POLYCH/ETA. 263 



in this collection by their rather short appendices destitute of serrulations and the 

 wide, nearly horizontal articular end of the shaft, as figured by VON Marenzeller. 



Notophyllum laciniatum, n. sp. Plate III., figs. 61 and 62. 



Station V., oft' Chilaw Paar, Gvdf of Manaar, 1 I fathoms. One specimen. 



This Phyllodoceid worm is characterised by a relatively short and thick body and 

 by the possession of broad closely imbricating scales or phyllodes (foliaceous dorsal 

 cirri) ; the anterior phyllodes conceal the occipital region of the head, meeting across 

 the middle line, the rest leave the mid-dorsum exposed. There are as many as ninety 

 segments. The specimen measures about 20 millims. in length and 3 millims. in 

 breadth. 



The head is simple, with two large eyes in the posterior half, between which arises a 

 brown-tinted tentaculum impar. The somewhat fusiform antennas arise between the 

 eye-region and the anterior border, and the fusiform palps, with rather long terminal 

 flagellum, arise nearer the middle line from the under side of the frontal region. The 

 left antenna was lost from the specimen. The four pairs of tentacular cirri are closely 

 aggregated in the cephalic region, only two of them are seen from above, the second 

 and fourth, the latter being the longest. The first cirrus is more massive thau the 

 others. 



The great character of the species is given by the presence of three cirriform 

 occipital or nuchal lappets, which hang backwards on each side from the back of the 

 head (Plate III., fig. 61). This feature also occurs in Phyllodoce multicirris, Grube 

 ('Ann. Semp.,' p. 100), which is clearly a closely allied species, differing in the 

 structure of the head, especially in the decided possession of four eyes. The seta? and 

 phyllodes also exhibit minor differences. Each occipital lappet has a pale border and 

 a brown centre. The dorsal phyllodes have the same shape and arrangement as 

 figured by Grube for Ph. multicirris, but they do not show the round surface 

 markings of that species. The ventral phyllodes also have the same peculiar 

 disposition, inserted high up near the extremity of the parapodium and lying out- 

 spread behind the pharetra setarum. 



In the seta? the articular end of the shaft shows a character of its own. There are 

 as many as 21 setaa in a ventral fascicle from the anterior region; most of them are 

 broken. In optical section the ends of the shafts appear deeply excavate, the 

 articular fossa bounded by stout refringent walls (Plate III., fig. 62). The dorsal 

 ramus is represented by the lobe upon the summit of which the dorsal phyllode is 

 inserted ; it is penetrated by a single slender acicula. The appendices of the 

 compound setae are rather long and minutely serrulate. 



Phyllodoce dissotyla, n. sp. Plate III., figs. 63 to 66. 



Station V., oft* Chilaw Paar, Gulf of Manaar, 11 fathoms. One specimen, 25 millims. 

 long by 1 millim. broad ; proboscis not extruded. 



