54 THE OCEANIC HYDROZOA. 



Fam. HIPPOPODIID^. 



Genus HIPPOPODIUS {Quoy scad Gaimard). 



The nectocalyces are numerous, horse-shoe shaped, smoothly convex on their inner faces, 

 and form a double series along the (deflexed) proximal end of the ccenosarc. 



H. GLEBA. PI. XII, fig. 6. 



Gleba hippopus, Forskal, 1775. 



— excisa} Otto, 1823. 

 Hippopodius luteus, Quoy and Gairaard, 1827. 

 Hippopus excisus, Delle Cliiaje. 

 Protomedea lutea, De Blainville, 1830. 

 Stephanomia hippopoda, Quoy and Gaimard, 1833. 

 Elephantopes Neapolitanus, Lesson, 1843. 

 Hippopodius Neapolitamcs, Kolliker, 1853. 



— luteus, Vogt, 1854. 



— gleba, Leuckart, 1854. 



I have not observed this or any other member of the genus Hippopodius, but, in order 

 to give completeness to my account of the Calycop/iorida, I subjoin an abstract of Leuckart's 

 description of it, referring to his and the other works just cited for further details. 



Each nectocalyx is shaped like a horse's hoof, vs'ith its lower face turned upwards. 

 It is a wedge-shaped bevelled segment of a cone, in which may be distinguished an upper 

 surface which forms an angle with the longitudinal axis of the cone formed by the union 

 of all the nectocalyces, a less inclined lower surface, and a horseshoe-shaped lateral surface. 

 The upper face is turned towards the axis, and is provided with a deep longitudinal groove 

 with strongly produced edges, which end below and internally in two obtuse processes, 

 between which is a rounded projection. The lower, smaller, face of the nectocalyx exhibits a 

 large circular aperture which leads into a flat nectosac. At the anterior edge (or that turned 

 away from the axis) of the nectosac the ridge between the lower and lateral or anterior face of 

 the nectocalyx is raised up into four well-marked prominences, which are separated by 

 concavities, and die away superiorly upon the anterior surface of the organ. The upper edge 

 of this surface also shows one median and two lateral prominences, which correspond with the 

 intervals between the prominences of the lower edge. 



' Thougli Forskal only figures the animal he discovered. Otto, who adopts his genus, gives not only 

 a figure but a description of the nectocalyces. Ought not the genus therefore to be termed Gleba ? 



