124 MARINE BIOLOGY OF THE SUDANESE RED SEA. 
areas. This is perhaps somewhat intensified in my case, through my last 
work having dealt with Arctic and Antarctic Bryozoa, where the faunas are 
so much more distinct. The analysis of the distribution is postponed for the 
paper on the Cyclostomata, &e. 
Specimens from near the Suez Canal, where we find so many Mediter- 
ranean species, cannot be considered as reliable as those from farther down 
the Red Sea, for passing ships may have brought some from distant parts, 
and ultimately a list of species exclusive of those from Suez would be 
interesting. This question of artificial transport is not confined to the Red 
Sea, but nowhere should we be more alive to it. However, regarding this, 
Mr. Crossland: writes “ ve Suez forms, my examination of ships’ bottoms there 
suggests that very few forms survive the Canal. There was a very marked 
difference between Red Sea steamers and those brought through from Alex- 
andria, the former being very rich.” 
Points of Special Interest. 
Attention must be called, in the first place, to the very wide distribution of 
so many species of tropical Bryozoa (see page 126); in the next, to the 
great variety of form and development of the oral glands, as well as their 
similarity in certain groups, consequently their importance in classification is 
explained (p. 154). It is shown that there is a group, now separated from 
Cellepora as Holoporella, the zocecia of which have a widely open ovicell, an 
operculum with a nearly straight and entire proximal edge, many of the 
avicularian mandibles have a collumella; also at the side of the zocecium there 
are, in most species, minute avicularia which have been overlooked ; and the 
zocecia have large tubular oral glands (p. 159). 
Reference is again made to Thalamoporella having two or three larve in 
the ovicell; also the pigment of species of Holoporella is mentioned and the 
growth of the new buds from the operculum (pp. 163, 164). I allude to the 
number of characters which influence the structure of the operculum, and it | 
is now easier to understand why it is of so much use in classification (p. 161). 
I cannot close this introduction without expressing my thanks to 
Mr. Kirkpatrick for the kind way in which he has allowed me to make 
frequent references to the British Museum collections, and also to Miss 
Thornely for assistance in examining the Manaar collections. 
The literature specially dealing with the tropical forms is not large and the 
following are the principal works :— 
Savieny, J. C.—Description de ’Hgypte. Hist. nat, i. pls. 6-14. 
Auvpouin, J. V.—Explication sommaire des Planches de Polypes de 
Egypte et de la Syrie, pub. par J. C. Savigny. 1826.* 
* C. D. Sherborn, “On the Dates of the Natural History Portion of Sav. Descr. de 
lEgypte,” Proc. Zool. Soc. 1897, p. 285. 
