iOO 



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 them constricted transversely 



B 



u 



FIG.. 206. Section of bony trabecula? from the shield of an old Limuius, showing the shape and arrangement of the 



lacuna; and canaliculi; highly magnified. 



,-, /v ' >. - , 



5 - -.V,;-v - " ?--- 

 i ' - -. - " - , 



FIG. 207. .4, Section of the chitenous investment of the cesophagus of Limuius, showing the deeply stained 

 chains of spindle-shaped bodies between the chitenous lamella?. Delafield's haematoxylin. B. Section of the 

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

 Haematoxylin. 



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

 as common as the branched one described above. At c, are a few lacuna? belong- 

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



