Fig. 



316. 



Fig. 



:'.17. 



Fig. 



318. 



Fig. 



319. 



Fig. 



320. 



Fig. 



321. 



Fig. 



322. 



Fig. 



323. 



Fig. 



324. 



L98 K. A. BATHER, CRINOIDEA OF GOTLAND; 



Gissocrinus (continued). 



G. macrodactylus (p. 165). 



Type-specimen, in natural position on matrix, with stem. (p. 165.) 



Same specimen; cup removed from stem and seen from below. The small ur unfused IB is 



in 1. post. radius. (p. I6ö.) 



The dorsal cup; posterior view. (p. 165.) 



Portion of arms, from distal region, (p. 165.) 



Ill Br from ventral surface and in sec.tion. (p. n'>5.) 



II Br and (a) articular surface of II ax. (p. 165.) 



The anal tube, as mucb as is exposed, showing the ridges, the summits of which are slightly 



worn and the sutures between the plates, which, it is seen, are unaecompanied by slits or 



pores. (p. 165.) 



Columnals. (p. 166.) 



Articular facet of a columnal. showing quinquelobate axial canal. (p. 166.) 



G. macrodactylus? (p. i •'>.">). 



Fig. 325. Specimen said to be the type of Myelochtctylus gracilis, ANG. (p. 165.) 



G. cfr. goniodactylus (p. L67). 



Fig. 326. Brachials from the back. The median furrow is due to weathering and may also be traced 



in Fig. 334; it is possibly connected with the axial canal. 

 Fig. 327. Part of an arm, about half-way up, seen from the ventral surface. Towards the distal end 



the ventral groove tends more and more to coalesce with the axial canal. 

 Fig. .'528. Brachials from the proximal region of an arm, seen from the ventral surface, with covering- 



plates partly removed, showing the ventral groove with its ledge on either side for their 



reception. 

 Fig 329. Articular facet of brachial, showing trace of union between ventral groove and axial canal. 

 Fig. 330. Articular facet of a brachial, with axial canal quite separate and eovering-plates in position. 

 Fig. .'531. Articular surface of a brachial of rather irregular shape, due to the apposition of the - 



sponding brachial of the other branch of the dichotom. 

 Fig. 332. A similar brachial, with the axial canal connected with the ventral groove. 

 Fig. 333. A brachial from the distal region of an arm. scen from the articular and ventral surface-, 



with covering-plates in position. 

 Fig. 334. The remains of the ventral sac, slightly weathered, especially on the transverse ridges and 



with some of the plates shifted from their natural positions. This combination produces, ;>< 



is so often the case, a remarkable appearauce of ])orcs ur slits. Tbe true strueture is bow- 



ever, easily seen in the dfawings of separate plates u, l> and c. (p. 167). 



G. incurvatus (p. 168). 



Fig. 335. Original of Angelin, Tab. XXVI, tig. 1. after having been carefully cleaned by Mr. G. LlLJB- 



VALL. Seen from below, both BB and IBB wanting. (p. 169.) 

 Fig. 336. Same specimen, posterior view, showing anal tube, which here lies alongside of the arms in- 



stead of drooping below them as in Fig. 342. (p. 169.) 





