400 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1885. 



The examples described came from the folio-wing locality. That from the Station. 

 2352 is the same as far as the organs are present : 



ANTERIOR NEOTOCALYX. 



(Figs. 1,2, and 3.) 



The anterior nectocalyx measures 30™™ in length and 10™*° in breadth. 

 When seen from the side the thickness is 7™™. 



Two faces may be distinguished, an anterior (Fig. 1), and a posterior 

 (Fig. 2). The cavity of the nectocalyx [cav.) lies under or deeper than 

 the anterior face; the somatocyst (sm.) under the posterior face. Ex- 

 ternally these two faces may be distinguished as follows : The anterior 

 face (a.) has a rectangular shape, and from it the anterolateral faces 

 {al.) slope off on either side, while on the lower sloping face an entrance 

 {cav.) into the bell cavity {cav.) Fig. 3 can be seen. The central portion 

 of the walls of the posterior face (Fig. 2) rises in a prominent cubical or 

 spherical body (2>.), 6™" in length by 5""° in breadth, in the center of 

 which lies the cavity of the somatocyst {sm.). 



Between the lower edge of this projection and the lower rim of the 

 nectocalyx there is a triangular opening {y.) into which tits the anterior 

 projection of the distal nectocalyx. 



The anterior face («.), («w.), (o/.) is made up of five planes. A rectan- 

 gular anterior j^lane {a.) bounded by four ridges, extending about 7™"^ 

 in length and 2™™ in breadth, occupies the medial portion of the face. 

 On the upper side it forms one side of a hexagonal surface which occu- 

 pies this end of the anterior nectocalyx {au.). The hexagonal plane 

 may be called the upper plane of the anterior nectocalyx. Of the five 

 remaining sides of the hexagon two adjacent sides are the upper bound- 

 ing lines of the anterolateral surfaces («7.), two others are the posterior 

 lateral surfaces (p^.), and the side of the hexagon opposite the upper 

 bounding line of the anterior rectangle, in the upper bounding line of 

 the anterior face of the nectocalyx. 



On each side of the border of the anterior rectangle is likewise the 

 bounding angle of an anterior lateral face or plane {al.). Of these 

 there are two. The inner edge is the side of the rectangle (a.); the 

 upper edge, the margin of one side of the upper hexagon. The outer 

 edge is the lateral rim of the anterior face, which is convex, and like- 

 wise a lower side which forms a margin of the opening into the bell 

 caA^ity. 



