10 



ZOOLOGY 



SECT. 



ovaries (ov.) lie in the trunk cavity ; and there is a pair of ovi- 

 ducts (ovd.*) (originally supposed to be eyes) lined by elongated 

 pigmented epithelium. 



Rhabdopleura (Fig. 672) occurs in colonies of zooids organically 

 connected together, and enclosed in, though not in organic con- 

 tinuity with, a system of branching membranous tubes. The 



be* 



Fig. 672. Rhabdopleura. A, Entire zooid. a, mouth ; b, anus ; c, stalk of zooid ; (/, pro- 

 boscis ; , intestine ; /, anterior region of trunk ; g, one of the tentacles. (After Ray Lankester.) 

 B, Diagrammatic longitudinal section a little to one side of the median line, anus, anus-; 

 fee 1 , ccelome of proboscis ; lc%. ccelome of collar ; between fee 1 , and bc'2. is the diverticulum ] be*. 

 coalome of trunk ; int. intestine ; mouth, mouth ; r. rectum. (After Fowler.) 



collar region bears a pair of arms or tentacles, each carrying a 

 double row of slender filaments the whole supported by a system 

 of firm internal (cartilaginous ?) rods. The " notochord " and the 

 nervous system resemble those of Cephalodiscus. A single testis 

 has been found, opening on the exterior by a pore situated 

 near the anus. The female reproductive organs have not been 

 discovered. 



