58 THE INVERTEBKATE 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. It is not uncommon at low 

 water mark and in the upper laminarian 

 zone at Elie. 

 In the Edinburgh New Philosophical Journal for 1838 



(vol. xxvi., p. 155), Sir John Daly ell gives an account, under 



the name of Aplidium 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 Sidnyum turbinatum of 

 Forbes, and Circinalium concrescens of 

 Giard, was obtained from the Isle of May. 



P. flemingi (Alder). 



Also from the Isle of May on rocks (Flem.~). 



DIPLOSOMID^E. 

 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 lepadiformis 

 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), Polydinum 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. 



