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W. C. M‘INTOSH ON BRITISH ANNELIDA. 395 
PLATE LXVIII. 
. Dorsal bristle of Harmothoé sibbaldii, n. s. Magn. 350 diam. 
. Superior ventral bristle. Magn. 550 diam. 
. Inferior ventral bristle. Magn. 550 diam. 
. Front view of a dorsal bristle of H. zetlandica, n. s. Magn. 210 diam. 
. Superior ventral bristle. Magn. 350 diam. 
. Tip of one of the longer dorsal bristles of Polynoé floccosa, Sav. Magn 
390 diam. 
. Tip of a dorsal bristle from a large specimen of H. imbricata. Magn. 350 
diam. 
. Superior ventral bristle of P. floccosa. Magn. 550 diam. 
. Superior ventral bristle of H. imbricata. Magn. 350 diam. 
. Median ventral bristle of P. floccosa. Magn. 350 diam. 
. Median ventral bristle of H. imbricata. Magn. 350 diam. 
. Tip of a dorsal bristle of H. areolata, Grube. Magn. 350 diam. 
. Superior ventral bristle. Magn. 350 diam. 
. One of the most characteristic median ventral bristles. Magn. 350 diam. 
. Tip of a developing bristle of Malmgrenia castanea, n.s., showing the secondary 
process at the end of the spinous rows. Magn. 350 diam. 
PLATE LXIX. 
. Dorsal bristle of Harmothoé zetlandica, n.s. Magn. 350 diam. 
. Dorsal bristle of H. macleodi, n.s. Magn. 350 diam. 
. Superior ventral bristle. Magn. 350 diam. 
. One of the larger dorsal bristles of H. antilopes, n.s. Magn. 350 diam. 
Superior ventral bristle. Magn. 350 diam. 
. One of the stouter forms from the neighbourhood of the spine. Magn. 350 diam. 
. Dorsal bristle of H. haliweti, n.s. Magn. 350 diam. 
. Superior ventral bristle, viewed antero-posteriorly. Magn. 350 diam. 
Another superior ventral bristle, seen laterally. Magn. 350 diam. 
. Inferior ventral bristle. Magn. 350 diam. 
. One of the longer dorsal bristles of H. marphyse, n.s. Magn. 350 diam. 
. Superior ventral bristle. Magn. 350 diam. 
. Median ventral bristle, viewed laterally. Magn. 350 diam. 
. Antero-posterior view of a median ventral bristle. Magn. 350 diam. 
. Inferior ventral bristle. Magn. 350 diam. 
. Profile of one of the longer dorsal bristles of H. lwnulata, Delle Chiaje. 
Magn. 350 diam. 
. Antero-posterior view of another dorsal bristle. Magn. 350 diam. 
. One of the shorter dorsal bristles. Magn. 350 diam. 
