218 Rev. T. Hincks on the 



M, spiynfera, from which it differs in many important parti- 

 culars. Omitting the differences in the number and character 

 of the spines and the disposition of the zooecia (though these 

 are sufficientlj distinctive) the structure of the cell itself is 

 quite dissimilar in the two forms. In the present species the 

 zooecium is short, massive, enclosed by comparatively high 

 walls, and furnished with a solid calcareous floor (PI. XV. 

 fig. 4 a) . The lower portion of the aperture is covered in by 

 a calcareous lamina *. In these points it presents a contrast 

 to that of M. sinnifera. Another striking feature of M. cym- 

 hiformis is the tall pedicellate avicularium. There are com- 

 monly two of these appendages on a cell placed one on each 

 side. At the top of the cell there are usually three tall 

 spines. 



This form was described as long ago as 1877 f? but no 

 figure accompanied the description. It seemed desirable to 

 supply one, as Smitt's figure, though strictly accurate as far 

 as it goes, is on too small a scale and does not show some of 

 the important characters. 



M. cymhiformis seems to be abundant in the northern seas. 

 In the St. Lawrence it occurs in small patches incrusting 

 Hydroids and Polyzoa. 



Range. Northern and Arctic seas (18-60 fath.). [Kara 

 Sea, on Sertularia and Algffi (Levinsen) ; Jan Mayen, on 

 Afcyom'dhwi and Pycnogonida3 {Lorenz).^ 



Family Escliaridae (part.), Smitt. 

 ESCHAROIDES, Smitt [ = Eficharopsis^ Verrill:|:). 

 Escharoides ^ Sarsii, Smitt. (PI. XIV. figs. 1.) 



Cellepora cervicornis, var., Sars, Reise Lofoten ogFinmark, p. 28 (sep.). 

 Eschara rosacea, Sars, Beskr. N. Polyzoa, 1862, p. 3 (sep.). 

 Eschara Sarsii, Busk, Liun. See. Journ., Zool. xv. 

 Escharopsis lobata (Lamx.), Verrill, Proc. U. S. Nat. Mus. 



This interesting form has been investigated by M. Sars 



* This character was correctly given by Prof. Smitt, but escaped my 

 notice, and was not included in my description. 



t "Polyzoa from Greenland and Labrador," Ann. & Mag. Nat. Hist, 

 for January 1877. The species credited in this paper (through a mistake) 

 to Iceland were really obtained in Davis Straits. 



t Bull. Nat. Mus. U. S. no. 15, p. 149 (1879). There seems to be 

 hardly sufficient reason for superseding the n'ame adopted by Smitt for 

 this group from Milne-Edwards, an<i^vhich has found its way into general 

 use. It has been employed by Busk in his ' Challenger ' Keport. 



§ Smitt, in one of his later papers ('' Bryoz. of Novaja Semlja," 1878), 

 has referred this species to his genus Discojwra, a group which is com- 



