56 Introduction to Animal Morphology. 



unequal flagella (Heteronema*). Dinobryon has a loose 

 lorica, and reproduces by continuous gemmation ; hence it 

 appears as a branched colony, each plastide of which has a 

 pigment speck (absent in Epipyxis).f 



Order 2nd. Noctilucae transparent, phosphorescent, glo- 

 bose, metabolic animals, about - H W,r". The body has a 

 wide depression on one side (atrium), and a flagellum, con- 

 sisting of a clear cuticle over a closely-transversely-striated 

 . arising from a distinct papilla at its base ; near its root at 

 the bottom of the atrium is the mouth, opening into a short 

 oesophagus. On the inner wall of the tube is a ridge, and 

 from its floor springs a long cilium, near which are two brittle 

 rods. The oesophagus ends in a mass of protoplasm, from 

 which numbers of pseudopodia-like threads stretch in a netted 

 manner like a skeleton, to the surface, getting finer as they 

 -oach it; along these threads vacuoles travel from the 

 these threads lies an ertosarc not divided 



into 11 areas, but containin rly disposed 



nuelei. :ction is ! mmation, or by con- 



ation and >n, two individuals having approxim; 



their mouths, their l.o rted. Another method 



is by the formation of swarm-spores (Cienkowsky), the proto- 

 plasm mass segments into 2,4, 8, &C. On the ectosarc (which 

 1-ecomes saccular) arise surface tubercles, which form a disc 

 or boss, each of these becomes zoospore-like, and m 

 about by its vibraculum. 



CLASS 5. PROTOPLASTAH (Hacckcl}. Nucleated plas- 

 tides, having the central granule-, and vacuole-bearing 

 protoplasm (endosarc) surrounded by a firmer dif- 

 ferentiated layer (ectosarc), and often by a cuticle, so 

 that the blunt lobose pseudopodia cannot coalesce 

 when they come in contact (except in Actinophr 



* The tail of the ametabolic Phacus is not to be confounded with a 

 second flagellum. 



f Some of these are probably vegetable. 



\ BadJchy. \ Gosse, Busch. 



[| Lobosa, Carpenter, 



