154 PROr. ALLMAX ON NEW HYDROIDA FROM 



everted teeth on each side, and a single long tooth-like process 

 springing from the middle point of the back ; mesial nematophore 

 adnate to the hydrotheca-walls for their entire height, then 

 forming a free laterally compressed process which bends upwards 

 at a right angle, carrying on its posterior edge an elevated round 

 orifice, and ending in a long pointed spine ; lateral nematophores 

 pyriform, with the upper edge of the orifice continued into a long 

 horn-like spine. 



Cronosome not known. 



Locality ? 



This is a very remarkable species. It attains a height of about 

 4 inches, and is rendered especially striking by its singularly 

 shaped mesial and lateral nematophores. The round orifice, 

 raised on the summit of a papilliform projection of the posterior 

 edge of the mesial nematophore, must, I believe, be regarded as 

 indicating the true summit of the nematophore, its spine-like 

 continuation beyond this point being apparently imperforate. 

 Just below this orifice is a small tooth-like process, which is 

 given oiffrom the nematophore on a level with the margin of the 

 hydrotheca. The lateral nematophores are also continued each 

 into a long slightly curved spine, which gives to the hydrotheca 

 when viewed in front the appearance of being surmounted by 

 two long horns. It is generally, however, only towards the distal 

 extremit}'^ of the pinnge that these horn-like spines can be seen 

 in perfection ; near the base of the pinnae they appear to be 

 stunted or broken off. 



In the absence of a gonosome, the reference of this species to 

 Halicornaria is provisional. 



Lttocarpus, 



Lttocarpus ramosus, n. sp. (PI. XXV. figs. 1-3.) 

 Tropliosome. — Stem fascicled, much and irregularly branched. 

 Hydrothecge deep, somewhat ventricose, margin with about nine 

 strong teeth, intrathecal ridge a little below the middle of the 

 hydrotheca ; mesial nematophore adnate to about the lower 

 three fourths of the hydrotheca, and then extending as a free 

 strong spine to a level with the margin ; lateral nematophores 

 slightly overtopping the hydrotheca. 



Gonosome. — Phylactocarps develojDed at irregular intervals 

 along the branches, and consisting of a rhachis with about thirty- 



