Gatty Marine Laboratory ^ St. Andrews. 297 



enlarged ends of tlie shafts and tapered terminal pieces with 

 serrations. A female bore ova of considerable size in July. 

 Mystkh's limhaia, De St. Josepli, was obtained by Southern 

 off tlie west coast of Ireland and at Plymouth by Allen. 

 It is a small form, the head bearing four minute tentacles in 

 front and two large reddish eyes posteriorly. The buccal 

 segment has two slender tentacular cirri, and the following 

 segment has another pair, the ventral presenting a slight 

 enlargement. The proboscis has a ring of about ten papillae, 

 and its inner surface is coated with large conical papillae. 

 The anal segment has a pair of fusiform cirri. The foot has 

 oval dorsal and ventral cirri and a bitid setigerous lobe. 

 The short stout bristles are curved, and the distal end of 

 the shaft has a strong tooth and a series of spines on each 

 side. The terminal blade is coarsely serrated and obliquely 

 striated. Mature specimens have swimming-bristles. 



Southern distinguishes it by the fan-shaped array of spines 

 at the end of the shaft of the bristles (a feature, however, 

 found in other forms), and by the winged expansion of the 

 ventral tentacular cirrus on the second segment. Allen ob- 

 serves that a female with dark green eggs occurred in May, 

 and that a small median tentacle exists as in Eulalia, " but 

 in the majority of specimens it is difficult if not impossible 

 to make it out." 



De St. Joseph points out that certain Phyllodocids, such as 

 Eulalia problema, Mgrn., have capillary bristles as in Syllids, 

 and that Eulalia gracilis,Y erfiW, showed signs of scissiparous 

 development. The presence of large eyes and capillary 

 bristles in M. limbata is another example, and he thinks it 

 probable that at maturity these will be fully developed as 

 swimming-bristles. Gravier, however, found females with 

 much-developed eggs in w!)ich these bristles were dis- 

 appearing. 



Mystides bidenta/a, Langerhans, also occurred on the west 

 coast of Ireland (Southern). The head is elongate, and the 

 tentacular cirii long. The body has about 190 segments, 

 and measures from 5-25 mm., the colour being greenish 

 yellow, and a dark brown spot exists at the base of each 

 foot ventrally. The anal segment has two slender cirri 

 enlarged at the base, and a long papilla between them. 

 The feet have ovate cirri, and the setigerous lobe is bifid. 

 Tiie ventral bristles are thicker than the median, 

 and the terminal pieces shorter ; dorsal bristles inter- 

 mediate. The dilated and bevelled tip of the shaft bears 

 two unequal claws, and is spinous. The bristles are longer 

 and more slender than in M. limbata, and the ventral ciiri 



