BRYOZOA OF THE CAPE VERDE ISLANDS. 19 



hoc. San Pedro, California (Robertson). St. Vincent Harbour, Cape Verde 

 Islands, 10 fath., collected by Orossland. 



SCHIZOPORELLA TRICHOTOMA, Sp. 110V. (Plate 2. figS. 1-4.) 



The zoarium is adnate, incrusting clinkers. 



The zooecia are ovate, with pores spread over the surface, which under a 

 low power appear stellate ; the oral aperture is large, with a distinct sinus on 

 the straight lower edge, and straight sides; at the distal end of the zocecinm 

 there are four spines. The operculum has a diagonal ridge at each side. 



The decalcified frontal zocecial wall shows that the upper membrane has, 

 at the position of each pore, three oval disks, then below this in the lower 

 membrane there is a circular disk with a spot in the centre (fig. 3). 



The raised ovicell has a median ridge and a mucro, with ridges from the 

 mucro to the distal end of the aperture. There are pores round the edge of 

 the ovicell. 



The primary has eleven spines. 



Only dried specimens have been met with. 



Scltizop)orella divisopora, Waters *, and S. pulclvra, Neviani f, both have 

 stellate pores, but the ovicells do not quite correspond, though the main 

 characters are the same in S. divisopora, so that the recent species are closely 

 related. 



hoc. St. Vincent Harbour, Cape Verde Islands, 10 fath., collected by 

 Crosslaud. 



Osthdiosia avicdlaris (Hinds), Waters. 



For synonyms see Miss Jelly's Catalogue under Cellepora avicularia, Hiucks, and 

 Calvet's Expe'd. Sc. du ' Travailleur ' et du 'Talisman,' Bryozoaires, vol. viii. (1907) 

 p. 441. 



Cellepora americtma, Osburn, " Bry. of Woods Hole," Bull, of the Bureau of Fisheries, 

 vol. xxx. (1910) p. 238, pi. 25. figs. 52 a, b; pi. 31. fig. 99. 



There is only one specimen, which is about 5 mm. high, the zoarium is 

 massive with three or four short lobes. The rostrum to the oral aperture is 

 usually short, but there is generally in this species much variation in this 

 respect. In specimens from Naples sometimes there is quite a long rostrum 

 with avicularia on the inner side, while others in the same specimens have 

 much shorter ones with the mandible near the end. It therefore seems that 

 the Mediterranean form includes the differences mentioned by Osburn, who 

 says his C. americana is related to avicularis. The large vicarious avicularia, 

 with nearly parallel sides, are abundant in some parts of the specimen. 



hoc. Arctic: British; Mediterranean at Naples, Rapallo, Cette, Corsica, 



* "Bry. from N. S. Wales, &c," Ann. Mag. Nat. Hist. ser. 5, vol. xx. (1887) p. 193, 

 pi. 5. fig. 4. 

 t "Bri. foss. della Farnesiana," Pal. Ital. vol. i. p. 110, pi. 5. figs. 36, 37 (1895). 



