102 



agree with those of the male from the Bali Sea, though I must remark that these legs do not 

 much dififer in the two species. Other differences between Nephr. japonicus and Nephr. anda- 

 manicus are the following. The rostrum of the japanese species is probably a little longer, 

 especially in the female, a difference already mentioned by Ortmann (1. c). In the adult male 

 of Nephr. japonicus, lying before me, the rostrum appears to be jj l / a mm. long until the 

 frontal margin, while the distance between this margin and the posterior border, i. e. the 

 length of the carapace, measures 60 mm.; in the male of Nephr. anda/uanicus from the Bali 

 Sea these numbers are respectively 24 mm. and 43 mm. In the female of A T ephr. japonicus 

 they are 34 mm. and 51 mm., the rostrum appears here comparatively longer and reaches 

 also a little farther forward. The lateral outstanding carinae on the gastric region are armed, 

 on each side, in Nephr. andamaniciis only with three spines (PI. III, fig. 15); the foremost is 

 much larger than the two followingf and the third is a little smaller than the 2 nd , while the 

 more slender spine on the lateral margins of the rostrum has a length intermediate between 

 that of the 2 nd and 3 rd spine of the lateral carinae. The three spines are all slightly directed 

 outward. The two carinae run parallel, though we must observe that the distance (9'/, mm.) 

 between the spines of the 2 nd pair is a little larger than the distance (8 mm.) between those 

 of the 3 ,d and even a little more than the distance (9 mm.) between the spines of the i st pair. 



In Nephr. japonicus on the contrary the lateral carinae on the gastric region carry on 

 each side five or six spines, that also decrease in length backward. In this species also the 

 foremost spine is much larger than the following, but it has another form. In Nephr. anda- 

 manicus this spine is directed obliquely upward and slightly outward, the upper 

 margin is straight and the spine reaches hardly beyond the middle of the eyes; in Nephr. 

 japonicus, however, the spines of the foremost pair reach the distal end of the eye-peduncles 

 and extend to the base of the lateral spines of the rostrum, they are much slenderer, 

 more acuminate and distinctly directed inward and downward, while their upper border 

 is regularly curved. 



Though the legs of the i st pair show nearly the same form and characters in both 

 species, they appear, however, still more spinulose in Nephr. japonicus. 



General distribution: Andaman Sea. 



2. Ncphrops Sioogae n. sp. (PI. IV, Fig. iS — \Sd). 



Stat. 254. Dec. 10. 5°40'S., I32°26'E. 310111. Bottom fine, grey mud. 5 males and 4 females, 

 2 of which are ova-bearing. 



It was Dr. H. Balss of Munich who in 1914 has first pointed out that the male and 

 the females of Nephr. Thomsoni, described by Spence Bate in his work on the "Challenger" 

 Macrura, of which the male was taken off Tablas Island, while the two female specimens had 

 been captured between Australia and New Zealand, in fact belong to two different species, so 

 that for the latter the name of Nephr. Challengeri was proposed by him (H. Balss, Ostasia- 

 tische Decapoden II, München, 19 14, p. 84). The characters by which the new species, discovered 

 by the "Siboga", differs from Nephr. Thomsoni and Nephr. Challengeri, are intermediate 



