2 TO 



Proportion between the Ienj;lli of the 

 rostrum and that of the rest of the 

 carapace j.S 



Number of pairs of rostral teeth ... 2 



Rostral teeth large 



5,8 



2 



small : small 



4,< 



' 4,6 



2 



of 



moderate 



size 



micr. I micr. micr. micr. micr. I micr. 



3,7 

 3,« 



small 



small 



large 

 1 slightly 



Anterior gastric spine micr.i)j larger 



I than N"! 



N»i-3 Stat. 45; X"4 and 5 Stat. 88; X" 6 Stat. 178; X« 7 Stat. 2 1, ; X" 8 Stat ^oo- 

 N" 9—14 Stat. 316. ■ ■ 



2. Potitophilus viodumanuejisis Rathb. PL XXI and XXII, Fig. 64—64/. 



Pontophilus viodmnanuensis M. J. Rathbun, in: U.S. Fish Commission Bull, for igoi! Part III 

 Uash. 1906, p. 910, textfigurc 63. 



Stat. 89. June 21. Pulu Kaniungan Ketjil. ,. m. Bottom coral. 2 adult, ova-bearing females 

 Stat. 297. January 27, .900. .o°39S., .23040- E. South-east of Rotti island. 520 m. Bottom 

 soft, grey mud with brou-n upper layer, i adult, ova-bearing female. 



The present specimens are referred with some doubt to this species. Accordin^r to the 

 description the antennal peduncle should reach to the middle of the second antennular article 

 in our specimens, however, the slender peduncle reaches considerably beyond the anten- 

 nular peduncle, either to the distal fourth of the antennal scale (the specimen from Stat -^^-j) 

 or to the distal third, in the two others. The te.xtfigure in Miss Rathbun's description is no doubt 

 inaccurate and incomplete. The median carina, that stops short of the posterior marcWn of the 

 carapace, is wanting in that figure. According to the description the slender rostrun^is armed 

 on Its basal half with two spines on each side: in the figure the margins of the rostrum are 

 smooth, unarmed, while the two spines that are situated more backward behind the eyes 

 represent no doubt the acute angle of the notch on the orbital margin between rostrum and 

 orbital spine and the microscopical spinule that one observes a little behind that notch, thouah 

 in this case, these spinulcs appear in the figure much too large. Distinct lateral carinae as are 

 visible in the figure, are in the adult specimens not developed; furthermore the carapace itself 

 and the antennal scale appear in the figure less broad in proportion to their len.nh than in 

 the specimens collected by the "Siboga", but the two last named differences mav probably be 

 attributed to the young age of the Hawaiian type. 



Though the three Siboga specimens are all ova-bearing, the female from Stat ->97 has 

 a smaller size than the two from Stat. 89, but it is still more remarkable that this smaller 

 specimen accords better with Miss R..tm.ux's description than the two females from Pulu 

 Kaniungan Ketjil. 



The female from Stat. 297 is 21 mm. long from tip of rostrum to tip of telson. measured m 

 the middle line, carapace 6 mm., abdomen 1 5 mm. ; the carapace is almost half as broad (3 2 mm ) 

 as long. The acute rostrum (Fig. 64, 64^) that reaches as far forward as the eyes, measures just 



1) "Micr." signifies "microscopical", only perceptible by means of the microscope. 



2) 'A signifies that it measures one-third the length of the posterior gastric spine. 



