87 
parts is quite smooth, gets at about the 40th joint irregular pits 
on the sides of the columnals. From the 57th segment and to the 
Figs. 7—17. Porphyrocvinus verrucosus. 7) Distal end of Ihe most distal 
stem-joint, X SVs; 8 ) 3rd to 8th Brr, ventral view, x 6 V 2 ; 9) Proximal 
articular face of Br 3, 23 / 1 ; 10) Distal syzygial face of Br 3, 23 / 1 ; n) Distal 
face of Br 8 , a pinnule-facet to the right, 23 / 1 ; 12 ) Distal face of Br 7, 
3 / 1 ; 13a) 5 proximal segments of a pinnnle from Br 14, b) 9th segment 
of the same pinnnle, 23 / 1 ; 14 ) )st pinnular from a pinnnle on Br 12, 
distal articular facet, 15) 2nd pinnnlar of the same pinnnle, distal 
facet, ; 16) 6th segment of the same pinnnle, distal facet 17) A 
transverse section through the non-muscular articulation between Br 
9 and 10. The blotchy tissue signifies the decalcified Br; 1. 1. = lateral 
ligament, d. 1. = dorsal ligament, c = coelom, n = dorsal nerve 
(shrunk), i = a remnant of the intestinal wall, ‘‘O/j. 
end of the stem the stalk is covered by the curious calcareous granula¬ 
tion mentioned above. There are no traces of any radicular (rhizoid) 
