424 
THE SUDAN 
numidica, Eeeve, as represented in Fig. 7 on the same plate. Two of 
these occurred at Hillet Abbas and the other at Fachi Shoya. All the 
specimens were dead with only portions of the epidermis preserved. 
Two living examples of Succinea rugulosa , Morelet, were found on 
water plants (“umm Suf ”) at the edge of the White Nile at Gebel En. 
The Swedish zoologists in 1901,—and they were the first to record 
it from this district,—also took but two specimens, at Gebel Ahmed 
Agha, a little further south. Theirs, however, are much smaller than 
mine, which come nearer to the type in dimensions, one of them being 
8 mm. in length and 4*5 mm. in width. They were likewise the 
first to take at the same locality Isidora sericina, Jickeli, which had 
previously only been recorded from districts north-east of Abyssinia. 
They, however, got but one small specimen, whereas I took six, one 
at Gebel En and five at Hillet Abbas, four of which were alive, and 
the first if not alive when taken was quite recently dead. Again 
my largest is nearer the type in size than theirs as it measures 
9*5 mm. in length and 6*5 mm. in width. All were on water-plants. 
Another species which the Swedes were the first to record from the 
White Nile, Planorhis boissyi , Pot. & Mich., was taken by me at Gebel 
En (six), Hillet Abbas (four) and Fachi Shoya (two); they were on 
the mud and were mostly in good condition, but only one was alive. 
I found eight living specimens of Melania tubermlata, Mull., near 
Mogran, and kept them alive for a time to observe their movements: 
the animal advances slowly and then brings its shell forward with 
a jerk. E. Hagg only mentions one of this species, which was met 
with at Mahmudia some forty miles further south. 
The largest example of Ampullaria kordofana, Parreyss, was 
taken at Kosti. It was dead but the epidermis was well preserved ; 
the length measures 66 mm. and the width equals 56*5 mm. Three 
smaller shells were found at Gebel En, two of which were alive; three 
at Tawila, two of which also were alive; and one at Hillet Abbas. 
A muddy creek among water-plants at the latter place was 
especially productive, and here I took my finest specimen of 
A. wernei , Phil., its length equals 93 mm., and its width, 95; 
another is nearly as large; these and several of smaller dimensions 
were alive. This species was also taken at Gebel En, Fachi Shoya 
and Tawila. 
Lanistes bolteni, Chem., occurred at Gebel En, Hillet Abbas, 
Fachi Shoya, and Tawila, altogether about thirty examples were 
found, of which only seven were living. 
Numerous specimens of the variable species Cleopatra bulimoides , 
Oliv., were taken. Those from Mogran were the largest and had the 
