AMAROUCIUM FALLAX. 17 



8. Amaroucium fallax (Johnston) Auct. 



(Fig. 90.) 



Aplidium fallax JOHNSTON in Loud. Mag. Nat. Hist. VII 

 [1834], p. 15, f. 4; FORBES & HANLEY Brit. Moll. I 

 [1848], p. 11 (excl. tigs.) ; [ALDER & HANCOCK in Trans. 

 Tynesicle Nat. Field Clnb, I (1848), p. 203; COCKS in 

 Rep. R, Cornw. Poljt. Soc. for 1849 (1850), p. 73; 

 THOMPSON in Rep. Brit. Assoc. for 1852 (1853), p. 293; 

 GOSSE Man. Marine Zool. II (1856), p. 32, f. 43;] 

 THOMPSON Nat. Hist, Ireland, IV [1856], p. 361 ; [H. & 

 A. ADAMS Gen. Recent Moll. II (1858), pi. cxxxiv, ff. 4, 

 4a; DICKIE in Rep. Brit, Assoc. for 1857 (1858), pp. 

 105, 111 ; ANSTED & LATHAM Channel Isl. (1862), p. 219 ; 

 GRDBE in Abh. schles. Ges. vaterl. Cultur, 1868-69 

 (1869), pp. 105, 125]. 



Coloni/ (fig. 9(3, A) sub-globose or papillary, gela- 

 tinous, of a clear honey-yellow colour marked on the 

 upper surface with white and brown specks from the 

 contained animals ; orifices circular, protuberant, plain, 

 and entire. Individuals (fig. 96, B) scattered irregularly. 

 Branchial aperture 6-lobed ; atrial elongate, linear, 

 entire. Stomach large, yellowish-brown, mottled. 



Heif'/ht of general mass about half an inch (12 mm.). 

 Length of individuals two lines (4mm.). 



Hal. On old shells from deep water. [Attached 

 to under surface of stones, sides of rocks, etc. (Cocks) ; 

 in 7-20 fathoms (Dickie).] 



ENGLAND. [Falmouth, Cornwall (Cocks).] Isle of 

 Man (Forbes). 



SCOTLAND. Berwick Bay, Berwickshire (Johnston). 



IRELAND. North-east coast (Thompson). [Strangford 

 Lough, Castle Ward Bay, Down (Dickie).] 



First record. Johnston, 18-34. 



Dr. Johnston observes that this species " differs 

 from Aplidium //V//.s- in having the apertures in the 

 common envelope entire, whereas in A. ficus they are 

 distinctly cut into six equal rays." The weight of 

 this observation seems doubtful, as the apertures 

 appearing on the surface usually belong to the indivi- 



ui. 2 



