Parker, 07i Miliola. 
55 
to me to be specifically the same, belonging to one charac- 
teristic genus. 
Hauerina. — The next step from the simplicity of Cornuspira 
is seen in the definite and nearly regularly recurring con- 
striction in the whorls of Hauerina. In the young state of 
this generic form (of which I can only recognise one species) , 
the departure from the planorboid shape is less than it is in 
the adult state, which has put on a somewhat three-sided or 
four-sided outline from the arrangement of the outer whorls, 
in which three chambers usually form the circuit. The 
chambers are here generally delicately striated in some 
varieties ; otherwise smooth. 
Sph(Broidina. — In Sph(Broidina we have the folding of 
chamber over chamber on the two sides of the axis alternately, 
the chambers being somewhat globose. This alternation in 
the position of the chambers is soon interfered with by their 
inclination to take a uniserial arrangement, an irregularly 
concentric, or a branched or cervicorn form. These secondary 
plans of growth are subject to much irregularity in the 
Sphseroidina in this East Indian fauna. 
The Sphseroidinse present two characteristic types of form ; 
namely, those Avith very inflated chambers, having a slight 
valve on the aperture; and those with pleno- convex cham- 
bers, without a valvular process ; the latter group have greatest 
irregularity of shape. In these I recognise two species. 
Vertebralina. — A fourth form of growth is seen in another 
genus, Vertebralina, which is well characterised by a pecu- 
liarly patulous opening to the shell, and by a well-marked 
uniserial arrangement of the later chambers. The gaping 
shape of the aperture in young Vertebralinse soon gives a 
conspicuous breadth to the chambers_, which, where they 
have taken on the straight mode of arrangement, form a 
regular succession of adpressed, vase-shaped chambers, occa- 
sionally (in the so-called " Articulina") as narrow as the axis 
of a coralline, and sometimes forming a series of uniform 
width, distantly resembling in outline a shark^s vertebra, or, 
at the other extreme, widened out to a successively greater 
and greater extent, until affecting an irregular triangular 
outline. Vertebralina is almost always striated, delicately 
sulcated, and ribbed in the direction of the axis of the shell. 
This genus presents but one true species. 
Miliola. — Recurring to the uniform alternation of cham- 
ber on chamber alternately on two or more sides of the shell, 
as seen in the embryo and young forms of Hauerina and 
Sphaeroidina, we have the form of Miliola, and amongst the 
innumerably various forms of this genus I can see only one 
