39 



it forms a distinct ridge at the base of the cirrus dorsally, whilst 

 the homologue of the dorsal lamella of the first foot 

 has coalesced with the ventral base of the cirrus and is continu- 

 ous with the dorsal ridge just mentioned (Plate I. fig. 8). More- 

 over, a new process, which first appears at the third foot in front 

 of the spinigerous lobe, has at the 20th foot placed itself between 

 the dorsal and ventral divisions of the foot, that is, has the dorsal 

 tuft above it and the ventral beneath it. Two black spines are 

 present, one to each division. The upper tuft consists of 

 bristles with more slender shafts and longer spinous tips than 

 any in the tuft beneath. At the 30th foot the upper division, 

 viz., the fiattened lamella with the dorsal cirrus at its tip, is now 

 larger in proportion to the rest of the foot beneath, a condition 

 still more evident at the 40th foot (Plate I. fig. 9), in which the 

 vertical diameter of the lamella is equal to the rest of the foot 

 beneath it. At the 60th foot the large somewhat rectangular 

 lamella exceeds in vertical diameter the rest of the foot, and in 

 some the dorsal cirrus springs from the upper angle and not 

 from the middle of the upper edge, but this appears to be due 

 to irregularly from injury or abnormality. The vascularity of 

 the large flattened lamella is now very distinct, and it has a 

 greenish hue. The various lobes of the feet are more dis- 

 tinctly separated from each other, as is also the ventral cirrus 

 from the lobe adjoining. At the 70th foot the lamella stands 

 nearly erect, the inner or dorsal edge being convex, the outer 

 slightly concave (Plate I. fig. 10). There is little change till the 

 tip of the tail is reached — when the flattened process diminishes. 



The upper bristles (Plate II. fig. 12) have moderately elon- 

 gated tips which are finely and closely serrated, the spikes 

 coming off with a curve (the concavity being distal) at the 

 base, but towards the tip they are straight and somewhat more 

 prominent — if less regular. 



Tlie falcate bristles are generally devoid of terminal pieces 

 and it is only by examining small examples of the developing 

 bristle m the foot that a perfect one is obtained. This 

 (Plate II. fig. 11) presents a short brownish tip slightly hooked, 

 and as yet devoid of serrations, but these soon appear as in the 

 figure. The bevelled tip of the shaft is also brownish, and from 

 it the longitudinallyand transversely striated central region passes 

 backwa'-d. With the exception of the tip, the shaft is pale. In 

 the older examples the entire bristle is deep brownish. 



The largest example is a female with well developed ova 

 flowing freely in the coelomic space. 



The food in the alimentary canal consisted — in one — of a 

 peculiar alga with minute stalked globular processes. 



Schmarda's woodcuts are recognizable, though he shows a 

 papilla to the inner side of the ventral cirrus which is not visible 



