506 W. B. HARDY. 



Myriothela is that of Professor Allmann^ which was published 

 in the 'Phil. Transactions ' in 1875. This was followed by a 

 long monograph illustrated with abundant figures, and pub- 

 lished at Moscow (3) in 1880, unfortunately in Russian, by 

 Korotneff, who was the first to study Myriothela with the aid 

 of properly prepared sections. 



In 1881 Korotneff published a further paper dealing with 

 the same subject (4). A copy of this I have unfortunately 

 not been able to obtain. The further literature of the subject 

 will be referred to as occasion demands in the following pages. 



The work was carried out partly in the Marine Biological 

 Laboratory at Plymouth, and I am grateful for the many kind- 

 nesses experienced there. But the bulk of the work was done 

 in the Morphological Laboratory of Cambridge University, 

 and I would here thank Mr. Sedgwick for placing the resources 

 of his department at my service. 



The general structure of Myriothela will be best learned 

 by reference to Allmann's monograph, and to that I must refer 

 my readers, merely stating here that it is a solitary attached 

 hydranth. The proximal part of the body is usually bent at 

 right angles to the rest, is covered with a thick perisarc, and 

 gives origin to short processes by which it is attached to the 

 under side of large stones. The perisarc of the foot is repre- 

 sented over the rest of the body by a delicate cuticle. Follow- 

 ing on the foot is the middle region of the body, whence spring 

 numerous blastostyles. Each of these bears gonophores, male 

 and female, on its proximal portion, while short capitate ten- 

 tacles spring from the distal extremity. The blastostyles are 

 without a mouth. 



The distal or oral region of the body of the hydranth is the 

 longest, and is studded with very numerous, small, capitate 

 tentacles to within a short distance from the mouth. 



