146 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 
thick outer body wall, but surrounded by a mass of connective 
tissue as well. The nerve which it receives is extremely minute 
when compared to the nerve which goes to the rhinophores, for 
instance, and there is no organized retina. 
The rhinophores are situated well forward and somewhat 
at the sides of the head. They consist of a stout central stalk 
divided transversely into twelve prominent leaves. The length 
of the central stalk is about 0.6 mm. in the contracted condition. 
When retracted, the rhinophores are completely withdrawn into 
a little cavity in the integument, the upper surface of the rhi- 
nophore being at a level with the opening of the cavity. In 
section it may be seen that the lamelle are covered by an epi- 
thelium of tall, slender cells with small, darkly-staining nuclei 
in the basal portion. These cells appear to bear short cilia, but 
not nearly such prominent ones as those in some other places, 
as the foot. A very large nerve enters the stalk of the rhino- 
phore and gives five branches to the lamelle. Muscle fibres 
run up the sides of the stalk and these also send a few fibres 
to the lamella. The rhinophores are by far the most highly 
developed sense organs of L. cockerelli. 
The tentacles and the sub-pallial ridge receive large nerves 
which end close to their upper surfaces, which are somewhat 
lamellated and bear a ciliated epithelium. 
Tue Repropuctive System. The hermaphroditic gland is a 
racemose gland extending over the upper surface of the liver, 
below and between the branches of the nephridia. It reaches 
down on both sides below the level of the papillae and extends 
well over the caudal and cephalic ends of the liver. The sper- 
matozoa develop in large follicles, each surrounded by several 
smaller ovarian follicles which open into it. The spermatic 
follicles open into small ducts which come together to form the 
large duct of the hermaphroditic gland. In all but one of the 
specimens examined, both ova and spermatozoa were develop- 
ing. In that one the female organs were dormant and the ova 
had only just begun to develop. The ovarian follicles usually 
contain several ova in various stages of growth as well as small 
cells with a darker-staining protoplasm that were wedged in 
