137 



more strongly curved upwards and projecting nearly always a little beyond 

 the antennal scales. In the first description of 1894 the carapace is described as being "dor- 

 sally carinated in rather more than its outer half", i.e. its anterior half; this is indeed often the 

 case in these specimens, the i^' tooth, i.e. the dorsal carina, commencing just behind the 

 middle of the carapace, while in the figure of the "Illustrations" this tooth stands a little more 

 forward. According to Prof. Alcock's description of 1901 the dorsal serrations of the rostrum are 

 8 or 9 in number, the ventral from 3 to 5. Among twenty seven specimens, in which the 

 rostrum is well-preserved, in sixteen the dorsal serrations number 7, in seven 8, in six 3 and 

 in the young specimen from Stat. 5, which is the youngest of all and 22 mm. long from apex 

 of rostrum to end of telson, even 9 teeth are observed; in this young specimen the i*' tooth 

 stands a litde anterior to the middle of the carapace, while the distance between the foremost 

 tooth and the tip of the rostrum measures almost one-third the length of the rostrum proper. 

 While in the species living on the coasts of India the usual number of dorsal teeth is 8 or 9, 

 in the form, occurring in the Indian Archipelago, it is usually 7, more rarely 8, while 6 teeth 

 are observed rather exceptionally. Almost constantly four teeth stand on the carapace behind 

 the limit of the orbit ; in an ova-bearing female from Stat. 3 1 6 only 3 teeth stand on the 

 carapace, the 4''' just before the orbital margin and the same is observed in one of the two 

 young individuals collected at this Station. \"entrally the rostrum is armed in these specimens 

 with 4 — 7 teeth, the usual number being 5; in an adult female without eggs from Stat. 314, 

 in which the carapace is 13,5 mm. long and the rostrum, measured horizontally, 12,5 mm., 

 only 3 well-developed teeth occur on the posterior half of the margin, of which the 2"'' stands 

 just before the anterior of the 6 teeth of the upper border and the 3'''^ opjjosite the apex of 

 the antennal scale; one observes, however, a 4"^ rudimentary tooth not far from the extremity. 

 The rostrum of the egg-laden female from Stat. 262 is f-dentate, the 5'*^ tooth of the lower 

 margin is the largest of all and the three following rapidly decrease in size; there is still another 

 specimen with 8 teeth on the lower margin, namely an ova-bearing female from Stat. 314, but 

 the anterior tooth is rudimentary. For the rest in most specimens one or two anterior teeth of 

 the lower margin are rudimentary. 



In the young specimens from the Ceram Sea the i'*' dorsal tooth stands on the middle 

 of the carapace. This is also the case in the adult male from Stat. 212; the rostrum is here 

 f-dentate, less strongly upcurved than in the other specimens, but reaching beyond the antennal 

 scales. In the specimens from the Stations 262, 314 and 316 the dorsal carina extends to 

 behind the middle of the carapace. 



In an adult, egg-laden female from Stat. 316, in which the carapace is 14,5 mm. long, 

 the left leg of the 2°*^ pair reaches by the chela and three-fifths of the carpus beyond the 

 antennal scale; the right leg of this pair extends nearly as far forward, but the less slender 

 carpus is one-third shorter than the carpus of its fellow. The leg of the 3''^ pair is the longest 

 of all and reaches still a little beyond those of the 2""* pair, projecting by the dactylus, the 

 propodus and half the carpus beyond the antennal scale. The 4"' and the s"' gradually decrease 

 in length, so that the 5"' legs reach only by the dactylus and three-fifths of the propodus 

 beyond the antennal .scale. 



SIBOGA-KXI'EUITIK. ,\XXlX<i'. '8 



