36 
Journal of the 
with the pinna, and near it, with a series of sarcotliecs© on each 
side; (6), with all the leaflets free, bordered with sarcothecce on 
both edges, forming an open corbula. 
Colour, yellowish brown, upper part very pale. Ilab. Queens- 
cliff (\V. M. B., Mr. Goldstein). 
This species very closely resembles a British one sent to me by 
Mr. Barnard, and said to be A. pluma , though I cannot identify 
it with Mr. Hincks’ figures of either that species or A. tubulifera. 
It agrees with A* parvula in the form and size of the lateral 
sarcothecie, in the two constrictions of the hydrothecal internode, 
and in the opening from the calycle to the mesial sarcotheca; and 
in all these points they differ from Mr. Hulks’ figures of A. pluma , 
especially in the lateral sarcothecce, which he shows very minute. 
In both species these organs appear in front view like those of 
A. tubulifera in form, but they are almost entirely concealed 
beneath the hydrotheca, and can only be seen by focussing down 
through it; while in A . tubulifera , as represented by Mr. Hincks, 
they are free from the calycle, and project in advance of it. In 
the English species referred to, the front of the calycle is incurved 
between the mesial sarcotheca and the aperture, and all the 
marginal teeth of the latter are much everted ; in A. parmtla the 
median tooth is incurved, and the two next to it are the only ones 
noticeably everted ; in the English species there are four teeth 
on each side, in A. parvula five; in the latter, the two posterior 
teeth on each side are large, generally projecting considerably in 
advance of the lateral sarcotheca? ; in the former, these teeth are 
much smaller than those near the front, the last one usually 
proceeding parallel with the sarcotheca, and close to it, and not 
projecting beyond it. The lateral sarcotheca? seem a trifle more 
erect in the English species, and being opposite to the incurved 
front, the calycle appears in lateral view more narrowed below the 
aperture than in A. parvula . Both species agree in the cauline 
sarcotheca?. A. pamula is usually about half an inch in height, 
and principally remarkable for the different modifications of the 
corbula which it presents. 
A. McCoyi. n . sp. Plate XIV, fig. 2. 
Shoots nearly an inch in height, pinnate ; pinnae approximate, 
nearly straight, ascending, alternate, one to each internode, both 
