300 



THE DERMAL SKELETON. 



to separate from the main canal, ultimately opening directly to the exterior 

 by a single canaliculus. 



At d, large elongated lacunae are seen, some of th^m constricted transversely 



Fig. 206.— Section of bony trabeculae from the shield of an old Limuius, showing the shape and arrangement of the 



lacunas and canaliculi; highly magnified. 



Fig. 207. — A, Section of the chitenous investment of the oesophagus of Limuius, showing the deeply stained 

 chains of spindle-shaped bodies between the chitenous lamellEE. Delafield's hematoxylin. B, Section of the 

 flexible chiten in the olfactory region, showing the minute, deeply stained, nuclear-like bodies in the pire canals. 

 Heematoxylin. 



as though about to form several smaller lacunae, although this appearance is not 

 as common as the branched one described above. At e, are a few lacunae belong- 

 ing to a trabecula running at right angles to the plane of the paper. 



