224 POPULAR BRITISH CONCHOLOGY. 



in consequence of the cloak being so small as to leave the 

 head and foot exposed. 



These are the two species of Gonidorus — the G. castanea 

 being of a brown colour, with large, dark brown gills, 

 chestnut-coloured mantle, all minutely speckled with white j 

 and the G. nodosa, of a white general substance, with beau- 

 tiful pale yellow and purple hues. 



Triopa clava comes next : less than an inch long, with 

 brilliant orange-tipped branchiae and tentacles, and orange 

 fingers or filaments, like polypi, arranged all round the edge 

 of his narrow mantle ; and a lively little fellow he looks. 



^GiRUS punctilucens is next in the procession, his body 

 covered with large tubercles, among which are arranged 

 brilliant, lustrous green, eye-like spots. 



Thecacera perniigera and T. virescens, from their small 

 size, creep by almost unobserved, with their smooth bodies — 

 the former covered with bright orange spots, the latter 

 patched with green. 



Idalia, still small, passes by in a group of three species, 

 remarkable for the circle of filaments surrounding the region 

 of the gills, and the four long, tentacular appendages carried 

 in front of the horn-shaped tentacles. The species are — /. 

 asjiera, I. incequalis, and /. quadricornis. 



