188 PSAMMOLYCE ZEYLANICA. 



nearly straight; posteriorly the elytra become notched and 

 lobed, especially at the median side. Usually two lobes 

 occur at the internal corner and a large tubercle at the 

 posterior margin. Their anterior border is smooth, but along 

 the entire posterior margin long filiform papillae are situated ; 

 on the external border they are separated in groups, 

 whereas short, cup-shaped papillae occur in the intervals 

 between them. The scar of insertion is elongated, elliptical. 

 The dorsum between the elytra is beset with rather long 

 filiform papillae, arising from the tip of a short common 

 stem, like in Ps. arenosa (St. Joseph, loc. cit. pi. 2, fig. 26). 

 The tentacle of the head has a terminal joint, at the most 

 one and a half as long as its basal part, and a trifle 

 shorter than the tentacular-cirri, whereas, according to 

 Willey, it should measure thrice its length. In the second 

 segment the neuropodial fascicle consists of compound setae 

 with plumose shaft and slender, elongated appendix, with 

 filiform curved apex as figured by Willey (loc. cit. fig. 36) ; 

 however the figure does not show that they are clearly 

 serrated along the inner border. The third segment has 

 a dorsal cirrus with a curved terminal joint, somewhat 

 shorter than its peduncle. In a normal parapodium the 

 central group of ventral bristles have a stout, short appendix, 

 usually not bifurcated, and a squamous shaft with semilunar 

 cusp below the apex (Willey, loc. cit. pi. II, fig. 43); 

 sometimes however the cusp is absent or faintly developed 

 and then the setae more resemble those of Ps. rigida '). 

 The inferior setae of the fascicle are more slender, with 

 an elongated, bifurcated appendix. 



1) In his „Neuseelandisehe Anneliden" (p. 13) Ehlcrs suggests that Grube 

 under the name of Ps. rigida has iinileJ two closely allied species or two 

 varieties of one species, the one an occidental form (belonging to the Red 

 Sea), the other one with a more oriental distribution (Philippines and New 

 Zealand). Therefore the name of Ps. rigida ought to be maintained for the 

 erythraean form, whereas for the other one should stand the name of Ps. 

 {Telogenia) antipoda, proposed by Schmarda; unfortunately Ehlers himself 

 gives DO detailed description of the bristles of the last named species. 

 Notes from the Ley den Museum, "Vol. ZX!XX"V". 



