348 PEECY SLADEN TEUST EXPEDITION. 



29. Psammolyce gracilis, sp. n. ? (Plate 19. fig. 20 ; Plate 21. figs. 60, 61.) 



Measurements. There is only an anterior fragment measuring 5 mm. in breadth, 

 15 mm. in length, and containing 36 segments. 



Head exactly like that of P. farqnliaremis. Ventral setae of second and third segments 

 resembling those of last-named form, but lowest gi'oup still smaller and slighter. In 

 succeeding segments uppermost setae (fig. 61) always preserving a fairly long appendix 

 •with acute tip and slender spur beneath. Even at ninth segment some still possessing 

 a spinulose shaft. 



Elytra (fig. 20) without a posterior club-shaped appendage (as in preceding species), 

 and so agreeing with those of P. rigida and zeylanica as figured by Willey. Two pro- 

 jecting processes on the inner margin, but anterior of these not well-developed. 



Locality. Saya de Malha, C 12, 47 fathoms ; dredged with Panthalis edriophthabna 

 and Sthenelais ; " bottom muddy with a little shell material." 



It is quite likely that this is a smaller form of P. furquharensis, since variability in 

 the genus is known to be great. I have put it in a separate species, however, to 

 emphasise the possibility of splitting up the genus Psammolyce into natural species 

 by the differences of the elytra. 



Genus STHENELAIS. 

 The following is a synopsis of the species described here and in Dr. Willey's paper ; — 



' S. orientalis, sp. n. 



(S. boa of Medi- 



Spinose simple setae in upper part of notopodium •{ terranean and 



I Northern seas 



^ belongs here). 



, , , rElvtra variable ir dilation S. variabilis, sp. n. 



Spinose simple and compound setae • , , i • i i 



'^ . . ,. -i Elytra partly covered with cal- 



in upper part oi notopodium . . -« , 



L careous concretions &. calcarea, sp. n. 



„ . . , , r T t f "S- ieylanica, Willey. 



Spinose simple setae absent from notopodium ' „ . ,. 



J \. h.joliosa, sp. n. 



80. Sthenelais orientalis, sp. n. (Plate 21. fig. 62.) 



Measurements. Only antertior portion preserved. It is a large Sthenelais of size equal 

 to S. boa, for its width is 7 mm. S. zeylanica, Williey, is probably a little smaller. 



Head like that of S. boa, but ctenidia of median tentacle not large enough to hide 

 anterior eyes. Palps long, but not equal to those .of .S'. boa. Elytra fleshy and dead- 

 white in colour, outer and posterior margins beset with cilia (outer margin only in 

 S. boa), surfaces thickly covered with tubercles, with definite spinose development. 

 Three kinds of ventral setae : — (1) superior simple spinose (generally consisting of only a 

 single seta); (2) midventral compound setae with short appendix; and (3) inferior ventral 

 compound setae with long jointed appendix. Midveatral (2) setae specially characteristic, 

 very strong, with thick yellow shafts and appendices shorter than in other species (fig. 62). 



Locality. Amirante, E 11, 25-50 fathoms. The species has obvious affinities w ith the 

 Atlantic and Mediterranean species S. boa. In general appearance they are dissimilar. 



