with a revision of thè LimncBidm oj^ Authors. 339 
formed of a number of lobes or tubes whicli are placed on tlie 
inner side of thè liver and extend a short distance be_yond it, 
into thè apex of thè spire. These are fìlled witli a greenish 
substanee consistine^ of nucleolated cells and ova in all stages 
of dcvelopinent which obtain previons to their extrusion. 
The penis is contained in a sac {preputium) which opens on 
thè side of thè neck on a line with thè tentacle and midway 
between thè left tentacle and thè mantle margin. The organ 
is short and stout, thè retractor muscles were quite perceptible, 
and a triangular appendage, perhaps eqnivalent to thè flagel- 
lum,^ was observed at thè posterior end. The vas deferens is 
stender and is nearly enclosed by thè prostatic glande which 
is small and of an ainber color. The epididymis is innch con- 
voliited and nearly as long as thè vas deferens. The testicle is 
long, and composed of numerous minute tubes with innumera- 
ble ramifications. 
Respiratory System. Tlie opening of thè puhnonary cham- 
ber is closed by a lobe of thè mantle. The margin of thè lat- 
tei’ in some individuals is tuberculate (under a high power), 
while in others nothing of thè kind was observed. 
There was no perceptible celinlar structure to thè lung, but 
thè walls of thè chamber are higlily vascular, and it occupies, 
when dilated, nearly half thè last whorl. Myriads of a species 
of cercaria were observed in thè chamber, in some individuals. 
Sp>ecial organs. The eyes are well developed. The choroid 
was thickly covered with black pigment. A well marked vit- 
reous humoT was observed, and there appeared to be a crystal- 
line lens. The sclerotic coat is tough, and traversed by nume- 
rous blood-vessels. The eyeball is of an ovai shape, and thè 
axes of thè two eyes appeared to be somewhat divergent. 
The blind sac, described by Leid}q and which he suggests 
may be thè seat of thè sense of smeli, is quite evident. It is 
a minute linguiform sac, reflected beneath thè buccal mass. 
The auditory vesicle is dose behind it, and is of an ovai 
