58 THE INVERTEBRATE FAUNA 
six-rayed branchial aperture, falls into 
the sub-genus Amaroucium of Giard’s 
system of nomenclature. 
Aplidium proliferum (Milne-Edwards). 
This species also belongs to the sub-genus 
Amaroucium. Itis not uncommon at low 
water mark and in the upper laminarian 
zone at Elie. 
In the Hdinburgh New Philosophical Journal for 1838 
(vol. xxvi., p. 155), Sir John Dalyell gives an account, under 
the name of Aplidiwm verrucosum, of a compound Ascidian 
which was dredged to the south-east of Inchkeith, and 
brought to him by the fishermen. 
Parascidia forbesi (Alder). 
This species, the Sidnywm turbinatum of 
Forbes, and Circinaliwm concrescens of 
Giard, was obtained from the Isle of May. 
P. flemingi (Alder). 
Also from the Isle of May on rocks (Flem.). 
DIPLOSOMID A. 
Pseudodidemnum gelatinosum (Milne-Edwards). 
The Didemnum gelatinosum of Milne- 
Edwards and other authors. 
We have taken small colonies of this 
species near low water mark at Wardie. 
We hope in time to add largely to the above list of Tuni- 
cata. There are many species known to inhabit the North 
Sea which we may reasonably expect to find in the Firth of 
Forth, especially towards the mouth. Clavelina lepadvformis 
is recorded from St Andrews by Dr M‘Intosh, and from the 
Northumberland coast by Mr Hancock ; it will doubtless be 
found within our area also. Other species, such as Botryl- 
loides leachi (St Andrews, M‘Intosh; and Northumberland, 
Alder), Polyclinum aurantium (Cullercoats, Hancock), and 
Polycarpa tuberosa (Aberdeen, Macgillivray; and Cullercoats, 
Alder), will, we expect, be also obtained when the Firth of 
Forth, and especially its outer part, has been more thoroughly 
worked. 
