NEW FORMS OF MARIME DIATOMACEZ. 509 
connection between the segments and the half frustule, which only showed the 
backs of the segments, I postponed it with other forms, all of which I have now 
_ been able to establish as species. I found the present species tolerably frequent 
in Mr Mires’s Corallina gathering, in which detached segments are much com- 
moner than the entire frustules. 
We shall see, farther on, that a similar structure prevails in a numerous sec- 
tion of Amphore, a few of which were described in my last paper on the Glen- 
shira Sand. 
GROUP VI. 
AMPHORZ. 
The new forms of this genus in these materials are very numerous, since, 
‘in addition to almost all those (ten in number) which I had described in the 
Glenshira Sand, they have yielded about 32 additional undescribed species. And 
as I have again to describe and figure four of the Glenshira species, which are 
now better known, there are in all, 36 species of Amphorz to be described and 
figured. As the whole of the British species figured in the Synopsis of Professor 
SmirH amounted only to eight, it appears that the Glenshira Sand, and the Clyde 
and Loch Fine dredgings, or the latter alone, without the sand, have yielded a 
five-fold addition to the British forms of this genus. This may serve to show 
what stores of undescribed forms are yet to be found in our estuaries; for all 
these have been obtained from two localities, namely, Lamlash Bay and the 
upper part of Loch Fine, just below Inveraray. 
The remarkable group of complex Amphoree, to which I have lately directed 
attention, and of which the first known example was A. costata, Sm., though the 
peculiarity of its structure seems to have been overlooked, has now become so 
large (one-half of the species here described belonging to it) that it is necessary to 
subdivide the genus. I shall, therefore describe the Amphoree in two sub-groups, 
viz., A. Simple, and B. Complex Amphore. 
(Since this paper was read, I have ascertained that two of the Amphore in 
the following list of simple species, namely, A. monilifera, and A. spectabilis, be- 
long to the complex division. The latter is indeed one of the most curious of the 
complex Amphoree.) 
A. Simple Amphore. 
73. peeniee pellucida, n. sp. 
63. eld turgida, n. sp. : 
vis, 1. Sp. 
64. nana, n. sp. 74. 
65. x macilenta, n. sp. 75. exigua, n. sp. 
66. ...  angusta, n. sp. 76. -.. dubia, n. sp. 
67. ...  binodis, n. sp. THe -.. truncata, n. sp. 
68. ...  Ventricosa, n. sp. 78. ... oblonga, n. sp. 
69. ...monilifera, n. sp., G 79. ...  Tobusta, n. sp. 
70. ... lineata, n. sp. 80. spectabilis, n. sp. 
71. .... Ergadensis, n. sp. * 81. Proteus, n. sp. 
72. ...  levissima, n, sp. 
VOL. XXI. PART IV. 6x 
