BEACHIOrODA. 



391 



Animal with tlie mantle-lobes firmly adliering to the shell, 

 and united to the epidermis, their margins distinct, and fringed 

 all round ; branchial veins giving off numerous free, elongated, 

 narrow looi:)s from their inner surfaces ; visceral cavity occupy- 



/' llllUlll lUiu 



Fig. 202. Doisal.* Fi^?. 203. Vential. Fig. 204. Vential. 



Lingida anatina, Lam. (criginal). Stjn. Patella imgiiis, L. (part.) 



a a, anterior adductors ; a', posterior adductor ; p p, external adjusters ; p'p', central 

 adjustors ; r r, anterior retractors (the anterior occlusors of Hancock) ; r'r'r', posterior 

 adjustors ; c, capsule of pedicle ; Ji n, visceral sheath ; o, oesophagus ; s, stomacli , 

 /, liver ; z, intestine; r, vent; 6, branchial vessels ; ??i', mantle margin; 7», inner lamina 

 of mantle margin retracted, showing bases of setse ; s, 8^t£e. 



ing the posterior half of the shell, and surrounded by a strong 

 muscular sheath ; pedicle elongated, thick ; stomach long and 

 straight, sustained by inflections of the visceral sheath ; intes- 

 tine convoluted dorsally, terminating between the mantle -lobes 

 on the right side, oral arms disposed in about six close whorls, 

 their cavities opening into the prolongation of the visceral 

 sheath in front of the adductors. 



Observations on the living lingula are much wanted; the 

 oral arms probably extended as far as the margins of the shell ; 

 and the pedicle, which is often nine inches long in preserved 

 specimens, is doubtless much longer, and contractile when 



* In Fig. 202 a small portion of tlie Hver and visceral sheath have been removed, to 

 show the course of the stomach and intestine. In some specimens the whole of the 

 vis(.era, except a poriion of the liver, are concealed by the ovaries. In Fig. 204 the 

 front half of the ventral mantle-lobe is raised, to show the spiral arms; the black spot 

 ill the centre is tlie mouth, with its upper and lower lips, one fringed, the other plain 

 The mantle-fringe has been omitted in Figs. 202, 201. 



