SIGALIOU BTJSKII. 433 



mentioned. No branchial process occurs on the papilla supporting this scale, — indeed, it 

 only appears on the papilla of the fourth scale on each side. 



Passing backward the scales assume a somewhat quadrate outline, which in a typical 

 example anteriorly has the inner end rounded, while the external border has about 

 sixteen beautifully pinnate processes, besides a few simple papilla? at one end (Plate 

 XXXI Y, fig. 15). The pinnate processes have a tree-like figure — more robust than in 

 8. Mathildas, and the pinna?, instead of being hyaline cylindrical processes, are lanceolate 

 granular lamella? with a narrowed papillary tip (Plate XXYI, fig. 9). The posterior 

 scales are longer transversely, and have fewer pinnate processes, bnt the structure is 

 essentially the same. The granular epiderm (hypoderm) of the curve between the pro- 

 cesses is denser, more opaque, and in this condition extends up the stalk to the first pinna?. 



Feet. — The first pair project forward just beneath the head, and are bluntly conical 

 with a single spine, which passes forward and upward near the dorsal cirrus— a slender 

 and subulate organ, with a slightly dilated tip in the preparation. It springs from the 

 outer and upper lateral region of the foot. The ventral cirrus arises from the lower 

 part of the foot, somewhat internal to a vertical line from the former, to which it is 

 similar in outline. The tuft of slender simple bristles is directed forwards and upwards ; 

 they are minutely spiked. The palpus is fused with the base of the foot inferiorly, and 

 is shorter proportionally in the specimen than in S. Mathildas. It is finely tapered 

 and quite smooth. Only a blunt papilla occurs in the region of the lateral tentacle. 



The second foot agreed with that in the former species, presenting a well-marked 

 though short dorsal lobe, with a spine and a tuft of simple bristles, and a somewhat 

 trifoliate ventral lobe with a series of bristles. These have long slender shafts with a 

 few spikes on the dilated distal end, and a long jointed and finely tapered distal region, 

 with a slight trace of a bifid (beak-like) tip. 



In the typical foot (Plate XXXI, fig. 11) the superior lobe is shorter than in 

 S. Mathildas, and broadly clavate, the expansion of the tip in lateral view being greater 

 than in the former species. It bears a brush of simple minutely spinous bristles, which 

 spring from the superior and inferior borders as well as the tip. The stronger and 

 longer forms arise above the spine ; the more slender occur for the most part below it, and 

 especially the inner group. The papilla at the tip of the superior lobe appears a short 

 distance behind the front. Three ciliated pads (ctenidia) exist on the superior border 

 between the branchial process and the tip. A stalked infusorian is present on the bristles. 



The ventral division is devoid of the superior papilla observed in S. Mathildas, and 

 has a more prominent papilla for the spine. The ventral bristles are characterised, in 

 contrast with S. Mathildas, by having rather longer terminal processes with bifid tips. 

 The superior series which adjoin the forms with the short tapering spinous region have 

 the terminal portion of the shaft covered with whorls of somewhat sparse spikes 

 (Plate XLII, fig. 18), which are much more numerous than in S. Mathildas, while the 

 stouter bristles below have close rows of minute spikes on the same portion of the shaft 

 (Plate XLII, fig. 19, and in some the rows are closer than in the example figured). One 

 or two below the spine-papilla have only a single articulation in the terminal region, 

 while others have two, and the ends of the shafts in these are smooth, or in the former 

 with only traces of spinous rows. The slender ventral bristles have generally about two 



