﻿THE COASTS OF RHODE ISLAND AND NEW JERSEY. 151 



The genus Gepon was first described by Duvernoy, in the fifteenth volume of the 

 An. des Sciences Naturelles, but the individual he indicates as being the male of 

 Gepon typus is evidently the female of another species. Gepon distortus is not a very 

 abundant parasite, for after having accidentally found a specimen, in searching for 

 others, I destroyed fifty fidler crabs without obtaining a second. The parasite produces 

 no deformity, visible externally, of the animal it infests. The male was found in 

 the embrace of the female, as commonly observed in the isopodous Crustacea. 



In making out the foregoing list of Crustacea, I have availed myself of the aid of 

 Dr. Bridges' knowledge of this class of animals. 



CIRRIPEDIA. 



83. Anatifa striata, Brug. 84. Anatifa l^evis, Brug. 



85. Anatifa dentata, Brug. 



86. Balanus balanoides, Stimpson. The four species of cirripeds have been ob- 

 served at Point Judith, Atlantic City, and Beesley's Point. 



RADIATA. 



87. Asteracanthion rubens, Mull, et Trosch. Very abundant at Point Judith. 



88. Echinus granulatus, Say. Abundant at Point Judith. 



REFERENCES TO PLATES X. AND XI. 



Fig. 1. — A branch of Eucoryne elegans, the size of nature. 



Fig. 2. — Eucoryne elegans. A portion of a stem with three branchlets and polypes, a, young bud; 



b, medusa bud fully developed ; c, young medusa bud. Magnified. 



Fig. 3. — A polype of Eucoryne elegans, with two fully developed medusa buds (b) and a young one (c). 

 Fig. 4. — Eucoryne elegans. Extremity of one of the filiform tentaculas with the filiferous cells (a) placed 



inferiorly and at the tip, and with an axis of large nucleated cells (c). Highly magnified. 

 Fig. 5.— Eucoryne elegans. Extremity of one of the superior tentaculas with the globular end filled with 



filiferous cells (a), a few of which (b) are represented as separated and with their threads ejected. 



c, central axis of large nucleated cells, surrounded with muscular fibres and a ciliated epithelium. 

 Fig. 6. — A filiferous cell of the Hydra, resembling those of Eucoryne. Highly magnified. 



Fig. 7. — A filiferous cell of the Hydra, with the style and thread emitted. 

 Fig. 8. — Two styliferous cells, highly magnified, from the tentaculse of Laomedea. 

 Figs. 9 — 16. — Filiferous cells of Astrangia astrseformis, highly magnified. 

 Fig. 9. — Filiferous cell with a style; from the tentaculas. 



Fig. 10. — Filiferous cell with a style ; from the white cords of the interior of the body. 

 Figs. 11, 12. — Filiferous cells; from the white cords. 



Figs. 13, 14. — The same as figs. 11, 12, with the apparent structure of the partially emitted thread. 

 Figs. 15, 16. — Filiferous cells, with the thread partially and the style entirely emitted, exhibiting their ap- 

 parent structure. 

 Figs. 17 — 21. — Filiferous cells, from the interior white cords of the body of Actinia marginata. 

 Figs. 17, 18. — Filiferous cells with styles. 



Fig. 19. — One of the varieties of filiferous cells with the thread and style emitted. 



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