294 CEYLON PEARL OYSTEE REPORT. 



Family : CIRRATULID^. 



Cirratulus cylindricus, Schmarda Plate VI., figs. 139 and 140. 

 Schmarda, 1861, ' Neue Wirbellose Thiere,' ii., p. 59. 



Localities : Galle, East Cheval Paar, &c. Associated with Eupomatus heteroceros, 

 Eunice antennata, &c. 



The paired dorsal acervi of tentacular cirri occur on the fifth setigerous segment, a 

 double row on each side separated by an interval across the middle line. The body 

 is short and thick, simply flexed, not twisted, and equal at both ends ; length 

 16 millims., diameter upwards of 3 millims. ; setigerous segments 130. The head is 

 round and short, crescent-shaped, the mouth gaping below. Capillary setae commence 

 on the fourth segment, the ventral acicular setse appear on the 19th setigerous 

 segment, the dorsal acicular seta? on the 23rd ; the capillary seta? are continued to 

 the end of the body. 



In C. dasylopkius, Marenz., the tentacular acervi occur on the dorsum of the third 

 and fourth setigerous segments ; the ventral aciculse begin on the 29th, the dorsal on 

 the 43rd. In C. comosus, Marenz., the tentacular acervi occur on the seventh 

 setigerous segment; the ventral aciculse begin on the 42nd, the dorsal on the 85th. 

 Both these species are from South Japan. The acicular setae afford no diagnostic 

 character in themselves. 



Another, and perhaps more typical, individual of 30 millims. (from Galle, 4th 

 August, 1902), which I assign to this species, shows the same form of head, but the 

 dorsum of the anterior segments is elevated, and the tentacular acervi extend over 

 more than one segment (Plate VI., fig. 139). The gill-filaments are inserted high up 

 on the body, remote from the dorsal fascicles ; the ventral acicular setae commence on 

 the 11th setiger, the dorsal about the 26th. The frontal border shows pigment 

 specks (Plate VI., fig. 140). 



In another specimen of 35 millims. from East Cheval Paar, 8th November, 1902, 

 8 fathoms, the ventral acicular seta? commence on the 9th setigerous segment, as 

 many as six in one fascicle in the anterior segments, becoming less numerous and 

 stouter behind ; the dorsal acicular setse are more slender than the ventral, and commence 

 on the 25th setigerous segment. The first lateral branchial filament appears on the 

 first setigerous segment, the transverse acervi occur in the region of the 7th and 8th 

 body-segments (i.e., 4th and 5th setigerous segments). Behind the acervus the 

 segments carry one pair of branch ise inserted at slightly different levels, lateral and' 

 more dorsal. 



Cirratulus complanatus, n. sp. 



Station XLV, off Panadure, 25 fathoms. Three specimens. 



The length of the ribbon-shaped body is 33 millims., greatest width 5 millims. 

 The body is much flattened, giving a flattened rectangle in section ; the head pointed, 



