PLATE CXXXII. 
Fira. 
1. Winged bristle of Ditrypa arietina, O. F. Miller. x oc. 4, obj. D. 
la. Hook. & oc. 4, obj. D, with full draw-tube. 
2. Winged bristle of Apomatus ampulliferus, Philippi. x oc. 4, obj. D. 
2u. Sickle-shaped bristle near tail. X oc. 4, obj. D, with full draw-tube. 
2b. Globular operculum. x Beck 2 in. with 2-in. draw-tube. 
2c. Branchiz and operculum. x Beck 2 in. with 2-in. draw-tube. 
3. Winged, curved bristle of Spirorbis violaceus, var. Caulleryi, Mcl., from Guernsey. 
x oc. 4, obj. F, with 2-in. draw-tube. 
3,3) and 3e. Bristles of the first or collar-series. X oc. 4, obj. D, with full draw-tube. 
3d. Lateral view of tube. Enlarged. 
3e. Aspect of tube from above. Enlarged. 
4. Bristle of the first series of Spirorbis borealis, Daudin. he bristle is slightly turned 
so that the serrations of the basal web are fully shown. X oc. 4, obj. D, with 
draw-tube. 
4a. Winged bristle. x oc. 4, obj. F. 
4). Knite-like posterior bristle. x oc. 4, obj. D, with 2-in. draw-tube. 
4c. Tube. Hnlarged under lens. 
4d. Opereulum. x oc. 2, obj. A. 
5,5’ and 5”. Bristle of the first series of Spirorbis granulatus, L., the latter from 
Guernsey.  X oc. 4, obj. D, with draw-tube. 
5a. Anterior capillary bristle. x oc. 4, obj. D, with full draw-tube. 
5c. Collar-bristle laid on its edge so as to be seen from the dorsum.  X 360. 
5d. Tubes from St. Andrews. Hnlarged under a lens. 
6. Collar-bristle of Spirorbis spirillum, L. x oc. 4, obj. D, with 2-in. draw-tube. 
6a and 6a’. Winged bristles. x oc. 4, obj. D, with full draw-tube. 
6b. Posterior geniculate bristle. x oc. 2, obj. D, with draw-tube. 
6c. Hlongated tube. Hnlarged under lens. 
6d. Tube in close whorls. Hnlarged under lens. 
6e. Operculum. Hnlarged under lens. 
67. Hook from Guernsey. x oc. 4, obj. D, with full draw-tube. 
7. Collar-bristle of Spirorbis militaris, Claparede, basal web turned round. X oe. 4, 
obj. D, with draw-tube. 
a. Winged bristle. x oc. 4, obj. D, with 2-in. draw-tube. 
b. Sickle-shaped bristle from the third foot. x oc. 4, obj. F. 
8. Anterior bristle of Myricola esthetica, Clap. x 360. 
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