22Ó 



a half times the distance between the extremities of teeth 2 and 3. Tooth 5 pointed. Lower 

 angle small, vet well-developed, and terminating in 2 or 3 very small, flat, pointed teeth. 

 Lower part of the whole mandible well-developed. 



Maxilla (PI. XXIII, fig. 9) with a distinct notch behind the two upper spines, a few short 

 hairs being disposed at the base of the notch. Between the notch and the two lower spines, 

 the free edge bears only 2 or 3 spines ; where there are three spines the first after the notch is 

 represented by a pair. The upper two spines are longer, the others hardly differ in size. The 

 shape of the maxilla is triangular, its upper margin strongly bowed ; the apodeme is long, as 

 long as the maxilla itself, the spines included. 



Outer maxillae (PI. XXIII, fig. 10) have the outer lobe short and broad, and the 

 hairs on the surface and at the free extremity not very numerous. The tuft forméd by them on 

 the extremity is not very dense. The inner lobe has the surface that is directed to the 

 interior rounded, and covered with several stronger and feathered hairs, part of which are 

 directed towards the basis of the maxilla. The outer maxillae, like the other parts of the 

 mouth, show great resemblance to the corresponding parts of B. calceolus and other species of 

 the section. 



Cirri. First pair: branches unequal, with 5 to 6, and 9 to 10 segments. Segments 

 not strongly protuberant, those of longer ramus somewhat more so than those of shorter ratnus. 



Second pair: 7 and 8 segments respectively in the two rami; distinctly developed tufts 

 of hairs disposed on the protuberant parts of the segments. 



Third pair: with 8, and 9 to 10 segments respectively. Groups of hairs less-developed 

 than on cirri of 2 nd pair, standing off in all directions and forming no distinct tufts. 



Fourth pair: with 14 and j6 segments respectively in the two rami. 



F i f t h pair: with 1 5 and 1 7 segments respectively. 



Sixth pair: with 17 to 18, and 18 to 19 segments. Three pairs of spines on the inner 

 face of the segments (PI. XXIII, fig. 11); in a very few cases only, a tracé of a fourth pair 

 could be made out. On the outer face of each segment and near the extremity, a few spines 

 are seen, one of which is much longer than the others, and exceeds the length of the segments. 



Penis: long in the one, unusually long in the other specimen, tapering towards the 

 extremity ; very few hairs scattered over its surface. 



This interesting species of Balamis lives attached to the branches of an Alcyonarian, 

 which Nutting has determined as Acanthogorgia trtmcata Studer. 



It was collected at : 



Stat. 310. February 12, 1900. Lat. 8° 30' S., Long. 1 19°/'. 5 E. Flores-Sea. Depth 73 m. Bottom: 

 sand with few pieces of dead coral. 



General Rem ark s. This species shows relationship to B. navicula in some respects at 

 least. It forms a very natural and at the same time characteristic group with the other species 

 of the same section. 



A small specimen of a Balamis collected by the Siboga at Station 260, belongs, 

 probably, to the same species. It was found attached to a reddish-brown stick, its shape 



98 



