OF THE FIRTH OF FORTH. 57 



Dr M'Bain mentions it in his list, and we 

 dredged some large specimens in 10 to 20 

 fathoms, east of Inchkeith, last summer. 



Botryllus calendula ? (Giard). 



We refer provisionally to this species 

 some specimens of a rather delicate 

 Botryllus which we dredged last summer 

 in 14 fathoms, off Longniddry. The speci- 

 mens were encrusting large individuals of 

 Ascidia virginea. 



Botryllus calendula was described by 

 Giard * from Eoscoff, on the coast of 

 Brittany, where it is stated to be very rare. 



Botrylloides nibrum (Milne-Edwards). 



The specimens which we have found in 

 the Firth of Forth have belonged to the 

 yellow varieties f of the species, and not 

 to the typical red form. They were from 

 Elie, and were taken at low water mark 

 at spring tides. 



B. radiata ? (Alder and Hancock). 



A few specimens which we found along 

 with the last species may be referred pro- 

 visionally to Botrylloides radiata. It is 

 possible that this species may be merely a 

 variety of B. rotifer a (M. Edw.). 



B. allicans (Milne-Edwards). 



We have obtained this species at low 

 water mark near Newhaven. 



POLYCLINID^l. 



Aplidium caliculatum (Savigny). 



We obtained a large specimen in an ex- 

 cellent state of preservation from the 

 stomach of a cod last summer. 

 This species, having a long filiform post- 

 abdomen, a channelled stomach, and a 



* Recherches sur les Synascidies (Arch. Zool. exper., t. 1, p. 623, 1872). 

 t See Giard, loc. cit., p. 632. 



