BRYOZOA OF THE CAPE VERDE ISLANDS. 



(TL); St. Paul's Rock, N. Atlantic (ChalQ; St. Vincent, Cape Verde Islands, 

 1070-1150 fath. (Chall), Cape Verde Islands, 110-180 met. (Calv.) ; Boa 

 Vista, Cape Verde Islands, collected by Crossland. 



SCRUPOCELLARIA TRIDENTATA, Sp. 110V. (Plate 1. figs. 9, 10.) 



Zoarium spreading in all directions, forming a circular growth, in most 

 respects agreeing with S. cervicornis, Busk, but below each bifurcation 

 there is a very large raised avicularium, of which the mandible has three 

 long narrow prongs, and the avicularian chamber folds inwards round three 

 projections to receive these prongs as in a half-open tube (PI 1. fig. 10). 

 In other parts there is an anterior avicularium on each zocecium, just below 

 the area *. Hindis describes avicularia below the area on a tall columnar 

 process, in 8. cervicornis, Busk. 



Fig. 1. 



Scrupoce/laria tridentata, sp. nov. X 50. 



t 



There are about six oral spines, none of which are bifurcate ; down the 

 middle of the zoarium there are very long stout erect spines, and these in one 

 internode will all belong to the zooecia on the right side, whereas in the 

 companion internode of the same age they will belong to the zooecia on the 

 left side, in both cases growing from near the distal end. Hindis refers to 

 tall spines on each side of the branch in <S'. cervicornis, and when a colony of 

 S. tridentata is seen from the side the spine appears to grow from the side. 



The lateral avicularia are very minute, being smaller than those figured 

 by Stuitt f in his S. cervicornis. Smitt calls attention to the variation in the 

 size of the lateral avicularia in S. cervicornis, and also makes comparisons of 

 S. pusilla, Smitt, S. cornigera, Smitt, and S. cervicornis, Busk. MacGillivrav 

 figures the Australian form with large avicularian mandibles. This species, 

 S. cervicornis, Busk, S. cornigera, Smitt, and S. obtecta, Hasw., have very 



* Hincks, Ann. Mag. Nat. Hist. ser. 5, vol. xi. (1883) p. 103. 

 t " Floridau Bryozoa," Pt. I. p. 15 (187:2). 



