J. E. Duekden — Jamaican Actiniaria : Part I. — Zoanthece. 



335 



the three Torres Straits species, described by Haddon and Shackleton (1891), 

 compared with those of the West Indies. In all these latter, the proportion of 

 the two parts differs much, the lower or proximal being several times larger 

 than the upper or distal ; in the former, very little distinction in size is met 

 with. In Z. Coppingeri, the proximal (*'. e. upper in figure, which would be lower 

 or proximal in the extended condition of the polyp) is even slightly shorter than 

 the distal ; while in Z. Jukesii and Z. Macgillivrayi, the proximal is but slightly 

 longer. Further, the muscle as a whole is much less developed than in the 

 Antillean examples. 



In partial cod traction, a deep circular depression denotes externally the place 

 of division between the two portions of the sphincter muscle. I use the term 

 ' capitular fossa' fortius, and speak of the two parts as the inner and outer capitula. 



The genus Zoanthus, so far as I have observed it in the abundance occurring 

 in Kingston Harbour and the Port Royal Cays, appears restricted in its 

 distribution to a narrow belt of shallow water around the shores. It contrasts 

 very markedly, not only in colour and firmness, but in its distribution with the 

 equally abundant genus Palythoa. Colonies of the latter commence where the 

 former begins to disappear, being most vigorous in the upper region of the 

 breakers around the reefs. On the windward, more rocky side of the Cays, a 

 distinct Zoanthus zone can be distinguished from the Palythoa zone ; the 

 former extends to a depth of one or two fathoms, and the latter to three or 

 four fathoms, and gives place in its turn to the zone of living coral. 



Zoanthus Solandri, 

 Zoanthus dubia, . 

 Zoanthus Solanderi, 

 Zoanthus dubius, . 

 Zoanthus Solanderi, 



Zoanthus dubius, . 



Zoanthus (Rhysanthus) Solandet 

 Zoanthus (Ehysanthus) dubius, 



Zoanthus Solanderi, Lesueur. 



(PI. XVII. A, fig. 1.) 



Lesueur, 1817, p. 177, pi. vm 



Lesueur, 1817, p. 177. 



Milne-Edwards, 1857, p. 300, pi. c2, fig. 3. 



Milne-Edwards, 1857, p. 300. 



Duchassaing and Michelotti, 



pi. vm., fig. 1 ; 1866, p. 135. 

 Duchassaing and Michelotti, 



pi. vm., fig. 2 ; 1866, p. 135. 

 ii, Andres, 1883, p. 327. 

 . Andres, 1883, p. 329. 



fig. 1. 



1860, p. 325, 

 1860, p. 326, 



Form. — Polyps erect, cylindrical, smooth, thin-walled with lines of attachment 

 of mesenteries showing through, connected with one another at the base by 

 lamellar narrow ccenenchyme or free stolons, or may be solitary. Column usually 



