53 



along the sides of the body. These bristles (PI. XII, fig. i i) have three recurved fang.s on 

 each side beneath the spear-head, that are not (luite opposite to each other. However the 

 .short dorsal bristles differ much in shape from those in //. hysirix\ their distal half is slender, 

 smooth, terminating in a faintly curved tip (PI. XII, fig. 12). Wii.lky describes them as a 

 flabelluin of curved, smooth-tipped setae radiating dorsad, but it is to regret. that he gives no 

 figure of them. The bifurcated ventral .setae (PI. XII, fig. 13) are provided with a small acces- 

 sory tooth. The head possesses a long and .slender tentacle, nearly equalling in length the dorsal 

 tentacular cirrus and provided with a short, clavate terminal joint. (In this regard the Siboga- 

 specimen differs from Grube's H. iiiallcafa, for he describes and figures the tentacle as rather 

 short, twice as long as the head and shorter than the ventral tentacular cirrus). On each side 

 of the tentacle there is an eye-peduncle, not very large, with distinct eye-.spots. The palps are 

 long and very slender in their distal part ; they are densely beset with spinous papillae. 



At Stat. 43 a small Hcnnionc (long 10 mm.) was caught, that agrees with the prece- 

 ding one in the appearance of the short dorsal bristles, however the glochideal setae are 

 yellow, with dark-coloured basal and distal end. Perhaps it is a young one. The place of 

 attachment of its elytra is iridescent. 



o- 



Herniionc parva Horst. PI. XII, figs. 14 — 16. 



Horst, Zool. Mededeel. K. Museum Nat. Historie, Leiden, vol. II, 1916, p. 70. 



Stat. 60. Haingsisi, Samau Island. Depth 23 M. i specimen. 



Stat. ósa.North off Tanah Djampeah. Depth from 400 M. i specimen. 



At the .Station 65=^ a small Hcrinione was caught, with the proboscis everted. 



It measures about 15 mm. in length. All the bristles are pale-yellow, the glochideal 

 ones somewhat darker in their distal part; they are directed towards the median dorsal 

 line and arch over the elytra (PI. XII, fig. 14). Their shaft is covered with minute tubercles 

 and the tip bears on one side two and on the other side three recurved fangs beneath the 

 spear-head. In a specimen from Haing.sisi (long 18 mm.) the dorsal bristles are pale-brown 

 coloured. The short dorsal bristles (PI. XII, fig. 15) of the elytral .segments are nearly straight, 

 also beset with small tubercles and terminate in an acute tip, somewhat resembling a Y&n. 

 The bifurcate ventral setae (PI. XII, figs. lórt- and b) are usually provided with an accessory 

 tooth. The head is roundish oval, with a tentacle consisting of a stout conical, tuberculated, 

 basal part, a slender median joint twice as long as the head, dilated distally and a short cla- 

 vate terminal part. There are two large eye-peduncles, each provided with a large ventral and 

 a smaller dorsal pigment-spot. The palps are rather long, smooth, tapering distally and mea- 

 sure about two thirds of the length of the proboscis. The tentacular cirri are long and slender, 

 like the other cirri also provided with a clavate terminal joint; the ventral ones measure 

 two thirds t)f the length of the dorsal ones. 



SIEOGA-F.XPEDITIF, XXIV ' b. 



