220 Records of the Indian Museum. [Vou. XVIII, 
I. Shell with a distinct transverse constriction on the 
body-whorl. 
A. Shell not more than 8 mm. in maximum diame- 
ter; more or less ovoidal in shape .. WM. gordant typtca. 
B. Shell measuring up to 15 mm. in maximum 
diameter ; almost subcylindrical in shape 
and with the constriction of the body-whorl 
better marked than in the typical form —.,..- NV. gordant, var. 
turrts. 
II. Shell with the body-whorl almost smooth or with 
only a faint transverse constriction across it ... NN. jordant, vat. 
aberrans. 
The major part of the Palestine collection reported on by 
Preston and the shells from the Lake of Tiberias from the late 
Dr. Anderson’s collection belong to the typical form (fig. Ia). 
They have the shell of an ovato-conical form with a prominent 
spire and a distinct though not very deep constriction across the 
Ay. 2\k\ 
SS 
if 
Fic. 1.—Neritina jordani, Sowerby. 
a. Shell of the typical form from Palestine. 
6. Shell of Mousson’s var. turvris from River Jordan. 
c. Shell of var. aberrans, Dautzenberg, from Mesopotamia. 
body-whorl. The colouration is. variable. Most of the speci- 
mens have zigzag vertical stripes of a red, chocolate or dark brown 
colour alternating with white stripes of the same shape, in a few 
cases the stripes coalesce here and there to produce a reticulate 
pattern ; still further, a few have a uniform dark-brown or black 
colour with only a few pale spots. The specimens which Preston 
regarded as being of an intermediate character between his 7. 
michont and T. jordani are no more than uniformly coloured speci- 
mens of this form of N. jorvdani and have no relationship with 
N. macrii, var. michont. 
The var. ¢urris of Mousson (fig. 18) is, as I have stated above, 
represented by specimens from the River Jordan only. These 
are much larger, of a subcylindrical shape, have a much less promi- 
nent spire and the constriction on the body-whorl is much more 
impressed. In colour the shells show great variation ; the stripes 
are of various colours as in the typical form but are narrower and 
