298 J- Playfair McMubrich, 



The similarities wliich this form presents to Cablgken's E. pata- 

 goniclms indicate its identity, notwithstanding tlie much greater 

 size of the individuals of the Single colony whicli Carlgeen examined. 

 Length, however, seems to have comparativelj^ little importance as 

 a specific cliaracteristic in the Zoantharia. 



Genus Parazoanthtis Hadeon et Shackleton, 1891. 



Macrocneminae with the polyps arising independently from an ex- 

 panded coenenchyme ; column wall incnisted with foreign particles; 

 sphincter endodermal, diffuse ; a more or less distinct ring sinus occurs. 



27. JParazoanthus eloju/attis n. sp, 



No. 242. Calbuco. Several colonies. 



The coenenchyme is rather sparse and incrusts or completely 

 encloses the stems of hydroids. The polyps arise from the coenen- 

 chyme either singly (Fig. 87, A) or in groups (Fig. 87, B) and are 

 elongated and club-shaped; like the coenenchyme they are incrusted 

 with particles of fine sand. 



The fully growu polyps measure in the contracted condition 

 about 1.7 cm in height, the height of those measured varying between 

 1.5 and 2.0 cm. The diameter of the column at the summit was 

 from 0.3 to 0.4 cm and at the line of union with the coenenchyme 

 from 0.20 to 0.25 cm. The colour of the preserved individuals was 

 Sandy, but, an accompanying label states that in life they were 

 "grau-gelb, Mundscheibe und Fühler weiss". 



Structure. The ectoderm is proAdded with a cuticle and is 

 almost as thick as the mesogloea. The incrustation is very moderate 

 and involves only the outer half of the mesogloea which contains 

 cell-islands and scattered lacunae ; the ring sinus is very imperfectly 

 developed, consisting of some larger transversely elongated lacunae, 

 lying close to the endodermal surface of the mesogloea (Fig. 88) and 

 separated from one another by considerable intervals. The sphincter 

 (Fig. 89) is very weak, consisting of rather low, almost unbranched 

 and scattered mesogloeal processes. 



The ectoderm of the tentacles and disc is very much thicker 

 than the mesogloea, which appears as a mere line in sections and 

 is homogeneous in texture. The ectodermal muscle processes are 

 hardly developed. 



