134 F. A. BATHEE, CRINOIDEA OF GOTLAND. 



a few ann and stem fragments and 76 cups from the Klinteberg, of which latter two that 

 are here figured may be distinguished as e and /. 



Description. 



Dorsal Cup a broad cone, rounded at the base and often projecting radially (figs. 

 215, 217). The shape, thongli characteristic, is very variable in minor points. Tims the 

 infrabasals may project at a rather sharp angle with the stem-axis, as in a, or mav gently 

 eurve upwards, as in b. The plates, especially the basals, may be very t.umid; but in a 

 few cases, as in b, the swelling is inconspicuous. The projéetion of the radials also varies 

 very much. In Anokuns diagnosis the posterior rays are said to be much shorter tlian 

 the anterior; this character, however, which also is extremely variable and not noticeable 

 in 6, is by no means confined to this species; it is in fact equally the case in C. visby- 

 censis and is even seen in one specimen of C. longimanus (Tab. XX, lig. 4). 



I BB ö, pentagonal and almost equal-sided. Measurements in a are as follows: 

 height 7 mm.; width below 4.75 mm.; width above 7 mm. 



BB 5, hexagonal; post. B. heptagonal. In a the height is 11.25 mm.; width below 

 8.5 mm.; width above 11 mm. 



RR 5, pentagonal, with parallel sides. They vary considerably in height in differ- 

 ent individuals. The posterior RR are as a rule a little distorted, and generally smaller 

 than the others; this, however, is by no means invariable. The measurements in a are: 

 total height 10 mm.; height to bottom of facet 7 mm.; width below 11.5 mm.; width 

 above 11 mm.; width of facet 6 mm. The facet (fig. 207) is generally abont half the 

 width of the radial, but is not always in the centre; it is elliptical in outline; a fulcral 

 ridge rims across a little outside the long diameter, and in the centre of this ridge is 

 the axial canal. The food-groove forms a wide depression on the inner side of the ellipse. 

 The angle at which the facet is directed outwards varies much in different individuals 

 and even in the same specimen, making any angle with the horizontal between 35° 

 and 85°. 



The Arms dichotomise regularly and lessen in thickness quite gradually, remaining 

 rather stout even to their extremities. The ossicles are rounded and slightlv swollen, and 

 often might be described as moniliform; sometimes, however, they are more even in 

 thickness. In section they are roughly circular. An axial canal is very distinct, at all 

 events in the proximal region, and coincides with the centre of the circle. The ventral 

 groove is a broad, curved, shallow depression (figs. 209, 213). 



The covering-plates are two or two and a half to eaeh arm ossicle. In their simplest 

 form, which apparently occurs in all the British specimens, the covering-plates are conical, 

 both in outline and longitudinal section, regularly alternating, and extending abont three- 

 quarters across the ventral surface (see Text-fig. 18(4) and »Brit. Foss. Crin. \ III», Pl. 

 XIII, figs. 10 a, c). A more elaborate form, however, occurs rarely in British specimens 

 but coramonly among the larger individuals from Gotland (see tigs. 208 — 213). Here each 

 covering-plate, as seen from the exteriör (fig. 208), appears divided by a suture which 

 cuts off the apex of the cone just a little to the apical side of the median line of the 

 arm; each covering-plate thus consists of a large proximal portion, c', and a small distal 



