420 STHENELAIS LIMICOLA. 



Feet. — The tufts of bristles from the first foot project somewhat outward dorsally, 

 obliquely inward ventrally. They all appear to belong to the dorsal type, consisting of 

 long, slender, finely serrated bristles with hair-like tips. The dorsal tuft is the longer ; 

 the inferior, moreover, presenting proportionally more of the smooth shaft at the base. 

 The dorsal group alone possess a spine, and Pruvot and Kacovitza consider the inferior 

 group as representing the ventral tuft. 



The second foot has its dorsal lobe only slightly separated from the ventral, but the 

 spine has a special free papilla. Just above it three extremely elongated papillse 

 (stylodes) project from a common base. A long tuft of dorsal bristles — very finely 

 serrated — arises from this lobe. They are directed forwards and inwards. The ventral 

 division of the foot is bluntly rounded, extends further outward than the dorsal, and 

 bears three groups of long papillaB, each springing from a basal process. The first arises 

 from the tip above the spine, and has attached to it about four long papillas, the longest of 

 which projects further than the dorsal, since its basal process is carried out by the ventral 

 division. The knob enclosing the spine gives attachment also to four, while a prominent 

 peduncle just above the group of slender inferior bristles carries three. All these 

 processes are somewhat translucent, granular, and with a cellulo-granular and almost 

 transparent tip. The upper ventral bristles have tips of great length and tenuity, no less 

 than about twenty divisions occurring in the terminal appendage, which is capillary at the 

 tip, and, if fringed with minute algas, it resembles a pinnate hair. 



The feet gradually merge into the typical form (Plate XXXI, fig. 6), which dorsally 

 below the branchial process shows three ciliated pads (ctenidia), and a few small clavate 

 papillas on the region between them and the bristles. This (dorsal) lobe is somewhat clavate 

 in outline, and has four or five long papillae (stylodes) from its upper terminal region, the 

 spine passing out inferiorly. The bristles are slender, long, finely spinous, tapered, and 

 form a fan directed upwards, outwards, and slightly backwards. Parasitic structures 

 are common on these bristles. 



The ventral division is shorter and broader than the superior, and is somewhat 

 conical at the tip, while a large flattened and leaf-like lobule projects above the spine, 

 and a smaller lobule at the ventral edge. The large lobule shows a process or papilla 

 extending beyond it, and in its granular epidermic layer are large glandular areolaa. The 

 superior ventral bristles have the type of those in S. boa, only more slender. They are 

 simple tapering bristles with bold spinous rows at first, and then more minutely spinous 

 towards the slender tip (Plate XLII, fig. 1). Beneath are a few with stout curved shafts, 

 a short bifid terminal region, and a single articulation (Plate XLII, fig. 1), an arrange- 

 ment which also occurs in the following three or four segments. The next are rather 

 slender bristles with long tapering tips, having from nine to nearly twenty segments 

 (Plate XLII, fig. 2) with a minute hook at the tip. Then follows a stouter series 

 (Plate XLII, fig. 3) with long tips, also bifid, the shafts becoming more slender as we 

 proceed downward; and lastly, a much more delicate group at the ventral edge, with 

 from five to ten segments in the terminal region, which also has a minutely bifid tip. 



The ventral cirrus is long and tapered, with a terminal segment (Plate XLII, fig. 4), 

 or occasionally two. 



In the posterior feet little change takes place in the dorsal lobe, except a diminution 



