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spines distinct, sometimes it is hardly visible. In m> case have 1 observed two large upper 



spines. In the notch, <>r il" it is absent at the place it occupies in other maxillae, three or tour 



short and delicate hairs are planted. Nexl follows a slightly protuberant par! with 5 <>r <> 



and then a second smaller notch. Hien about 8 pairs of spines and linally th<' 



dub prominent inferior angle with a brush of rather short spin< 



The outer maxillae have a smal! but distinct notch between the upper and lower 

 iup of sjiiii' 



Of the cirri the lirst pair is short; the general shape of the segments of this pair 

 is narrow ar the base and broader at the other extremity. The anterior ramus has 8 segments 

 on the right side and 12 on the left, the posterior 1 2 and 13 respectively. The segments ar<: 

 thickly paved with bristles, which are themselves coarsely and doubly serrated. 



The second cirrus has \- and 20 segments; the 8 basal segments of the anterior 

 ramus are highly protuberant and thickly clothed with spines; the posterior ramus has only 5 

 these basal segments and 15 upper segments with the usual structure. 



The third cirrus has ^j and 24 segments: six and live of these are highly protuberant 

 and thickly clothed with spines. 



The fourth cirrus has 2} segments in both rami and the front of the basal segments 

 not protuberant, as is the case in the three preceding pairs. 



The fifth cirrus has 25 — 26, the sixth 23 — 26 segments. 



The caudal appendages are long, reaching as far as the extremity of the eighth 

 ment of the anterior ramus of the sixth cirrus. The number of segments was 23. 

 The penis is short, thick at the base, distinctly ringed. 

 During the cruise of H.M. S. "Siboga" this species was observed at the following places: 



Station 221, ■. Reef near Lucipara islands; 8 — 10 November 1899. 17 specimens. 

 Station 250: Reef hear Kur island ito the W. of the Kei islands), December 6 — 7, 1899. 

 1 specimen. 



2. Lithotrya conica n. sp. PI. IX, fig. 10 — 12. 



Scutum large, indistinctly beaked and slightly overlapping the tergum ; tergum much 

 smaller than the scutum, their tips coming close together; carina triangular. strongly bowed 

 laterally, feebly bowed vertically; rostrum small, as wide as four (or less) of the subjacent scales; 

 latus having the shape of a parallelogram, its base as wide as four of the subjacent scales. 



Palpi with the tips rounded, conical ; mandibles with not very numerous pectinations 

 between the teeth : maxillae with the inferior angle hardly prominent; outer maxillae without 

 notch between upper and lower group of spines. 



The capitulum as a whole lias a conical shape, its rostral and carinal margins being 

 both nearly equally curved. The tip of the scutum reaches as far or slightly farther than that 

 of tlv tergum, the tip of the carina not extending so high up. 



The scutum (PI. IX. fig. 11./ is considerably larger than the tergum, its occludent 

 ni is bowed and long, its tergal margin is hollowed out, or (in the largest specimen) 



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