DESCRIPTION OF THE PLATES. 129 



Fig. 108 (750 diam.). A more bigblj maguilicd egg, h-om fuj. 74. Tlic mulberry-like character 

 of the yolk {vi) is remarkable. 



PLATE X. Fhjures 109 to 129. 



Fig. 109 (1050 diam ). Profile sectiou of the outer wall (oophragraa) of a genital sac, principally 

 to illustrate the relation of the vibratile cilia (co) to the cells of this wall, and the interstitial cytoblas- 

 tema in which the cilia-bases are imbedded. 



Fig. 110 (1050) diam. Surface view of the same as fig. 100, the large pigment and colorless 

 granules lying nearest the observer. From an unusually large individual. 



Fig. Ill (350 diam.). From the same layer as in figs. 109, 110, acted upon by fresh water, which 

 has resolved the elements into separate cells. 



Fig. 112 (1050 diam.). E to K. Vibratile cilia from diverse regions of the interior. E is from 

 the surface of the genital sac {fig. 109), and the rest from the inner face of the circumoral floor, near 

 the margin of the umbella. They are represented in various attitudes, as they move with the cilium 

 in front of the swollen basal portion. 



Fig. 113 (200 diam.). Portion of the proximal face of a peduncular cord, showing the deep fur- 

 rows (i, ^) and the intervening ridges {\). 



Fig. 114 (750 diam.). A small portion of % 113, more highly magnified, showing an apparently 

 clear cellular structure, with large homogeneous interspaces. Its true nature is seen in fig. 116. 

 The tissue is strongly contracted. 



Fig. 115 (750 diam.). Some loosened cells horn fiig. 114. 



Fig. 116 (750 diam.). Showing the fibrillai (;•', Ir", 2;-') and cells of the peduncular cords ; from 

 the same individual ?i& fig. 114, but in a highly extended condition, just after death has ensued. 



Fig. 117 (470 diam.). Transverse section of one of the main subdivisions of a muscular cord of 

 the peduncle, next the median furrow (^) of fig. 113, showing the deep minor furrows. 



Fig. 118 (750 diam.). Profile section of the outer wall of the adherent disk of the peduncle, with 

 its imbedded adherent vesicles (a). 



Fig. 119 (750 diam.). Inner face-view of the same as fig 118, displaying only the cells (/') and 

 the neniatocysts (?) in the distance. 



Fig. 120 (750 diam.). Outer surface view of the same as figs. 118, 119, showing only the crowded 

 colletocysts (a) and the very minute nematocysts (l). 



Fig. 121 (24 diam.). Front view of a very young individual (j\ of an inch across the umbella 

 alone). The different groups of tentacles vary considerably in the number of their components. The 

 numbers 1, 2, 2^ 3, 3», etc., refer to tentacles of successively younger development ; and the capital 

 letters A, A\ B, B", C, C, refer to the groups which have respectively, four, or five, or six tentacles. 

 The tentacular nature of the colletocystophore (a) is quite marked, as yet. 



Fig. 122 (45 diam.). A, B, C, D. Variously developed groups of tentacles and an anchor from 

 fig. 121. Group A, of four tentacles seen endwise. Group B, of five tentacles seen in front. Group 

 C, of six tentacles also seen in front. No. 1 is the oldest and No. 4'' the youngest tentacle of these 

 groups. They are numbered and lettered to correspond with the same inftg. 121. The anchor (D) 

 is seen in profile, fully extended. 



Fig. 123 (85 diam.). An anchor, the same as fig. 122, D, slightly conti'acted. A surface view, 

 showing the interior in the distance. 



Fig. 124. Natural size of a very young animal. 



Fig. 125 (40 diam.). View of the aboral or distal side of a group of tentacles irom fig. 124. The 

 numbers 1 to 0" refer to successively younger tentacles. 



Fig. 12G. Front view of the same as fig. 125, less magnified. 



Fig. 127 (175 diam.). Basal view of part of the adherent disk of the peduncle, of a very young 

 individual {fig. 124). Remarkable for the alirupt termination of the muscular cord (r) and the dis- 

 connected tubes (t'). 



Fig. 128 (175 diam.). Portion of a transverse seel ion of the p.eduucle ofy?^. 124, at a point half- 



17 June, 1878. 



