116 



CrLETOPTERHLE. 



basement-membrane, thickened in the mid-dorsal line on each side of the median hypo- 

 dermic ridge. In G. variopedatus a longitudinal band of cilia occurs on the dorsum of the 

 first region, and is followed by the ciliated middle region (Lubischew). The hypoderm 

 consists of a series of closely arranged and vertically elongated (columnar) cells, the whole 

 under a low power having a striated aspect. The glands pour out much phosphorescent 

 mucus, to be alluded to subsequently, which Claparede found to render by its mixture 

 an entire basin of water luminous. The same author noted bacilliparous glands in the 



TVC 



vm. 



Vert.TU 



Fig. 111.— Transverse section of the anterior region of Chmtopterus variopedatus, Eenier. 



group. The basement-tissue rests ventrally on a circular coat (cm.) into which a series 

 of vertical strands run, separated by spaces, and clasping isolated bundles of longitudinal 

 fibres which appear to represent independent muscles (Fig. 111). These vertical fibres 

 fuse into a sheet about one-third of the distance upward, and many pass through the 

 dorsal longitudinal muscles to join the circular layer. Those adjoining the muscular 

 sheath of the alimentary canal mingle their fibres with it. The wing-like process at each 

 side seems to be a modified foot, and the muscles from the bristles likewise spread upward 

 through the dorsal longitudinal at its outer border. The muscles connected with the 

 bristles of the fourth foot are of great strength and fitted for important functions. Those 

 fixed to the bases of the bristles are often separated and thus their actions would appear 

 to be capable of differentiation. A section through the fourth foot and its great bristles 



