G. W. Grahham— Wells of North -Eastern Sudan. 311 



all the scales are diamond-shaped and do not vary much in size. 

 Above the deepened scales in the anterior half of the fish there appear 

 to have been only two series of smaller scales, which are nearly square, 

 being scarcely wider than deep, but on the ventral border there are at 

 least four or five series of still smaller scales which are miich wider 

 than deep, united by a very large peg and socket and sometimes deeply 

 crimped rather than serrated at the hinder border. 



The principal lateral line clearly turns down one of the foremost 

 deepened .flank - scales, and is seen at many points throughout the 

 length of the fish traversing the uppermost row of the small ventral 

 scales. The presence of another slime canal in the normal position of 

 the lateral line is indicated by a foramen on each alternate scale in 

 the deepened flank-series. 



The new fish now described is slightly larger than the type-specimen 

 in the Munich Museum, and differs in the delicate serration of its 

 scales. The latter character, however, is so difficult to observe that it 

 may have been overlooked in the type ; and the general agreement 

 between the two specimens is so close that there cannot remain any 

 doubt as to their specific identity. 



EXPLANATION OF PLATE XIII. 



Fleuropfiolis Icevissima, Egerton : photograph of nearly complete fish, one-half nat. 

 size. Lithographic Stone (Lower Kimmeridgian) : Kelheim, Bavaria. 



IV. — Wells of the Nokth-Easteen Sudan. 

 By G. AV. Grabham, M.A., F.G.S., Geologist to the Sudan Government. 

 {Concluded from the June Number, p. 271.) 

 rPHE necessity of providing a water supply for the town and harbour 

 J_ of Port Sudan has led to an investigation of the district, and some 

 interesting water analyses, relating both to the Valley Fill and to 

 the Maritime Plain, have been made. Through the kindness of 

 Capt. Kennedy, E..E., Director of Public Works, and of Dr. Balfour, 

 Director of the Wellcome Research Laboratories, I am able to quote 

 some of them. The analyses are given on p. 318 and have been made, 

 as indicated, either at the Chemical Research Laboratory, Khartoum, 

 in charge of Dr. Beam (W.R.L., Khartoum), or by Mr. Lucas, 

 Superintendent of the Egyptian Survey Department Laboratory, Cairo 

 (S.D.L., Cairo). A rough map of the district (Fig. 2) shows the 

 positions of the localities from which the samples were obtained. 



The first six analyses relate to Khor Arbat : I, II, and III are from 

 samples taken 21, 9, and %h miles respectively up-stream of the place 

 where the valley debouches on to the Maritime Plain, and where the 

 fourth sample was obtained. A steady increase is shown in the 

 content of salts as the water passes down the valley. The first 

 analysis is of a solitary sample, and waters containing as little or even 

 less solids in solution have been obtained near the locality to which 

 II relates. The other analyses are in each case selected from a large 

 number, and may be regarded as typical. 



The fifth analysis represents the composition of some flood- water 

 that passed out of the valley. The figures are not as high as those 



