6i8 



Memoirs of the Indian Museum. 



[Vol. V, 



The branchiae are distributed in the type specimen as follows : — 



No. of 



No. of 



Position of 



No. of 



No. of 



Position of 



filaments. 



segments. 



segments. 



filaments. 



segments. 



segments. 







32 



1-32 



7 



38 



268-305 



i 



6 



33-38 



6 



17 



306-322 



2 



4 



39-42 



5 



2 



323-324 



3 



22 



43-64 



4 



12 



325-336 



4 



19 



65-83 



3 



10 



337-346 



5 



44 



84-127 



2 



5 



347-351 



6 



12 



128-139 



1 



5 



352-356 



7 



27 



140-166 







4 



357-360 



8 



IOI 



167-267 l 









There is, of course, considerable variation in the distribution of the branchiae, and 

 the numbers of filaments frequently differ on the two feet of the same segment. In 

 three other specimens the first branchia appears on the 36th, 42nd, and 52nd feet res- 

 pectively. The maximum number of filaments is 8 or rarely 9. They are much longer 

 than the dorsal cirrus, and are crowded together on a short stem (fig. 13G). 



The mandibles (fig. 13D) are blackish at the posterior ends, paler in front. The 

 ringed anterior ends are small, and the two halves are not very firmly attached to 

 each other. The maxillae (fig. 13c) are stout and boldly curved, the posterior pro- 

 cesses being spatulate. The maxillary plates have 6 teeth on the right, 5 teeth on the 

 left side. The azygos plate on the left has 7 or 8 teeth, whilst the anterior crescen- 

 tic plates have 9 teeth on the right, 6 on the left. Dark horny patches of indefinite 

 shape occur in front of and at the side of the anterior toothed plates. The right 

 anterior crescentic plate bears less resemblance to its corresponding left plate than it 

 does to the azygos plate. 



The feet increase gradually in size up to the 10th. The ist foot (fig. 13E and 

 text-fig. 13a) has stumpy rounded dorsal and ventral cirri, and a short rounded 

 median lobe behind the setae. In front there is a thin fillet guarding the setae. 

 The foot is very vascular. There are three black spines, lying horizontally. The 

 setae are in two groups, above and below the spines. The dorsal group consists of 

 about 9 capillary setae of various lengths, with flattened, very finely serrate blades 

 (fig. 13H). Ventrally there are 7 or 8 compound setae (fig. 13J). The tip of the 

 shaft is bevelled, and has a row of spines along the upper edge. The blade is very 

 finely serrated, and tapers to a long filiform tip. The 2nd foot resembles the ist, but 

 the setae are more numerous. 



The 5th foot (text-fig. 13Ô) has 4 black spines. The setigerous lobe is relatively 

 larger and the setae much more numerous. The setae are enclosed within two fillets, 

 which are attached by their edges to the middle lobe, and lie outside the spines. 



The 10th foot has 5 spines, and the ventral setae are still more numerous. In 

 the 25th foot there are 4 spines, and 2 brush setae (fig. 13K) appear, lying in front 



A few of these have 9 filaments. 



