LEPTOSCYPHUS TENUIS. 197 



which the fixed-poly pite element is wanting, and the ova 

 give origin directly to the medusa or natatory polypite ; 

 and Allman proposes to retain Forbes' s name for this type. 

 The tentacles of the free zooid of Leptoscyphus probably 

 increase in number with age, until each of the eight mar- 

 ginal bulbs bears a cluster of them (Woodcut, fig. 22) *. 



Fig. 22. 



Uzzia grata (A.. Agass.) 



In the Lizzies observed by Sars and Forbes, gemmation 

 took place from the walls of the manubrium. 



Leptoscyphus is placed in a distinct family on account of 

 the remarkable peculiarities of its gonosome. 



L. TENUIS, Allman. 



LAOMEDEA TENUIS, Allman, Ann. N. H. for Nov. 1859. 



LEPTOSCYPHUS TENUIS, Allman, On the construction and limitation of Genera 

 among the Hydroida, Ann. N. H. for May 1864. 



Plate XXXIV. fig. 2. 



ZOOPHYTE minute ; STEM geniculate, distinctly annulated ; 

 HYDROTHEC^: with a deeply cleft margin, borne on ringed 



* The woodcut represents an adult Lizzia : the interradial clusters are 

 smaller than those at the extremity of the radiating canals. 



