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The species was first described by Mc Intosh from the coast of Japan at a depth of 565 

 fathoms. It is hard to understand why Mc Ixtosh ranges this species among the genus Lactmonicc. 



Genus HalOgenia Horst. 



Agreeing in its maiii characters with Hermione and Laefnioiiicc, but distinguished by 

 the presence of dorsal bristles, terminating in a large, curved hook. 



1. Ifalogenia arenifera Horst. PI. XII, tïgs. 17 — 19. 



Horst, Zool. Mededeel. R. Museum Nat. Historie, Leiden, vol. II, 1916, p. fii. 

 Stat. 49a. 8°23'.5 Lat. S., 1 19°4'.6 Long. E. Sapeh Strait. Depth of 69 M. i specimen. 



Body ellipsoidal, long 12 mm., broad 7 mm.; the number of its segments is about 30. 

 The ventral side is rough, densely beset with small tubercles, whereas the dorsum is entirely 

 covered by sand-grains, that are adhering to the elytra. No dorsal feit could be detected. 

 The parapodia are slender, conical, measuring in length two thirds of the breadth of the body. 

 The sides of the body are flanked by long dorsal bristles, that are thin and flexible, pale- 

 brown coloured (PI. XII, fig. 17); they show a fine, longitudinal striation and terminale 

 at their distal end in a large, dark-brown hook, bearing on its convex side a conical 

 point. The bristle is surrounded by a sheath, that (presumably bj- the influence of the spirit) 

 has a wrinkled appearance and above the hook pas.ses in a rather long filiform appendage, 

 that in its basal part shows a small enlargement. In the anterior segments these bristles are 

 so long, that bent backward they almost reach to the end of the body. In front of these unci- 

 nate bristles some barbed setae are situated (PI. XII, fig. 18), provided with a rather long 

 spear-tip, behind which two or three recurved fangs occur. Each ventral bristle has about a 

 dozen of spikes and a large spine at some distance beneath them (PI. XII, fig. 19). 



The head is rounded rectangular, somewhat broader than long, with a folded ridge at 

 the right and left side. The tentacle has a stout, conical basal joint, almost half as long as 

 the head ; its terminal part is broken of. On each side there occurs an eye-peduncle, with a 

 large black spot. The palps are long and tapering ; bent backward they reach to the 10"' seg- 

 ment. Also the tentacular-cirri are long and slender, provided with a terminal enlargement : the 

 dorsal one is a third longer than the ventral one. 



2. Halogenia conchifera Horst. PI. XII, figs. 20 and 21. 



Horst, Zool. Mededeel. R. Museum Nat. Historie, Leiden, vol. II, 1916, p. 64. 



Stat. 260. 5° 36'. 5 Lat. S., 132° 55'.2 Long. E. West off Great Kei Island. Depth of 90M. i specimen. 



A small worm, measuring 9 mm. in length and consisting of 27 segments. Its body 

 is oblong ellipsoidal, flat ; the ventral side is rough, beset with globular papillae, whereas the 

 dorsum is covered by sand-grains and shells of Mollusca and Foraminifera, adhering to the 

 scales and the bristles of the cirriphore-segments. The elytra are thin, translucent ; presumably 



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