33 



the spines of the upper and all the spines apparently articulate with the rostrum. Four spines 

 are placed behind the orbit, the i 5t is a little smaller than the three following, its distan ce from 

 the 2 nd is just as long as that between the 2 nd and the 3 rd , but the 3 ld is twice as far distant 

 from the 4" 1 as from the 2 nd ; the 5 th spine is twice as far distant from the 4 th as the 4 th from 

 the 3 rd and the intervals between the 4 th and the 5 th , the 5 th and the 6 ,h and the 6 th and the 

 7 ,h are equal. The S th spine is a little longer than the 7 th and implanted close to it, then 

 follows again a longer interval, for the 9 th spine is one and one-third as far distant from the 

 8 th as the 7 th from the 6 th ; the distance between the io th and the 9 th is little more than one- 

 third of the distance between the o th and the 8 th , but the 1 i th spine, a little smaller than the 

 preceding and than the following, is as far distant from the io th as the 9 th from the 8 th ; the 

 intervals between the four distal teeth are subequal, the distance between the two middle ones 

 beino- a little larger than the distances between the ii th and 12" 1 and between the i3 th and 

 i4 th spine, while the ii th spine is as far distant from the i4 th as from the io th . The anterior 

 spine, finally, is twice as far distant from the apex of the rostrum as the 1 2 th spine from the 

 1 V h - The posterior spine of the lower margin is implanted opposite the 7 th of the upper and 

 the distances between the following gradually increase in length ; the 2 nd spine is placed a little 

 before the 8 th of the upper margin, the 3 rd just before the 9 th , the 4 th midway between the io ,h 

 and the ii th , while the foremost spine is placed opposite the penultimate of the upper margin. 



The carapace which is almost as high as long when measured dorsally, appears rather 

 flattened above, especially the cardiac region, and the rostrum does not arise with a carina. 

 Cervical groove shallow though distinct. Supraorbital spine situated a little below the 4 lh spine 

 of the upper margin of the rostrum and reaching just beyond the orbital margin ; outer orbital 

 angle obtuse-, the antennal spine that one observes close to and just below the outer orbital 

 angle, is a little smaller than the supraorbital spine, there is, finally, a third spine directed 

 forward and slightly downward at the antero-inferior angle of the carapace. Hepatic groove 

 short, but continuing as a shallow groove towards the antero-inferior angle of the carapace. 

 Orbital furrow rather indistinct. Lower border of carapace with feathered setae. 



Apart from the characteristic spinulation of the pleura (Fig. gó) and perhaps also from 

 the shape of the telson, the abdomen closely resembles that of Stylod. bimaxillaris Bate: I say 

 perhaps, because the telson of this species has not yet been figured, while the description is 

 rather incomplete. The abdomen is 11,7 mm. long, 4-times as long as the carapace without 

 the rostrum and nearly one-third longer than carapace and rostrum taken together. The abdomen 

 is not compressed, so that the i st and 2 nd terga and the anterior half of the 3 rd are more or 

 less flattened, while the terga of the 4" 1 , 5 lh and 6 th somite are rounded. The upper border of 

 the 3 rd tergum which in the young specimen from Ternate (J. G. de Man, 1. c. Fig. 64 tf) runs 

 almost straight, appears in the adult specimen distinctly convex, like in Stylod. bimaxillaris. 

 The 4 th tergum, long 1,08 mm., appears, like in this species, about half as long as the 3 rd , 

 the upper border of the 5 th is a little more than half as long (0,62 mm.) as the 4 th , the 6 th 

 tergum, finally, 1,76 mm. long, is a little more than one and a half as long as the 4 th and 

 3-times as long as the 5 th , while the telson, about as long as the two preceding terga combined, 

 is one and a half as long as the 6 th somite. The general arrangement of the small spines or 



SIBOGA-EXPEDIT1E XXXIX a 3 . 5 



F Ia, 



