162 F. A. BATHEK, CRINOIDEA OF GOTLAND. 



are sometimes subsidiary ridges; hut this ornament is as a rule less pronounced than in 

 G. typus (tig. 298). The ridges are more marked on the sides than on the back. The 

 ossicles differ markedly from those of G. typus in their extreme lateral compression; thus 

 a ii VIIIBr with a height and breadth of 0.5 mm. has a depth of 1.75 mm. The arms are 

 finer in general appearance and more branched than in G. typus. The axial eanal is 

 distinct. The ventral groove is the fri II width of the ventral surface. 



The covering-plates are composed of three elements, as in G. typus; but. owing to 

 the less length of the brachials, onlv 2 1 / s or 3 covering-plates go to each (figs. "299—301). 



IBr I ; about 2 mm. high; the width varies considerablv. The upper and lower 

 sides are curved; sometimes it is pentahedral, sometimes trihedral. 



IIBr 1; wide, and only slightly higher than IBr. They may rest on the curved 

 upper sides of IBr,, or partly on this and partly on the radials. In the latter case IBr, 

 is smaller in proportion, and the IIBr of two adjacent arms may almost meet one another. 

 The two IIBr of the same arm are very closely apposed, and appear to have been suturally 

 united in almost everv case. Very rarelv indeed there ma v be two IIBr in an arm-branch. 



IIIBr 1, 2, 3, or 4; the numbers are nearly always symmetrical and the higher 

 ones are towards the inside of the arm, e. g. 1—2 = 2 — 1, or 2 — 3 = 3 — 2. They are 

 rather wider than high. 



IVBr range between 3 and 6; the higher numbers are on the inside of each dicho- 

 tom, but the symmetry is not quite so marked, e. g. 2 — 3 — 5 — 2, 3 — "> = 6 — 3, or 

 3 — 6 = 6 — 4. Here the sign = stånds for the middle line of the dichotom. 



VBr as seen from the back are slightly longer than broad, and this proportion ob- 

 tains to the end of the arms. 



The arms continue up to LXBr or further, and the inner branches are far longer 

 than the outer ones. 



Anal structures are essentially the same as in G. typus. but the transverse ridges 

 of the tube are rather more pronounced and set in more proximally (tig. 302). 



The Stem differs from that of G. typus in that a greater number of verv fme 

 ossicles occur between the larger ossicles. The ossicles are round and have a small pen- 

 tagonal canal. Their diameter is (5 mm. and the height of the larger ones is 4 min. 

 (figs. 303, 304). 



I also refer to this species with some doubt some arms from the quarry between 

 Bara and Wallstena, which are very large and show the peculiarities of the species verv 

 clearly, but have no ridges (figs. 305, 306). 



Notes on Angelin's figures: 



Tab. XXVII, fig. 1, division ((. The arms present a marked resemblance in their 

 disposition and general appearance to the terminal branches of a specimen of this species 

 which resembles the tigure in no other respect. 



Tab. XXVII, fig. 1, division y. This division of the figure resembles the correspond- 

 ing part of a specimen of this species otherwise unlike the tigure (see fig. 293). 



