PLATE II. 
AM. stands for 
An. ,, 
c. 
CI.-CVI. 
CA. 
C'.gl. 
E. 
e . ,, 
Gl.-G VI. 
GS. 
GT. 
adductor muscle, 
antennae. 
coeca attached to oesophagus, 
thoracic appendages, 
caudal appendage, 
cement-glands, 
the large compound eye. 
the simple eye. 
thoracic ganglia, 
supracesophageal ganglion, 
thoracic ganglion. 
Int. stands for intestine. 
Inv. „ invagination dividing the body into a capitu- 
lum and peduncle. 
M. ,, mouth. 
Ma. , , mantle. 
Od. ,, ovarium with oviduct. 
CE. ,, oesophagus. 
Op. ,, orifice of the mantle. 
Sh. , , shell. 
S or St. stomach. 
Fig. 1. Cypris-larva of Lepas australis, Darwin, sagittal section ; magnified 70 diameters. 
Fig. 2. Same larva in a slightly older stage, longitudinal section ; magnified 70 diameters. 
Fig. 3. Cypris-larva of Scalpellum regium (Wyv. Thoms.), Hoek, which is destined to 
develop into a male ; magnified 94 diameters. 
Fig. 4. Cypris-larva of Scalpellum triangulcire, Hoek, which is also destined to become 
a male ; magnified 94 diameters. 
Fig. 5. Group of cement-cells with their ducts and pale yolk-elements of the Cypris- 
larva of Lepas australis, Darwin ; magnified 275 diameters. 
