1921I.] B. PRASsHAD : Gastropod Molluscs. 227, 
America, Moreover the structural characters of N. jordani and its 
allies do not justify their inclusion in the group Semicirculatae. 
Preston, following Locard! and Dautzenberg,® assigns these 
species to the genus or subgenus Theodoxis or rather Theodoxus, 
Montfort. This is certainly wrong, since Montfort’s name Theo- 
doxus, as both von Martens and Kobelt have shown, should be 
reserved for the Palaearctic species of the fluviatilis type; the 
shells of the jordant type being included in the subgenus Nert- 
taea, Roth. 
Dr. Annandale recorded four species of the genus Nerttina 
from Tower Mesopotamia. I have, however, found specimens of 
another in the collections made by Dr. Bowell at Basra. This 
form (N. macrii var. michom) was only known hitherto from Syria 
and Palestine. 
Neritina mesopotamica (Mousson), Martens. 
1874. Neritrna meridionalis, var. Mesopotamica, Mousson, op. cit., p. 
36. 
1874. Were anatolica, var. Mesopotamica, v. Martens, op. cit., 
PP- 33, 34) pl. v, fig. 42. Ye 
1879. Neritina mesopotamica, v. Martens, of. cit., pp. 90, 91, pl. xin, 
figs, 20, 21. 
1899. Neritina mesopotamica, Kobelt, op. cit., p. 4, pl. ccxi, fig. 1325. 
Mousson confused this species with the Sicilian N. meridion- 
alis and gave a very incomplete description of his new variety 
mesopotamica. ‘The same form was also described in the same 
year by von Martens under the same name as Mousson’s, but 
apparently in ignorance of his work. Von Martens considered it 
to be a form of N. anatolica, but published a full description and 
a good figure, and also compared the variety with the species 
N. michoni and N. bellardit. Later in his monograph of the genus 
he considered it to be a species distinct from N. anatolica and 
worthy of specific rank. I have compared the single Mesopota- 
mian specimen before me with specimens of N. macriz, var. michonz, 
from Palestine and Mesopotamia and with those of N. anatolica, 
var. bellardit, {rom Damascus, and am of opinion that the species, 
as von Martens decided, is distinct from either. 
The single Mesopotamian specimen was collected by Dr. 
Boulenger on the banks of the Khandag creek, Basra. The spire 
of this specimen is not so prominent as is shown in von Marten’s 
figures, but in other respects closely agrees with his figures and 
description. ‘The inner lip is straight and has minute denticula- 
tions on its inner border. 
Neritina macrii, var. michoni (Bourg.). 
1879. Neritina Macrii, var. michoni, von Martens, of. cit., pp. 88-90, 
pl. iv, figs. 11-13 and pl. xiii, figs. 27-29. 
1 Arch. Mus. Hist. Nat. Lyon, UI, p. 231 (1883). 
2 Rev. Biol. Nord. France, V1, p. 340 (1894). 
