107 



than between this ridge and the lateral borders. The fingers, which are somewhat shorter than 

 die palm, shut close together and their pointed tips are crossing one another; both fingers are 

 somewhat flattened and gradually narrow towards the tij). The immobile finger is armed with 

 a larger, subacute, compressed tooth, situated a little nearer to the articulation than to the tip 

 of the finger and furthermore along its whole length to near the extremity with numerous 

 much smaller teeth of different size, larger teeth alternating with smaller ones ; similar small 

 teeth of different size occur also along the whole length of the dactylus, but 5 or 6 proximal 

 ones are larger than the rest. In the male of Nephr. Thomsoni there is a spine near the centre 

 of the inner margin of the palm, but in Nephr. Sibogae, like also in the female of Nephr. 

 Challengeri, this spine is wanting. The i st pair of legs of younger male specimens agree with 

 those of the adult male just described, but the granulation is less conspicuous. In a young 

 male, long 116 mm., the carpus of the right cheliped carries a spine at the proximal third 

 of its inner margin, an abnormality indeed. 



Of the female the i st pair of legs agree with those of the male. In the largest female, 

 that measures 178 mm., the 'left leg is 166 mm. long, ahnost as long as the body, the right 

 is somewhat shorter; the chela measures 94 mm., the palm is 50 mm. long and 13 mm. broad 

 at the articulation of the fingers. In another female, also without eggs and measuring 165 mm., 

 the carapace is 49 mm. long without the rostrum and yy mm., when it is included : in this 

 specimen the i st pair of legs are considerably smaller than in the female long 178 mm., the 

 right leg measuring 122 mm., the other 11 1 mm. In this specimen, like in the young male, 

 long 116 mm., the carpus of both legs is armed with a sharp tooth at the proximal third of 

 its inner margin and the carpus of the left leg carries 2 spines instead of one, as usually, 

 near the proximal end of the outer margin. In the two egg-laden females, finally, which are 

 135 mm. and 128 mm. long, the accidental spine on the inner margin of the carpus occurs 

 on the right leg, but not on the left. In the female of Nephrops Challengcri (C. Spence Bate, 

 1. c, p. 191, PI. XXV, fig. 2) "a small sharp tooth is present at the external base of the 

 dactylos", this tooth now is wanting in Nephr. Sibogae, both in the male and in the female. 

 In the adult male, long 1S4 mm., a small sharp tooth is observed at the base of the dactylus, 

 not externally, but both on its upper and on its lower side ; immediately behind these teeth another 

 similar tooth occurs on the distal end of the palm. When the dactylus is now looked at from 

 the inner side, one observes therefore, at each side of the articulation, two small sharp teeth 

 which are directed forward ; in younger specimens these teeth are rudimentary or wanting at all. 



The other legs apparently agree with those of Nephr. Thomsoni. In the adult male 

 the 2 nd pair extends as far forward as the carpus of the i st , the 4 th pair reaches nearly as 

 far, but the legs of the 3 rd pair are distinctly shorter and those of the 5* attain only the distal 

 extremity of the merus. 



The elobular eafsrs show a diameter of 2 — 2,1 mm. 



3. Nephrops arafurensis de Man. (Plate III, Fig. 16, \6d). 



Nephrops arafurensis J. G. de Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. IX, Afl. 3, 

 1905, p. 587. 



