BRY0Z0A OF THE CAPE VERDE ISLANDS. V 



Membranipora tenuirostris, Hincks. 



Membraniporu tenuirostris, Hincks, Anu. Mag. Nat. Hist. ser. 5, vol. vi. (1880) p. 70, 

 pi- 9, tig. 3 ; op. cit. ser 5, vol. x. (1882) p. 7; op. cit. ser. 5, vol. xix. (1887) p. 314; 

 Waters, J ourn. R. Micr. Soc. ser. 2, vol. v. (1885) p. 775, pi. 14. tig. 41 ; Quart. Journ. 

 Geol. Soc. vol. xlvii. (1891) p. 11; Journ. Linn. Soc, Zool. vol. xxi. (1898) pp. 668 & 685, 

 pi. 47. fig. 7. 



Membranipora Flemingii, Waters, Ann. Mag. Nat. Hist. ser. 5, vol. iii. (1879) p. 122, 

 pi. 13, fig. 2. 



In the specimens from the Cape Verde Islands some parts have the spines 

 as figured by Hincks, whereas in others there are none. In my paper on 

 Membraniporidse I referred to the spines not occurring in Naples and 

 Rapallo specimens. 



Loc. Queen Charlotte Islands (Hincks); Madeira on Pinna (Hincks) ; Naples, 

 low water to 40 t'ath. ; Capri ; Rapallo; Adriaiic; Oran (Algiers), 54 t'ath. ; 

 St. Vincent Harbour, (Jape Verde Islands, 10 t'ath., collected by Crossland. 



Fvssil. Bartonian and Pliocene of Italy. 



Membranipora curvirostris, Hincks. 



Membranipora curvirostris, Hincks, Ann. Mag. Nat. Hist. ser. 3, vol. ix. (1801) p. 295 

 (39), pi. 7. fig. 4 ; Brit. Mar. Polyzoa, p. 153, pi. 20. figs. 5, (1880) ; Ridley, Proc. Zool. 

 Soc. 1881. p. 46; Waters, Journ. Linn. Soc, Zool. vol. xxvi. (1898) pp. 668 & 684, pi. 47. 

 figs. 2, 12. 



Some of the zooecia have a median spine below the area, also one or two 

 spines in various other positions. There is the unoccupied space above the 

 avicularium as in the British and Naples specimens. 



Loc. British, Polperro, 40 fath ; Singapore ? ; Brazil, 35 fath. (Ridley) ; 

 Naples ; St. Vincent Harbour, Cape Verde Islands, 10 fath., on clinker and 

 from a diver, collected by Crossland. [JJvvarka, Arabian Sea (Tliornely).~\ 



Membranipoka ol'adrtooiinuta, sp. nov. (Plate 1. fig. H.) 



There are incrusting specimens from St. Vincent Harbour, Cape Verde 

 Islands, 10 fathoms. The opesia is oval, and at the distal end on each side 

 there is a short cervicorn spine, and lower down there is another pair. There 

 are a considerable number of vicarious avicularia just like those ol M. crassi- 

 marginata, Hincks | — in fact, the species is like M. crassimarginata, except 

 that there are two pairs of cervicorn spines. The avicularia are about as 

 long as the ordinary zooecia, but not quite so wide. The border is crenulated. 



There is one distal rosette-plate about the middle of the distal wall, and 

 two lateral rosette-plates about halfway between the anterior anil basal wall. 



There is considerable irregularity in the spines, for the lateral ones at first 

 have only two points, whereas later there may be several divisions, and those 



[* Thornely, Hyu. & Poly. coll. -.a Okbamandal in Kattiawnr. 19J6. 

 | Ann. Mag. Xat. Hist. ser. 5, vol. vi. (,1880) p. 71, pi. '•'. lig. 1. 



