6o6 Memoirs of the Indian Museum. [Voi,. V, 



cally unchanged. The setae of the dorsal division have longer and more slender ter- 

 minal pieces than those of the ventral division, and the serrations are not so long 

 (figs. 6k, 61,). The falcate homogomphs are confined to the ventral division. In some 

 of the long-tipped setae the shaft is quite homogomph, but in others it is produced 

 into a point at one side (fig. 6n), the so-called f hemigomph ' "condition. 



The nth foot has 8 lobes, the 12th has 9 lobes, in the dorsal division. In the 

 ventral division the upper anterior lobe has increased, and the posterior lobe decreased 

 in size relatively. 



In the 13th foot the dorsal division has n lobes, in the 14th foot 21 lobes, in the 

 15th foot 28 lobes, and in the 16th foot 32 lobes. The number of these lobes or 

 filaments reaches its maximum in the 21st foot, where there are about 65-70 

 (fig. 6f, and text-fig. iod). They appear to be arranged in three groups, each 

 group having a common stout stem, lying side by side. The median ligule is large, 

 and the setigerous fillet of the dorsal division rises from its upper side, curves for- 

 wards and upwards, and is attached beneath the filaments. In the ventral division 

 the posterior lobe is greatly reduced. 



In the 23rd foot the lower anterior lobe of the ventral division has disappeared, 

 and the upper one is small. The posterior lobe still has a pointed tip. The setae 

 are much fewer in number, and there are about 55 filaments in the dorsal division. 



In the 25th foot the dorsal filaments are much fewer in number, and appear to 

 spring from four main stems. The ventral division is now without pointed lobes, 

 and the setigerous fillet forms a broad rounded flap behind the setae, and a smaller 

 one in front, the setae curving round the minute remnant of the upper anterior lobe, 

 which is first visible in side view. The spines are only black near the tip, having 

 grown gradually paler from the front backwards. In the 26th foot (fig. 6h) the 

 filaments rise from four stems, the lower one being unbranched. In the 27th foot 

 (text-fig. ioe) there are only three filaments rising from a single stem. The ven- 

 tral division consists of two fillets attached to the median ligule. The remnant of 

 the anterior upper lobe, round which the setae form a circle, is very small, and is not 

 visible in side view. 



In the 28th and 29th feet there is only a simple short filament beneath the dor- 

 sal cirrus, and in the 30th foot this also has disappeared (fig. 6j, and text-fig. 10/). 

 The lobe inside the ventral setae has also vanished. In the middle and posterior 

 parts of the body the foot does not change much in shape, but gradually grows 

 smaller, the setae become fewer in number, and the median lobe and setigerous 

 fillets smaller and more indistinct. 



The falcate homogomph setae, with smooth terminal pieces (fig. 6m), are regu- 

 larly present in the ventral divisions of the anterior 25 feet or so. They then 

 become fewer m number, and are frequently absent in many adjacent feet. They were 

 noted, however, in the 70th and 80th feet. The ventral and spinose setae have, as a 

 rule, shorter terminal pieces with longer serrations, than those of the dorsal division 

 (fifts. 6k, 6iy), but both kinds frequently occur in the ventral division. 



It can hardly be doubted that the dorsal filaments of the anterior feet have a 



