1874.] MR. R. B. SHARPE ON BIRDS FROM BUUMA. 305 



Fig. 12. A fully developed sphero-stellate retentive spiculuni with cylindro-sub- 

 foliate radii, magnified 530 linear. 

 13. A fully developed attenuato-stellate retentive spiculum, magnified 

 530 linear. 



Geodia reticulata, Bowerbank. 



Fig. 14 represents the type specimen parasitical on the remains of the stem of a 

 fucus, natural size. 



15. One of the fusiformi-acerate skeleton-spicula, magnified 80 linear. 



16. A well-developed attenuato-patento-temate connecting spiculum, mag- 



nified 80 linear. 



17. A portion of one of the long and rather slender recurvo-ternate con- 



necting-spicula, magnified 80 linear. 



18. A portion of one of the porrecto-ternate connecting spicula, magnified 



89 linear. 



19. One of the attenuato-stellate retentive spicula, magnified 530 linear. 



20. An average-sized cylindro-stellate retentive spiculum, magnified 



530 linear. 



Plate XLVII. 

 Halispongia ventriculoides, Bowerbank. 

 Fig. 1. A small but very perfect specimen of the species, with the remarkable 

 orifice at the base of the sponge, natural size. 

 2. A well-formed cup-shaped specimen of the species, with a fan-shaped 

 offset attached to its base, natural size. 



Halispongia Mantelli, Bowerbank. 

 Fig. 3 represents the type specimen of the species, natural size. 



4. A section of H. Mantelli at right angles to its external and internal 

 surfaces, exhibiting the reticular structure of the skeleton with the 

 embedded particles of sand at both surfaces : a, the external surface ; 

 b, the internal one : magnified (30 linear. 



8. On a small Collection of Birds from Bulama, one of the 

 Bissagos Islands, W. Africa. By R. Bowdler Sharpe, 

 F.L.S., F.Z.S., &c, Senior Assistant, Zoological Depart- 

 ment, British Museum. 



[Eeceived April 17, 1874.] 



I am indebted to Major Bulger for the opportunity of examining 

 a small collection made by his brother Lieut. Bulger in Bulama 

 Island ; and as no one has before collected in the locality, I give a 

 short list of the species. ' Major Bulger has sent me the following 

 note on the locality whence these birds come, which I cannot do 

 better than reproduce : — 



"The Bissagos or Bijuga Islands lie on the west coast of Africa, 

 between 11° 40' and 10° 50' N. lat., and 15° 30' and 16° 30' w[ 

 long., opposite the mouth of the river Bulola or Rio Grande. They 

 form a group of about twenty islands, enclosed by a reef. Most of 

 them are inhabited ; but some are nearly bare rock, and only visited 

 occasionally. The largest, Marshi, is above 15 miles long. The 

 islands Carache, Corbele, Cazegut, Gallinas, Orango, Canyabac and 

 Bulama are much smaller. On Bulama the English formed a settle- 

 ment in 1/92 ; but it was abandoned in 1/93 on account of its un- 



