1!)(! F. A. BATHER, CBINOIDEA OF GOTLAND. 



Gissocrinus typus (continued). 



Fig. 272. Original of ANGELIN, Tab. XXIX, fig. 76. Brachials from the dorsal side, with the backs 

 rnbbed away, exposing the calcite intilling of the ventral groove, which here hears a re- 

 markable resemblance to an internal series of alternating plates * . 



Fig. 273. Same specimen; brachials from the dorsal side. The upper part of the drawing is as in Fig. 

 272. except that the wall of the brachial bas been dissected away on the right, exposing more 

 clearly the infilling calcite. Below, the body of the brachial and the infilling calcite are cn- 

 tirely removed, so as to present an interiör view of the roof of covering-plates. Xote the 

 very large size of c 3 , as compared with its small size in the exteriör view, the absence of 

 c 2 from the inner surface and the presence of the small inner pieces i. The proximal ends 

 of the covering-plates are only slightly ridged for articular purposes and the notch for the 

 axial cord cannot be clearly distinguished in this drawing. (p. 157.) 



Fig. 274. Same specimen; brachials from the dorsal side, the body of the brachial being removed in the 

 lower part of the drawing and the intilling calcite and proximal ends of the covering-plates 

 t lins exposed. This shows the notches for the branches of the axial cord that go to the 

 covering-plates a llttle more clearly than Fig. 273; the most clear seems to be at the poinl 

 opposite the letter <•'. 



Fig. 275. Same specimen; transection of a brachial, with covering-plates. The three elements of the left- 

 haud covering-plate are lettered c 1 , c-, c 3 ; below c' 1 is seen the inner piece i. The calcite 

 infilling * appears split into four or tive portions, which give the effect of as many pl: 

 and as such they are alluded to on p. 157. In this species, indeed, the appearance i 

 deceptive that it bas only been the evidence of a number of specimens of other species that 

 has led me to the right conclusion. It seems possible that this division of the intilling calcite 

 may have been dne to the presence of the septa between the varions canals: thus, the two 

 upper divisions would represent the subtentacular canals and the lower ones the coeliac canal; 

 the genital rachis would have lain in the centre where the dark lines cross. The section of 

 the arm of Actinometra nigra, given by P. H. Carpbnter, Challenger Report Stalked Crinoids, 

 Pl. LXI, tig. (1. may readily be compared with the present drawing. I have seen similar 

 struetures in a transection of the arm of Gupressocrinus. (p. 157.) 



Fig. 270. Original of ANGELIN, Tab. III, fig. 3; posterior view of lower part of crown. The IBB are 

 missing. (pp. 154, 15G and 157.) 



Fig. 277. Portion of ventral sac; from original of ANGELIN, Tab. XXIX, tig. 76. (p. 157). 



Fig. 278. Section of ventral sac, for comparison of with Angelin, Tab. XXVII. tig. 1 b, but not from 

 the same specimen. (p. 157, where it is wrongly refered to as Fig. 308.) 



Fig. 279. Original of Angelin, Tab. XXIX, tig. 75 d\ ventral surface of calyx. M = Madreporite; 

 amb = ambulacrals; i\ = Deltoids. (pp. 157 and 158.) 



Type of G. nudus and G. tubulatus, from r. post. radius. (pp. 154, L56 and 157.) 

 Same specimen, from ant. radius, showing arm-cliaiacters as described. 

 Same specimen; a radial, showing traces of ornament. 



Columnals of a specimen of G. typus that approach those of G. campamda (Fig. 303), hut 

 are still distinct. (p. 158.) 



G. elegans (p. 159). 



Fig. 284. Specimen a; in position on matrix, i.e. from ant. radius. Compare Angelin, Tab. III, fig < 



Fig. 285. Same specimen; from below, showing post. B. 



Fig. 280. Same specimen; brachials from the back, with patelloid plates. 



Fig. 287. Same specimen; brachials from the side. showing covering-plates and one small patelloid 



plate. (p. 159.) 

 Fig. 288. Same specimen; brachials from ventral surface, showing covering-plates. Compare Fig. 271. 



(p. 160.) 

 Fig. 289. Same specimen; articular facet of brachial, showing covering-plates, calcite intilling, ventral 



groove, axial canal and slightly detined articular ridge partly enelosing the canal. (p. 159). 

 Fig. 290. Specimen b; posterior view. (p. 160.) 

 Fig. 291. Same specimen; ri^ht anterior radius, showing part of an arm and ornamented cup-plate* 



A little spöt on the anterior basal is probably dne to a boring parasite. (p. 159.) 

 Fig. 292. Same specimen; portion of ventral sac, very much weathered, with delusive appearance of 



pores, produced by erosion of the ridges. That no pores or slits are really present in this 



genus may be seen from Figs. 277 and 278. (p. 160.) 



Fig. 



280. 



Fig. 



281. 



Fig. 



.282. 



Fig. 



283. 



