SOME KARE AND INTERESTING SEA ANEMONES FROM PLYMOUTH. 65 



together on the upper third, but scarcely ever contiguous. Disk narrow, 

 mouth pouting. Tentacles 16, obtuse, wrinkled, contracted to a length 

 of 3 mm. 



All specimens likewise agree with the figures and description of Andres, 

 and the plate given by Delage and Herouard in Zoologie Concrete. The 

 colouration of this species is evidently extremely variable to judge by 

 the figures and descriptions of Andres in UAttinie. 



Anatomy. — ^Transverse sections of the two British and an Italian 

 example revealed practically identical characters, (b) was strongly 

 contracted and somewhat injured and gave very indifi'erent results 

 when sectionized. Sections showed the cuticle and a thick but irregular 

 ectoderm (Fig. 2) ; the mesogloea of the column wall is comparatively 

 thin in the capitular region, but becomes very dense and much thicker 

 toward the physa end ; the warts consist of outgrowths of the mesogloea 

 and are frequently hollow, being then capped by a thin layer of mesogloea 

 and ectoderm. All eight mesenteries are fertile ; the retractor muscle 

 is large and the basal muscle comparatively small in the region bearing 

 the gonads ; lower down, the retractor becomes smaller, and the basal 

 muscle larger, and in the region of the physa the two are of about equal 

 size. The folds of the basal muscle are about twenty in number on each 

 side and are often bifurcated, the proximal fold gives ofi numerous small 

 branches on its outer edge ; the folds are long and slender and lie practi- 

 cally at right angles to the central strand of mesogloea, which appears in 

 section as a fairly stout rod, branching out at its distal end. The longi- 

 tudinal retractor muscle is reniform in section, but the folds are not as 

 stout nor have they the peculiar moss-like appearance seen in E. timida ; 

 they are fairly slender, very much branched, and are from fifteen to 

 twenty in number. We are indebted to Mr. F. S. Wright for a figure of 

 this Anemone in the living condition (Fig. 1). 



III. Halcampa chrysanthellum, Peach. 

 Originally described by Peach and Gosse from Cornish specimens, 

 and regarded as the only British species until Haddon discovered 

 H. arenaria in S.-W. Ireland in 1885 and 1886. As the two species bear 

 a considerable external resemblance it is more than likely that there 

 has been some confusion in identification. Haddon identified specimens 

 from the East of Ireland as H. chrysanthellum, with certain anatomical 

 characters, but he pointed out that, until specimens from the original 

 Cornish locahties had been examined anatomically it would be unsafe 



NEW SERIES. — VOL. X. NO. 1. XOVEMHEi:, 1913, E 



