KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 25. N*.0 2. 161 



branch 8 or 9 times. Arm-ossicles with distal expansion, and much corapressed läterally. 

 Covering-plates about 2 1 s to the ossicle. Ventral Sac vertical; distally composed of para 1- 

 lel series of almost quadrangular plates, with strong transverse folds. Stem-össicles cir- 

 cular; larger ones occurring between several verv löw ones. 



The necessitv for founding this new species has been discussed under G. typus: 

 the trivial name has reference to the shape of the closed eroAvn. As types of this species 

 I take 6 fairly perfect crowns, two with stem-fragments; and 1 refer to it with differing 

 degrees of certainty 7 portions of crowns. The six types include the originals of the 

 figures, or parts of figures, mentioned above under the name G. punctuosus. AU other 

 speeimens, however, figured as G. punctuosus by Angelin, including the original of Tab. 

 XXVII. tig. 1, division d\ and all other figures of Angelin bearing the name punctuosus, 

 are to be referred to G. typus. 



Description. 



The folded crown, as attached to its stem, resembles an elongated bell, or still more 

 the tlower Campanula (hg. 293). 



The Dorsal Cup is a wide open cone. It is ornamented as in G. typus, but, owing 

 to the peculiar habitus of the species, the stem and even the lower part of the cup are 

 often broken away, and the plates of the cup have become so worn that the ornament is 

 very indistinct. 



IBB normally 3. Thev are visible, though not very clearly, in the originals of 

 Tab. XXIX, fig. 74 a, and Tab. XXVII, tig. 1, division «, and in one other specimen. In 

 the first and last of these speeimens thev have been broken across, and the lower part together 

 with the stem is absent. In the first specimen (fig. 294) the two pairs of IBB are not vet 

 completely fused, so that 5 sutures can be made out; it is, however, clear that r. post. 

 IB is fusing with r. ant. IB, and ant. IB with 1. ant. IB, since 1. post. IB is larger than 

 the others and the sutures separating it are clear. In the second specimen also the single 

 IB is seen in the 1. post. radius (fig. 295). In the third specimen (fig. 296), however, 

 the single IB appears to lie, as in some speeimens of G. typus, in the r. ant. radius; on either 

 side of this and in the 1. post. interradius alone can sutures be distinguished. The IBB were 

 very low, and in two speeimens seen from the side, Tal». XXIX, fig. 74 and Tab. XXVII, 

 fig. 1, division ;', they can hardly be perceived (fig. 293). 



BB 5; four are hexagonal, the post. B heptagonal; but, owing to the fusion of IBB, 

 the two lower sides are often in the same straight line, so that the BB are practicallv 

 pentagonal. Height 2.75 mm., width below 2.75 mm., width above 3.4 mm. 



RR 5; lunate. Height to bottom of facet 2 mm. or less; width below 4 mm.; 

 width above 5.5 mm.; length of side 3.6 mm.; width of facet from about 3.5 mm. to 

 4.5 mm. 



The Arms spread out at right angles from the cup; thev then curve upwards 

 slightly, and in the region of VIBr bend straight up, and then slightlv inwards. The 

 least diameter of the closed arms is at about the level of VIIIBr; distally they again 

 spread outward. Each ossicle expands into a distal ridge, much as in G. typus, arid theiv 



K. Sv. Vet. Akad. Handl. Band. 25. N:o 2. 21 



