Order Lucemarice. 535 



eel to the partitions, where they become continuous with 

 the muscular layer of the oral side of the disc : organs of 

 generation dioecious ; they occupy the same position in the 

 male as in the female, and have the same general structure 

 in both, which consists of saccules attached to the inner 

 wall of the oral side of the disc, and arranged more or less 

 closely together, so as to form variously shaped groups or 

 bands; each individual has eight of these bands, every 

 two of which constitute the halves of a single genital, and 

 are either separate from each other, or united across the 

 axial end of a partition, so as to form a U-shaped organ, 

 the two limbs of which extend in a greater or less degree 

 toward the groups of tentacles or the intertentacular mar- 

 gins ; the convex edge of the U is bordered by one or more 

 rows of ligulate, digitiform, or filamentary bodies, which ex- 

 tend from the inner or proximal end of the septal region, 

 either one third, one half, or even along the whole length 

 of the genitals ; of each ligulate filament, at least in Hali- 

 clystus auricula, the side which faces toward the band 

 which it borders, is covered, like the whole of the general 

 cavity, with vibratile cilia, and on the opposite side there 

 are no cilia, but a layer of closely set adhesive vesicles 

 identical in structure with those on the anchors and in 

 the base of the pedicle ; lasso-cells are also numerous on 

 the ciliated side, and all around the end of the filament. 



Families of the order LUCERNARIiE. H. J. C. 



1st. — Family. CLEISTOCARPID.E. H.James-Clark. 



The neighboring halves of adjoining genitals approxi- 

 mate each other and unite at their distal ends opposite the 

 corners of the quadrate mouth and extend to or toward 

 the four intertentacular mararins which alternate with the 

 partitions ; the approximate genital halves, from their axial 



