HIPPOPODIUS. 55 



The substance of the nectocalyces has a semicartilaginous consistence. Their number 

 amounts to as many as twelve. The lowest are the largest, and new ones are constantly 

 budding forth at the upper end of the series. 



The nectocalyces of opposite sides are wedged together by their inner faces — each one 

 receiving the end of its opposite neighbour and the lower surface of that which lies above it. 

 between the ridges of that face. The apertures of the nectosacs of the two lowermost 

 nectocalyces alone are uncovered, the rest being hidden by the upper surface of the nectocalyx 

 below them. As usual, there is a muscular valve, which is narrower below than above. 



The axis of the cone formed by the nectocalyces appears to be, as it were, a branch 

 from the upper end of the cocnosarc ; but, from Leuckart's observations, it results that this 

 apparent branch is, in reality, merely the upper end of the cocnosarc bent down upon itself: 

 for, in the youngest individuals, which may not have more than two nectocalyces, the 

 arrangement of the parts is just as in Diphyes or Abyla. The ccjenosarc gives off a series of 

 nectocalycine ducts, one below the other, along the same lateral line ; though, in consequence 

 of the position of the nectocalyces, they appear to be right and left. 



The extended cocnosarc sometimes measures full six inches, and bears twenty or thirty 

 well-developed groups of organs, besides the numerous buds which remain inclosed within 

 the cone formed by the nectocalyces. 



The tentacles are like those of the other Calycop/iorida. Ilippopodius is monoecious, 

 and the gonophores are remarkable for the brevity of their gonocalyces and the length 

 of their manubria. The genus has not hitherto been taken beyond the limits of the 

 Mediterranean. 



