62 Anatomy of Sagartia Schilleriana [No. 1, 



Explanation of Plates. 



Plate X, (p. 33). 



Fig. 1. Unfolded specimen of Sagartia Schilleriana, in natural size (see 

 p. 33) ; 1 a, a portion of a tentacle of the second series ; 1 b, a portion of 

 a tentacle of the first series, both enlarged twice the natnral size ; 1 c, 

 termination of a primary tentacle, with the cnidce arranged in spiral 

 rows, six times the natural size ; 1 d, longitudinal section of one tentacle, 

 shewing the different layers of which it is composed, (p. 39). 



Fig. 2. Top-view of the specimen represented in fig. 1, when in a half 

 contracted position, (p. 34). 



Fig. 3. Side-view of the same, with the ovaria visible through the trans- 

 parent body, the tentacles half protruding, and several acontia ejected. 



Fig. 4. Side-view of the same specimen in a fully contracted position, the 

 transverse rugations being more distinct than in the former positions, 

 (p. 34). 



Fig. 5. View of the basis ; numbers 1-5 shewing the 5 series of the septa ; 

 the dark spots, each situated on either side of the primary septa, 

 represent the ovaria, and the striped marks, more centrally situated, the 

 bundles of the craspeda, (p. 35.) 



Figs. 6 — 9. Side-views of the various abnormal forms of the same specimen, 

 (p. 50). 



Plate XI, (p. 35). 

 Fig. 1. View of a specimen turned inside out, the primary septa and the 



ovaria accompaning them being prominent, (p. 50) ; 1 a, represent three 



shrunken tentacles, enlarged. 

 Fig. 2. Ideal representation of the distribution of the septa and tentacles 



according to the different circles (p. 40). 

 Fig. 3. Ideal perpendicular section of a Sagartia, in half of its basal 



diameter, (see explanation of the various letters on p. 35). 

 Fig. 4. Appearance of the mucous layer, enlarged 200 diameters ; 4 a, a few 



isolated cnidce, enlarged 500 diameters (see p. 36). 

 Fig. 5. Upper or outer view of the scleroid tissue ; 5 a, the internal view 



of the same ; 5 b, calcareous scleroids ; 5 c, siliceous scleroids, very 



much enlarged, (p. 37). 

 Fig. 6. A portion of the scleroid skeleton, after the specimen was burnt in a 



crucible (see p. 38). 

 Fig. 7. Cnidce of the tentacles (p. 40). 

 Fig. 8. Longitudinal section of a portion of a craspedum, and 8 a, its cnidce, 



more enlarged (p. 43). 



