mi. 



amined, appears single, shines through the carapace, and at 

 the sides of the latter, two coiled tubes with clear com- 

 the so-called shell-glands, are seen. 



Four distinct and movable somites succeed the carapace, 

 and gradually diminish in diameter. The body then sudd 

 enlarges, and becomes divided, in the female, into four seg- 

 ments, the last of which gives attachment to two long setose 

 styles, which possibly represent another somite. There is a 

 well-developed and prominent labrum (or conjoined epistoma 

 and labrum) in front of the mouth, and behind it is a bilobed 

 metastoma. The first pair of appendages are the long and 



FIG. Qb. Cyclops. Side-view of an adnlt female carrying a pair of ovisace, and ven- 

 tral view of the head, showing the lubruin. BMUSUMU :ind appendapea of the left 

 Bide. 1', eye ; II', anti-iuiul.- ; III. antrima : IV. mandible; V. tlr-t maxilla; 

 VI', second maxilla (erroneously marked YIl'i ,/. outer; t>, inner division ; 1. 2, 

 8, 4, 5, thoracic limbs ; A', rostrum ; l>>, labrum ; ml, metaetoma. 



many-jointed antenmtles, which are the chief organs of loco- 

 motion. Those are succeeded by the short and few- jointed 

 antennae. The third pair of appendage*, <>r first pair of gna- 

 thites, differ from the corresponding- limb in l/naulus in the re- 

 duction of the greater part of the npp<'n<l:iir<> to a rudiment 

 terminated by setae, while the strong basal part is tin- princi- 

 pal gnathitc or inwufiMr. The second pair of trnathite's are 

 strong and incurved ; following upon these is a third pair of 



