POLYCH^ETA. 269 



12 to 16 compound falcigeroua bidentate setae lying below 5 acicula? ; the aciculae 

 become reduced to 3 and posteriorly to 2 ; the setae also undergo changes, the shaft 

 becoming stouter and the appendix shorter ; the shaft further assumes a characteristic 

 dilatation of varying intensity below the joint (Plate III., figs. 77 and 78). 



The anal cirri showed 24 joints ; no median caudal process was observed. The 

 head of the second specimen was normal, rounded, not transversely elongate, the 

 latter condition apparently resulting from the commencing extrusion of the pharynx. 

 The palps are quite separate, with distinct subfrontal insertions, a wide proximal 

 half and a narrower distal hah. 



In Typosyllis rarityata, according to von Marenzeller," the palps are fused 

 together at the base. The Ceylon species would appear to be related to T. hrohni, 

 as described by Langerhans. t The difference noted above in respect of the shafts 

 of the setae may be correlated with the difference of age and size of the specimens of 

 T. taprobanensis. 



Haplosyllis spongicola (Grube) Plate III., figs. 79 and 80. 



Gkube, 'Arch. Naturg.,' 1855, p. 104; Marion et Bobketzky, 1875, 'Ann. Marseilles,' p. 2-i. 

 Syllis haniata, Claparede, 1868; Langerhans, Madeira, 1879, ' Z. f. w. Z.,' xxxii., p. 527; 



St. Joseph, ' Dinard,' 1886, part i., p. 142; 1895, part iv\, p. 185. 

 Syllis violaceo-flava, Grube, 'Ann. Semp.,' 1878, p. 115; see also Langerhans, Madeira, 



part iii., ' Z. f. w. Z.,' xxxiv., p. 128. 



A small specimen, 4 '5 millims. long, was takeu from between the whorls of the 

 operculum of a large Serpulid [Pomatostegus actiuocc7vs^, off Panadure, Station XLV., 

 25 fathoms. 



Over 40 setigerous segments ; setae brittle, many of them with the tips broken off. 

 The proventriculus is long, occupying segments 13-25, but the body is contracted. 

 On examining the specimen in toto. it is common to see two hamate unguarded 

 acicular setae projecting from a parapodium, one of which is stronger than the other ; 

 both of these seta? have a bidenticulate apical tooth as figured by Marion and 

 Bobretzky, and by Langerhans. (In Haplosyllis djiboutiensis,\ Gravier found, in 

 one individual, the apical tooth of the stronger seta simple. ) The pharynx is armed in 

 front with a single conical tooth surrounded by a crown often soft papilla? (Plate III., 

 fig. 80). The head is shown in Plate III., fig. 79. 



Syllis gracilis, Grube (1840). 



(Of. St. Joseph, "Ann. de Dinard," part i., 'Ann. Sei. Nat.' (7) i., 1886, p. 158; part iv., 

 t. xx., 1895, p. 190.) 



Locality : South-west Cheval Paar. Three specimens. 



1. About 180 segments ; length 45 millims. ; body contorted ; diameter uniform, 



* ' Adriat. Ann.,' ii., 1875, p. 147. 



t ' Wurmfauna Madeira," i., ' Zeit. f. wiss. Zool.,' xxxii., 1879, p. 529. 



| Gravier, "Ann. Mer Rouge," 1900, 'Arch. Mus. Paris' (4) ii., p. 117. 



