566 MR. T. GOODEY ON THE SKELETAL [Mai'. 15, 



I have found a few rather important differences between the 

 specimens which I have examined and those previously described 

 and figured; these points will be dealtrwith in due course. 



The pelvic girdle resembles that of the female, being a flattened, 

 elongated plate of cartilage. It has a convex anterior edge 

 (another example had this edge slightly concave) and a concave 

 posterior edge- There are a number of nerve-foramina perforating 

 it at a short distance from each lateral border, the number of 

 which has already been given. 



The basipterygium, B, is attached postero- laterally to the girdle, 

 and there is a small piece of cartilage inserted dorsally in the 

 attaching ligament, having the appearance of a portion segmented 

 from the basipterygium, The latter is a fairly stout cartilage, is 

 laterally compressed so that it is about twice as deep as wide, and 

 is concave on its inner, and convex on its outer surface. It also 

 has a rather prominent rounded ridge on its dorsal side. 

 Attached to the dorso-posterior end of the basipterygium is the 

 simple rod-shaped radial fl. This was not mentioned by Giinther, 

 but Jungersen surmised that it was present and suggested that it 

 had been overlooked. Braus has figured it. It is of interest to 

 find that it is present, as it brings Chlamydoselachus into line 

 with most of the described forms of Elasmobranch mixipterygia 

 in this respect. 



The axial cartilage, b, is attached to the distal end of the basi- 

 pterygium somewhat ventro-laterally and toward the inner side. 

 Lying in the thick connecting ligament is a single insignificant 

 intercalary cartilage, b. 1, which Braus also has figured. The 

 proximal end of the axial cartilage is comparatively thin and 

 laterally compressed. In this respect, and particularly in respect 

 to the single intercalary cartilage, there is here an important point 

 of difference from Giinther's figure. As shown in the latter, the 

 axial cartilage is proximally broad and spindle-shaped, also one 

 large arid two small intercalary cartilages are shown closely 

 attached to it, the large one having the appearance of a portion 

 segmented from the axial cartilage. In view of the fact that I 

 have found three axial cartilages narrow and somewhat com- 

 pressed, with a single insignificant intercalary cartilage in each 

 case, I can only suggest that the large intercalary cartilage 

 figured by Giinther is really a fractured portion of the anterior 

 end of the axial cartilage, for it certainly has this appearance. 

 With regard to the two smaller ones, it seems to me that the 

 anterior one in his figure is really the base of the missing radial 

 /3, whilst the intermediate one corresponds to the single intercalary 

 cartilage. 



It is of interest to note also that the mixipterygium figured by 

 Giinther is that of the right side, as is the one which is given in 

 this paper ; but, curiously enough, the lateral radials in his figure 

 are placed to the left of the basipterygium, whereas they are 

 actually on the right side, as I have figured them. 



Proceeding towards its distal end, we find that the axial 



