82 



papillae, provided with a distal knob, as also occur on the surface of the elytra. Besides 

 their surface is covered with small papillae, that in the posterior part of the elytron acquire 

 a keeled appearance. The head is somewhat longer than broad, rounded rectangular, divided 

 in two halfs by a shallow groeve ; it bears the two pairs of indistinct eyes on the lateral border 

 of its posterior part. Of the antennae the median one (tentacle) is very long, surpassing the 

 lateral ones with a third of their length ; it has a filiform tip and is dilated beneath it. The 

 lateral antennae are also hliform distally, somewhat longer than the palps. All antennae are 

 beset with papillae and their basal joints are mottled with black. The palps likewise are papil- 

 liferous, with an abruptly filiform tip. The parapodia are provided with slender papillae ; their 

 neuropodial fascicle (PI. XIX, fig. 2) consists of stout, dark yellow bristles with a simple hooked 

 tip and only two or three spines on each side. The notopodial fascicle contains some slender, 

 tiliform setae, serrated along their edge. The dor.sal cirrus is very long, extending with its 

 slender tip to the extremity of the neuropodial fascicle; the ventral one however is rather short 

 and hardly reaches the base of the fascicle. 



3. Halosydna bathcia n. sp. PI. XIX, figs. 3 — 5. 



Stat. 52. 9° 3.4 Lat. S., r 19° 56'./ Long. E., North off Sumba Island. Depth 959 AL 2 specimens. 



In the dejjth of Savii Sea two specimens were dredged, a smaller and a larger one ; 

 the last one was met with by my colleague Mr. Caullery in a large oozy tube. 



It has a length of nearly 15 mm. and consists of about 48 segments. The head is 

 rounded, somewhat broader than long, divided by a shallow median groove in two halves ; no 

 eyes are visible. The tentacle is long and slender, tapering distally, it measures about four 

 times the length of the head. The lateral antennae are present in the smaller specimen only 

 and are nearly twice as long the head. The palps, nearly as long as the tentacle, have an 

 abruptly filiform tip. There are 20 pairs of scales, leaving the middle of the dorsum uncovered; 

 each elytron (PI. XIX, fig. 3) is oval, translucent, granular, smooth, with the scar of attach- 

 ment situated somewhat eccentrically, whereas several ramifying nerve-stems are emerging from 

 it. The parapodium (PI. XIX, fig. 4) consists of a reduced, papilliform no,topodium, only con- 

 taining the acicula, and a large, elongated triangular neuropodium ; its anterior lip is obtuse, 

 oval, shorter than the posterior one, that is pointed, papilliform. These lips consist of a loose,' 

 translucent tissue, composed of large cells, that also occur in the basal part of the dorsal cirrus. 



The neuropodial bristles (PI. XIX, fig. 5) have the distal end dilated, with a bifid tip 

 and a dozen of laciniated lamellae ; however in the dorsal part of thê fascicle the setae are 

 long-er, more slender and hardly dilated distally. The dorsal cirrus is long, extending to the 

 distal extremity of the neuropodial fascicle; the ventral one, hardly measuring a third of its 

 length, is enlarged in its basal part and has a filiform tip. Fauvel^) described a Psettdohalo- 

 sydna rosca from the depths of the Atlantic (12 13 M.) differing from Halosydna by the shape 

 of its bristles as well as by the arrangement of its elytra. 



I) Annélides Polychètes non pélagiiiues de l'Huondelle et de Ia Princesse Alice, 1914, p. 37, PI. I, fig. 13; PI. II, figs 1—8. 



3S 



