irtion between the lenglh of the 

 rostrum and that of tlie rest of the 

 carapace 



Number of pairs of rostral teeth . . . 



5,8 



2 



Rostral teeth ' large 



5,8 



2 



6 



! 2 



5,7 5 



2 2 



6,2 5,1 



2 2 



large ' small 

 i slightly j 



Anterior gastric spine 'mier.') larger mier. 



than N"i 1 



large lavge 

 l/ 3 -; mier. 



large 



large 



laree 



4,7 

 2 



small 



N° i — 3 Stat. 45; X" 4 and 5 Stat. 88; N° 6 Stat. 178; X u 7 Stat. 211 ; N° 8 Stat. 300 ; 

 N° 9 — 14 Stat. 316. 



2. Pontophilus modumanuensis Rathb. PI. XXI and XXII, Fig. 64 — 64/. 



Pontophilus modumanuensis M. J. Rathbun, in: U.S. Fish Commission Buil. fo 1-1903, Part III, 

 Wash. 1906, p. 910, textfigure 63. 



Stat. 89. June 21. Pulu Kaniungan Ketjil. 11 m. Bottom coral. 2 adult, ova-bearing females. 

 Stat. 297. January 27, 1900. io°39'S., i23°4o'E. South-east of Rotti island. 520 m. Bottom 

 soft, grey mud vvith brown upper layer. 1 adult, ova-bearing female. 



The present specimens are referred with some doubt to this species. According 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. 297) 

 or to the distal third, in the two others. The textfigure in Miss Rathbun's description is 110 doubt 

 inaccurate and incomplete. The meclian carina, that stops short of the posterior margin of the 

 carapace, is wanting in that figure. According to the description the slender rostrum 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, though, 

 in this case, these spinules 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 length than in 

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

 attributed to the young age of the Hawaiian type. 



Though the three Siboga specimens are all ova-bearing, the female from Stat. 297 bas 

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

 specimen accords better with Miss Rathbun'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 oftelson, measured in 

 the middle line, carapace 6 mm., abdomen 15 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) "Mier." signifies "microscopical", only perceptible by means of the microscope. 



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



