PLATE CXXVIII. 
Fie. 
l and 1’. Geniculate posterior bristles of Sabella, B.C. (var. of Potamilla Torella, 
Malmgren). x oc. 4, obj. D. 
lq. Anterior winged bristle. x oc. 2, obj. D. 
1. Anterior hook. x oe. 4, obj. D, with draw-tube. 
lc. Posterior hook. x oc. 4, obj. D, with draw-tube. 
2. Anterior bristle of Potamilla reniformis, Leuckart. x oc. 2, obj. D, with draw-tube. 
2, Anterior spatulate bristle. x oc. 4, obj. D. 
2. Spatulate form with broader wings. x oc. 4, obj. D. 
2c. Posterior geniculate bristle.  X oc. 2, obj. D. 
2d. Minute flag-like forms accompanying hooks. x 900. 
2e. Anterior hook. x 900. 
2 f, 2 f'. Posterior hooks. x oc. 4, obj. D, with draw-tube. 
3. Winged anterior bristle of Potamilla Torelli, Malmgren. x oc. 4, obj. D. 
3a. Broadly winged (spatulate) bristle. x oc. 4, obj. D. 
36,3’. Posterior bristles. xX oc. 4, obj. D. 
3c. Anterior hook. x oc. 4, obj. D, with draw-tube. 
3. Posterior hook. xX oc. 4, obj. D. 
4, Simple winged bristle of Branchiommna vesiculosum, Montagu.  X oc. 2, obj. F, with 
draw-tube. 
4. Slightly curved winged form (upper). xX oc. 2, obj. F, with draw-tube. 
4), Posterior geniculate bristle. Xx oc. 2, obj. F, with draw-tube. 
4¢ and 4c’. Antero-posterior view of winged geniculate forms. x oc. 2. obj. F, with 
draw-tube. 
4dand 4d’. Bristles with broader wines accompanying hooks. xX oc. 4, obj. F, with 
draw-tube. 
4.e. Anterior hook. x oe. 4, obj. F. 
4.f. Posterior hook. xX oc. 4, obj. F. 
5. Serrated bristle of Bispira volutacoriis, Montagu, with shorter tip. X oc. 
¢ 
2 OldI}o 1D), 
with draw-tube. 
5a. Anterior bristle with broader tip (knife-blade). x oc. 2, obj. D. 
5b. Long tapering serrated bristle from Plymouth. x oc. 2, obj. D. 
5c. Tip of small bristle accompanying anterior hooks. X oc. 4, obj. D. 
5d, Anterior hook. X oc. 4, obj. D. 
5 e. Tip of branchia. 
6. Posterior hook of Dasychone lucullana, Delle Chiaje, from Naples. x oc. 4, obj. D. 
