CHAP. IL. ] FROM PORTSMOUTH TO TENERIFFE. 145 
of its cup, certainly presents a curious resemblance to the Cam- 
brian Dictyonema. This resemblance must, however, be only 
superficial, for Dictyonema passes, with many points of accord- 
ance equally remarkable, into the graptolites, which we can 
scarcely doubt must be referred to a very different group. 
Fig. 31.—Salenia varispina, A. AG. Four times the natural size. (No. 6.) 
