502 MURICIDA. 
belong to this section, and also M. Trevillianus, M. turricula, 
M. rufus, and M. nanus, none of which we have met with 
alive. We refer to figures of them. 
M. tergs, Forbes. 
Mangelia teres, Forbes et Brit. Moll. ii. p. 462, pl. 113. f.1, 25 (ami- 
mal) pl. R.R. f. 3. 
M. Levrroyi, Michaud. 
Mangelia Leufroyi, Brit. Moll. iii. p. 468, pl. 113. f. 6,7; (animal) 
pl. RR. £1. 
M. nanvs, Loven. 
Mangelia nana, Brit. Moll. ui. p. 461, pl. 112. f. 8, 9. 
M. turricuta, Mont. 
Mangelia turricula, Brit. Moll. in. p. 450, pl. 111. f. 7, 8; (animal) 
105 yd Sea Miss 2 
M. rurus, Mont. 
Mangelia rufa, Brit. Moll. in. p. 454, pl. 112. f.3, 4,5; (animal) 
pl. /T.T. £4: 
M. Trevituianvs, Turton. 
Mangelia Trevilliana, Brit. Moll. in. p. 452, pl. 112. f. 1, 2. 
I have to say a few words on the gland which is seen in 
many species of the Muricide, and is conspicuous in the 
Murex lapillus (Purpura of authors), and which has been 
considered by naturalists to be the organ that produced the 
ancient far-famed Tyrian purple dye. The gland is of a white 
or green colour; it lies between the mucous fillets and the 
ovarium on the right side of the animal; it is of lear 
form, and though in some species it appears of a dark green 
colour, the juice or secretion, when extracted and exposed to 
the air and sun, assumes a purple hue. It is doubtful from 
what species this famous dye was obtained ; it can scarcely 
have been from the Murex lapillus, as Lamarck’s commentators 
say that species does not inhabit the Mediterranean— 
. * Tyrioque ardebat Murice leena.”’ 
. “te bis Afro 
Murice tinctee 
Vestiunt lane” . ; 
. © Vestes Geetulo murice tinctas.”’ 
