the antennal gland, with a spine that is directed forward and slightly invvard : in 

 Enoplom. longirostris this spine is wanting. 



The examination of the abdomen revealed the remarkable fact i° that the i st somite 

 is destitute of appendages, 2 n that the pleopods of the 2 nd , 3 rd , 4 th and 5 th 

 somites bear all a w e 1 1 - d e v e 1 o p e d appendix interna or stylamblys of which the 

 tip is provided with a cluster of cincinnuli. As far as I know in all the Nephropsidae 

 the i st abdominal somite should bear a pair of uniramous appendages, while the pleopods of 

 the four following somites should be destitute of an appendix interna, (A. Alcock, A descr. 

 Catal. Indian Deep-Sea Crustacea, Calcutta 1901, p. 150, also L. A. Borradaile, in: Annals 

 and Mag. Nat. Hist., Ser. 7, Vol. XIX, 1907, p. 473). I did not succeed in detecting genital 

 apertures in one of the three specimens lying before me. The sternum of the i st abdominal 

 somite is quite smooth. In the specimen from Stat. 37 the two branches of the 2 nd pleopod 

 (Fig. 20) are subequal in length and width, the endopodite bears just behind the proximal 

 third of the inner border a stylamblys which is 0,54 mm. long, being a little shorter than half 

 the length (1,32 mm.) of the branch ; the stylamblys is slender, 13- or 14-times as long as 

 wide and there is a cluster of cincinnuli (Fig. 20 a) at the tip. In the 3 rd pleopod the stylamblys 

 (Fig. 20 b) is implanted at the posterior fourth, it shows the same length as that of the 2 nd , 

 but it is considerably thicker, only 9-times as long as thick ; the 4 ,h pleopod fully agrees with 

 the 3 rd , while the 5 lh , that was not dissected, no doubt also agrees with it. 



According to Professor Alcock's cited work, p. 9, in the Macrura Astacides the antennal 

 scale, if foliaceous, should not conceal the terminal joint of the antennal peduncle entirely. In 

 the young female of Enoplom. occidentalis the antennal peduncle is not entirely concealed by 

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

 extends far beyond the antennal peduncle, which it conceals entirely. 



It appears to me quite probable that Enoplom. longirostris will once prove to be the 

 young of a still unknown species, because it differs too much from Enoplom. occidentalis or 

 pictns to be considered as a young of these two. 



