80 F. A. BATHEE, CRINOIDEA OF GOTLAND. 



rnoniliform. They have an elliptical section, cut into by a V-shaped ventral groove, which 

 is prolonged by a sliirht tongue for the axial cord. In l>, 13 ossicles of this arm are 

 preserved; their absolute size is of course greater than in a, and their proportions are 

 also slightly different: IBr, is 2.75 mm. high, 7 mm. wide below, 7.1 mm. wide in the 

 middle, and 4.75 mm. wide above: subsequent ossicles are more rnoniliform and of rounder 

 section than in a\ IBr 2 is 3.2 mm. high, and 4.5 mm. wide; IBr 3 is 2.75 mm. high, and 

 about 3.75 mm. wide. 



The 1. post. arm is obscured by matrix in both specimens, but the ant. arm is fairlv 

 well shown: both arms were donbtless of the same character. Thev branch according to 

 the general law that governs most species of the genus. This has been so fully described, 

 ■•nid with especial reference to the present species (p. 73), that repetition would be super- 

 fluous. IBi\ in a is 5 mm. wide at the base, 5.5 mm. wide above, and 1.75 mm. high 

 in the middle, but on its right side it is a little lower than on its left; its sides abut 

 on IBrj of the 1. ant. arm and on r. ant. R'; its articular snrfaces both above and 

 below are concave; there is a strong transverse groove, bounded by an imperforate fnlcral 

 ridgo, which on the upper surface is seen to be somewhat triangulär in plan, the apex 

 of the triangle projecting inward, while on either side is a well-marked depression; the 

 ventral groove is apparently a deep V notch. IBr 2 , in this case the primaxil, is roughlv 

 triangulär; the right lower angle is truncate where it abuts on II Jr, of 1. ant. arm, and 

 the left lower angle is truncate where it abnts on x: its width below is 5.5 mm., its 

 height 2.25 mm.; its right upper slope, which snpports the primaxil-arm — apparently h\ 

 slightly loose suture — is 3.25 mm. long; its left upper slope, which supports II ax — by 

 imperforate articulation like that above described — is 4 mm. long. The II, III, and IV 

 main-axils, which are all of the rest that remain, have the same general shape and strnc- 

 tnre, with gradually decreasing measurements. The union between the ossicles of the axil- 

 arms generally was probably by slightly loose suture; between axillaries and succeeding 

 ossicles, by loose suture or by imperforate articulation; between axillaries and preceding 

 ossicles, by close suture verging on a syzygy. The above description applies generally to 

 both specimens; but in l> the union between the axillaries of axil-arms and the preceding 

 ossicles does not seem to have been so close. In a the brachials are as a rule nearly as 

 wide as high; but in l> the width is as a rule only 2 / 3 the height. The sides of the 

 ossicles are parallel, except in the case of the axillaries, which widen above. The ossicles 

 are round or slightly elliptical in section, with a small IT-shaped groove, which does not 

 show any further depression for the axial canal. The left beta- and gamma-brachs are, 

 as has been already explained, larger than the right-hand branches, and these latter are 

 somewhat compressed laterally. 



Ornament: All cup-plates and brachials and the visible plates of the ventral tnbe 

 are covered distinctly by the shagreen ornament so characteristic of this family. 



Stem: In a are preserved only 2 ossicles and fragments of 3 others. In b the stcin. 

 thongh broken off at the place of articulation, is preserved to a length of 25 mm., in 

 which portion there are 42 or 43 ossicles. In the distal half of this portion, the ossicles 

 are fiiirly regnlar in height, and 8 go to 5 mm.; in the proximal half, ossicles of less 

 height alternate, though not quite regnlarly, with the others which are themselves not 



