12 G. O. Sars. 



scarcely to admit of being counted, several pairs being 

 attached to each segment. Whereas the anterior 12 —14 

 pairs are covered by the carapace, the posterior pairs are 

 wholly uncovered, forming a dense fringe on each side of 

 the exposed part of the body. The hindmost pairs, how- 

 ever, are so small as not to project laterally, and they are 

 only visible on viewing the animal from the ventral face, 

 when they are seen to terminate the dense, conically tapered 

 crowd of legs. 



Development. — The eggs contained in the mud re- 

 ceived seem to have been rather numerous, but they were 

 not easy to detect, owing to their being so thickly coated 

 with argillaceous matter as to look merely like small mud- 

 particles. I have, however, once succeeded in observing 

 such an egg at the moment of hatching (see fig. 8). It 

 burst on one side, and from the opening a clear bladder 

 was seen to project containing the fully-developed red- 

 coloured Nauplius, which moved rather energetically within 

 the capsule. Pig. 9 represents this hyaline capsule, with 

 the enclosed Nauplius in a lateral position, after being- 

 separated from the egg-shell, and fig. 10 the just hatched 

 Nauplius, viewed from the ventral face. Its length in this 

 1st free stage somewhat exceeds half a millimeter. Of 

 limbs there are present only the 3 usual Nauplian appendages, 

 all belonging to the head, viz., the antennulæ, the antennæ 

 and the mandibular legs, arranged around the exceedingly 

 prominent labrum. The posterior part of the body is quite 

 simple, oval in form, and without any appendages or pro- 

 jections, though a faint transverse striation is visible on 

 each side as the indication of an incipient segmentation. 

 In front of the labrum the simple eye, or ocellus, is fairly 

 distinguishable, but of compound eyes no trace is as yet to 



