HYDROZOA, SCYPHOZOA, ACTINOZOA, VERMES WHITELEGGE. 385 



an irregular crenated margin. The zooids are not sufficiently well 

 preserved to afford accurate internal structural details. 



The spines near the apices of the pinnules are short and some- 

 what triangular ; below they are elongate and subcylindrical, with 

 smooth, acute, abruptly tapering summits. They are arranged in 

 longitudinal rows and frequently exhibit a spiral arrangement 

 running from right to left ; five rows maybe seen from one aspect, 

 four of which are included in the spiral arrangement. Many of 

 the spines on the stouter pinnules are given off at right angles, 

 generally they are slightly inclined upwards, their length is about 

 0'3 mm., and measured from apex to apex in a spiral 0-4 mm. apart. 



This species is allied to A. tristis and A. atlantica. 



SUB-CLASS ZOANTHAKIA. 



BY J. P. HILL, B.Sc., F.L.S., AND T. WHITELEGGE. 



FAMILY ZOANTHID^E. 



ZOANTHCS FUNAFUTIENSIS, Sp. nOV. 



(Plate xxiv., figs. 2, 3). 



Form. Body-wall smooth, translucent, surface transversely 

 wrinkled when contracted. Coanenchyme thin, encrusting, con- 

 tinuous or becoming stoloniferous at the margin. Column short, 

 often broader than high. Capitulum slightly expanded, with from 

 45 to 50 ridges, confined to the upper swollen surface. Oral cone 

 a little prominent, aperture longer than broad. Tentacles 24 to 

 28, similar, arranged in two cycles. 



Colour. The specimens were preserved in formol, and when 

 received were of a bright grass green. The colour has now faded 

 entirely, and the colony is greyish with slight tinge of olive. 



Dimensions of colony 8 '5 by 4 '7 cm. ; height of an average- 

 sized polyp 5 mm., diameter of the capitulum 5 mm., of the 

 column 3 mm. 



ANATOMY. 



Body-wall (Plate xxv., fig. 1). The body-wall is bounded ex- 

 ternally by a cuticle to which stray diatoms and sponge spicules 

 are found adherent. Between the cuticle and the ectoderm is a 

 thin peripheral layer of mesogloea, consisting of fine anastomosing 

 strands, and having a thickness of '003 mm. The ectoderm is a 

 thin continuous layer in which cell outlines are not recognisable. 

 It is crossed here and there by fine strands from the mesoglcea, 

 which unite to form the peripheral layer as described by Haddon 

 and Shackleton in Z. coppingeri.* 



* Reports on the Zoological Collections made in Torres Straits : Actiniae, 

 i. Zoanthete Sci. Trans. R. Dublin Soc. (2), iv., xiii., p, 677. 



