108 AUSTRALIAN- SYLLIDAE, EUSYLLIDAE AXD ACTOLYTIDAE, 



lonjr. and eorup rises only 24 segments, but is obviously incomplete. It is of a 

 general gi-ey colour, darker in the region behind the proventriculus than in front. 

 The colouration proves under the microscope to be due to the presence of irreguhir 

 patches of black pigment partly arranged in broken transverse lines. This occurs 

 not, as is usually the case, in the dorsal integument, but deep within the muscular 

 layers — presumably in the peritoneum. 



The pharynx and proventriculus are displaced owing to rupture: tlie teeth 

 and jaw-pieces, so far as they can be seen, closely resemble those of 0. detectn. 

 The acicula do not end in a simple point, but are sharply bent forwards at tl.c 

 extremity . 



Genus A ii B L y o s y l L I s Grube. 



AiiBLYOSYLLis SPECTABiLis Johnston. (Plate xiii., figs. -I-IO). 



Pterosyllis (Gattiola) spectabilis, Johnston, (29), p. 195, PL xvia. figs. 1-7. 



Pterosi/llis formosa, Claparede, (4), p. 46, PI. xiii., figs. 30-34. 



Pterosyllis plectorlnjncha, Marenzeller (42), p. 47, PI. 5, fig. 3. 



Amblyosyllis Madeirensis, Laugerhans. (3G|, p. 561, PL 32, fig. 19. 



Pterosyllis (Gattiola) spectabilis, St.-Joseph, (48). p. 63, PL 9, figs, 64-67. 



This small Syllid occurs sparingly among the roots of Eklonia a few feet 

 below low-water mark in Port Jackson. 



The length is about 1 cm. iind the number of segments 14 to 30. Some 

 specimens are colourless or nearly so, or have only the dorsal cirri pigmented ; 

 others, in addition to the pigment in the cirri, have an elaborate pattern formed 

 of dark pigment on the dorsal surface of the segments; others have a systom 

 of transverse violet lines. In some female specimens, two longitudinal wolet 

 lines run throughout the intestinal region. In some the only internal colouration 

 is due to the orange intestinal epithelium. The tentacles and eim, including the 

 ventral, are full of mulbeiTy-shaped glands which discharge fine thread-like bodies. 

 All the tentacles and the dorsal ciiTi are alike in not being distinctly segmented 

 at their bases. The prostomium. (Plate xiii.. fig. 4) rounded in outline, bears 

 two pairs of eyes of variable size dorsally and a third, very minute, pair in front 

 of them, but on the ventral surface, and therefore directed downwards. The 

 median tentacle is about ten times the lengtii of the prostomium, the lateral about 

 four or five times. The palpi (PL xiii., fig. 5) are very short, scarcely visible from 

 above, united together for a short distance in front of the mouth to form a sort 

 of upper lip with a median suture; laterally each extends outwards so as to pro- 

 ject slightly beyond the lateral border of the prostomium. 



The peristomium. small and closely united to the prostomium, bears dors- 

 ally and laterally, widely separated from one another, a pair of ciliated lol)es 

 which represent the "ailerons occipitaux" or nuchal wings of other spe<'ies. 'I'hese 

 may be short and globular, or may be elongated so as to extend back over the 

 first setigerous segment. The dorsal iierisfnmial tentacle is longer than the 

 ventral, about the lengtii of the lateral iirostmiiial. 



The parapodia (fig. fi) have a very distinct anterior lobe or lingula. Each 

 bears some 5 to 12 stout, bidentatc. compound setae (figs. 7 and 8) witli very fine 

 i;nd short cilia on the cutting edge. The acicula, usually five or six in each 

 ]iarapodiuni, are straiglii and iiointed. The dorsal cirri are much longer than 

 the breadth of the body in tlie living and active condition; tliey are not definitely 

 segmented towards the base. The })road ventral cirri are longer than the para- 

 podia. The penultimate segment has two pairs of jointed cirri, the dorsal the 



