822 LARVAL CESTODE PARASITES OF FISHES— LINTON. vol.xix. 



10. Cyst with blastocyst and embryo from Stenotomus chryaopa. Enlarged twenty- 

 two times, life. 



11. Embryo removed from cyst (fig. 10). Enlarged, life. 



12. a and b, parts of ])robosci8 of same (tig. 11), showing retractor muscles (r m) 

 and granular ribbon (g) through the transparent walls. Enlarged two hundred and 

 twenty-five times, life. 



13. Optical section of contractile bulb of embryo shown in fig. 11, showing inser- 

 tion (»i) of retractor muscle of proboscis, life. 



14. Eliyncliohothrium from intestine of Carcharias Jittoralis. Enlarged ten times. 



15. Part of body of same showing racemose bodies. Enlarged two hundred and 

 twenty-five times. 



16. Hooks from retracted proboscis of same, large hook near base, small hook near 

 middle or toward apex of proboscis. Enlarged three hundred times. 



17. Embryo from cyst in Pomatomns sallatrix. Enhirged three times. 



18. L:i feral view of head of same. Enlarged twenty-seven times. 



19. Hooks from retracted proboscis of same. Enlarged three hundred times. 



Plate IV, 

 RhynchobotliriuDi larvce. 



1. Cyst with blastocyst and embryo from C}/)toscion regalis. Enlarged eighteen 

 times, life, 



2. Blastocyst from Mustelus canis. Enlarged three times. 



lihynchobotln-iitin heterospiiie, Linton, from AnyuiUa chrysypa. 



3. Blastocyst (b) inclosed in a hyaline envelope (h) and containing an embryo (e). 

 Enlarged, life. 



4. Embryo removed from blastocyst (fig. 3). Enlarged twenty-two times, life. 



5. Contractile bulb and beginning of proboscis sheath, diagrammatic representa- 

 tion of diagonal muscles, life. From embryo (fig. 4;. 



6. Optical section of same: a, proboscis sheath; b, wall of bulb; c, central cavity 

 filled with fluid which is forced out into the proboscis sheath by the contraction of 

 the muscular walls of the bulb, thus catising the proboscis to unroll; ri, retractor 

 muscle inserted on the wall of the bulb and attached to the tip of the proboscis. 

 The contraction of the longitudinal fibers of this muscle retracts the proboscis, life. 



7. Anterior end of bulb, optical section, more enlarged, letters same as in fig. 6, 



8. Hooks from proboscis of embryo (fig. 4). Enlarged three hundred times. 



Rhyttchoboihrium imparispine, Linton, from Lophius piacaiorius. 



9. Cyst. Enlarged al>out three times, life, 



10. Blastocyst Irom same, compressed to show embryo. Enlarged nine times, life. 



11. Embryo with blastocyst attached as nutrient vessel. Enlarged six times, life. 



12. Hooks from proboscis of same. Enlarged three hundred and forty times. 



Rhynchobothriiim spi'ciosiim, new species. 



13. Embrj'o removed from cyst, peritoneum of Pomatomits saliairix. Enlarged 

 three times. «, bothrium. Enlarged six times. 



14. Optical section of neck of living specimen from P. saltatrix. Enlarged eight- 

 een times, c, cuticle; (7/., granulo-fibrous layer; r/., vascular layer; /mi., longitudinal 

 mus<les; Pm., parenchyma; ah., proboscis sheath; rm,, retractor muscles of probos- 

 cides; Pr., retracted proboscis. 



