140 PERCY SLADEN TRUST EXPEDITION 



There are some colonies of a Scrupocellaria, having the large figured scutum, the small 

 lateral and anterior avicularia and the perforated oobcia of Hincks'* and MacGillivray'sf 

 specimens of S. obtecta. They have here, sometimes four, but usually two spines, 

 the lower pair usually stout and forked. Hincks speaks of two, simple spines, and 

 MacGillivray of only one. There are none of the occasional large, lateral avicularia of 

 Hincks' specimens, the median avicularium varies a little in size and has often a serrated 

 beak, the vibraculum is like Hincks' and is longer than in MacGillivray 's specimens: The 

 forked spines, figured scutum and perforated ooecium the present specimens have in common 

 with S. cervicornis, but they are larger, more robust and less glassy than that species. 



Amirante, 29 fath. ; Cargados, 30 fath. ; Providence, 50 — 78 fath. 



10. Scrupocellaria frondis, Kirkpatrick, Journ. Linn. Soc. ZooL, xx, 1890, p. 504. 

 The spines, median avicularia and ooecia correspond with those of this species, the 



characteristic antler-like spine being a marked feature. There ai'e, however, lateral 

 avicularia present here and the scutum is difierent, being spade-shaped, sometimes much 

 elongated, so as to make a curved band right over the front of the aperture, extending 

 even beyond it, and covered by a tree-like tracery. Median avicularia are small and have 

 pointed mandibles directed downwards and outwards. There is a toothed radical fibre. 

 The one small specimen is of a delicate vitreous nature, with some resemblance to 

 S. cervicornis. 



Amirante, 29 fath. 



11. Scrupocellaria macandrei, Busk, Brit. Mus. Cat., i, p. 24. 

 These specimens have the broad granular margin to the aperture, the large lateral 



avicularia and the raised median avicularia and the 4 — 5 spines of Busk's]}; species. The 

 eminence carrying the median avicularium is tall and leans from the base of one zooecium 

 to about the base of the peduncle of the scutum of the opposite zooecium. The ocecium is 

 smooth, with an oval, flattened area on the front wall in some cases. The vibracular cell 

 is wedge-shaped, reaching right across the back of the zooecium, the vibraculum is smooth, 

 about twice the length of the groove it rests in ; there are two vibracula in each fork of 

 a branch. Colonies are slender, of a yellowish colour. 



Providence, 50 — 78 fath.; Amirante, 29 fath.; Farquhar, reef; Cargados, 30 fath.; 

 Seychelles, 34 fath. 



12. Caberea boryi (Aud.). 



Crisia boryi, Aud., Descrip. de I'Egypte, Nat. Hist., i, p. 72 ; Busk, Brit. Mus. 

 Cat., i, p. 38. 



The one small colony of this form has the scutum more developed below its peduncle 

 than above, the upper portion often extending across and uniting with the side of the 

 zooecium as in Busk's variety zelanica, pi. 16, figs. 4 — 5. There is not the stout spine 

 near the peduncle of the scutum, as is usual in this variety, the lower zooecia on a branch 

 having none and the upper four slender spines only, if any. Avicularia as in C. rostrata, 



* Ann. Mag. Nat. Hist., ser. 5, xi, p. 193. t MacG., Prod. Zool. Vict. Dec. xiii, p. 102. 



J Rep. Cballenger Exp., x, pt. xxx, p. 23. 



