44 ANOMIADZ. 
frequently taken delicate, pale, dirty white-brown shells with 
similar markings, without an appearance of the green insides, 
and instead of the vermilion animal, they presented a pale 
yellow aspect; in addition, I have taken from rocks hauled 
up from the coralline zone, A. ephippium of 3 imches dia- 
meter, with and without anastomosing striz, and the insides 
varying from green to light brown and white; and I have 
little doubt that all the variations I have mentioned are those 
of the type, A. ephippium, which under no circumstances loses 
its characteristic squamous character. 
With regard to the young or dwarf 4. ephippium, A. squa- 
mula, A. aculeata, and A. striolata, grouped and crowded on 
the Pectines, I believe they are mere dwarf varieties of the 
type; these often adopt the markings of the substances on 
which they are fixed, and as often show a complete disregard 
thereto. I have seen shells combining all the supposed di- 
stinctive marks in one individual, in which the decided, smooth, 
glossy A. squamula has commenced the umbonal part of the 
structure, gradually in respect of the middle portion, gliding 
into the squamous A. ephippium, and dividing the basal part 
right and left, the one into the asperities of the A. aculeata, 
the other into the delicate smooth striule of the variety A. 
striolata. Nothing is more common than to see shells half 
A. squamula and half A. ephippium, and other admixtures of 
the characters of two or three supposed species. The last- 
named four varieties are also found at the roots of Alge, but 
both in colour and the union on the same shell of each other’s 
distinctive marks, they present the same imcongruities and 
discrepancies as their brethren on the Pectines. 
The A. cylindrica or A. cymbiformis, a variety of the 
A. ephippium, takes its hollowed appearance from embracing 
the roots of the Fuci; the A. tubularis, another variety of 
the type, has the margin of the aperture elongated, to suit its 
condition to some irregularity of the substance on which it is 
placed. The 4. punctata is also a young A. ephippium with 
papille-like eminences on the convex valve, and corresponding 
depressions on the flat one, arising from similar markings on 
the substances on which they are fixed. I do not know the 
