



PLATE II. 







AM. stands for idductor muscle. 





Int. stands for intestine. 





An. 



antennae. 





Inv. „ 



invagination dividing the body into a capittjT 



a. 



coBca attached to oesophagns. 







lum and peduncle. 



'-i 



CI.-CVI. 



thoracic appendages. 





M. 



mouth. 





CA. „ 



caudal appendage. 





Ma. 



mantle. 





C.gl. „ 



cement glands. 





Od. 



ovarium with oviduct. 





-E 



the large compound eye. 





(E. 



cEsophagus. 





e. ,, 



the simple eye. 





Op. „ 



orifice of the mantle. 





a I.-6 VI. 



thoracic ganglia. 





Sh. 



shell. 





"^ ■• 



supracesophageal ganglion. 





S or St. 



stomach. 





OT. 



thoracic ganglion. 











Fig. 1. C37pris-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. Thorns.), Hoek, which is destined to 

 develop into a male ; magnified 94 diameters. 



Fig. 4. Cypris-larva of Scalpellum triangulare, 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. 



