124 DESCRirTION OF THE PLATES. 



umbclla thrown forward and so contracted at the periphery as to form a deep funnel. Figg. 8 to 

 12, half-grown. individuals in various attitudes. Fig. 13, a specimen clinging by its anchors to a 

 leaf of Zostera. Figs. 14 and 15, the uudx-lla strongly enrolled at the margin. Fig. 16, profile of 

 a very young specimen. 



Fig. 17. A magnified profile view of a nearly full-grown individual. To avoid confusion only 

 the four nearest bunches of tentacles (t) are represented. Only the aboral side (lO) of the unibella 

 is e.x-posed. The anchors fa) arc thrown strongly back over the edge of the umbclla. The tentacles 

 (t) ou the left are expanded to the fullest extent. 



e 



PLATE II. Fli/nres 18 to 24. 



Fig. 18. Posterior face of the caudal disk, magnified 15 diameters, to show the four main fur- 

 rows (y') and the network of minor furrows. 



Fig. 1 9. Interior face of caudal disk, the peduncle being cut across just in front of it and removed. 

 Principally to show the passage-ways between the four camera; (r') and the convergence of the four 

 muscles (/•') to the axis. 



Fig. 20. Oral face of a young specimen /j of an inch across the umbclla, magnified 24 diameters. 

 The pro))ORcis (p ) being strongly contracted appears disproportionately small, l)ut possesses the 

 advantage of exposing the proximal ends of the partitions (4-) of the umbella, as well as of the geni- 

 talia (x). 



Fig. 21. Aboral view of a group of tentacles of fig. 20. 



Fig. 22. Magnified (5 diam.) oral face of a full grown specimen. Only two bunches of tentacles 

 (■?) are represented. On the left, above, the proximal end (4^) of the partition and the attachments 

 of the digituli (>;) are exposed by tlie retraction of the side of the proboscis near them. At the 

 other three quadrants the circumoral pouches arc widely covered by the extended flanks (f) of the 

 proboscis. The four double genitalia lie, both above and below, right and left of the vertical plane, 

 a partition (4°) lying in the middle of each pair. The three sides of a triangular genital-half arc 

 lettered respectively >,', %-, %'. The anchors (colletocystophores) (o) are in varied positions ; mostly 

 turned strongly backward over the umbollar margin (4.'), two partly reverted, and one projecting 

 straight out so as to fully expose its anterior face with its median furrow. The tentacles (?.) are 

 fully extended. 



Fig. 23. Lateral view of an adult anchor (^coUeiuajstopJwrc) with a part of the umbellar margin 

 (magnified 15 diameters). 



Fig. 24. Front of basal region of a cnUctocijufopJiore principally to show depth of median furrow 

 (a''), and the proportions of the stem (a') and the colletocystophoric pad (a') (15 diam.). 



PLATE III. Figures 25 to 37. ; 



Fig. 25. Basal front view (magnified CO diam.) of the anchor, and a part of the umbellar margin 

 of a specimen about two-thirds grown. Tlie anchor is here shown to be supported on its distal side 

 by a prolongation (,3') from the aboral side (/3) of the umbella. The colletocystophoric pad (a') is 

 strongly dotted by colletocysts. The remnant of the tentacle-like stage is quite distinct {a\ a') in 

 the distance. 



Fig. 2G. Magnified (200 diam.) outline profde of a collclocijd (anchor) from a young specimen 

 {fig. 28) only -„\ of an inch across the umbella. 



Fig. 2t. Anterior face of fig. 2f), the tentacular character still strongly marked (o% a^ o'). and 

 the eye-spot (0) very distinct. 



Fig. 28. Young specimen, natural size, from which figs. 2G, 27 were taken. 



Fig. 29. Natural size of a young specimen (| of an inch across the umbella), from which /as. 30, 

 31, 32, and 33 were taken. 



Fig. 30. Posterior face of a coUHociislopliorc (anchor) retarded in growth, probably by an injury 

 oa that side of the Iwdy. From fig. 29. As yet it is strongly tentacular in proportions and nature, 



