560 p. W. GAMBLE AND J. H. ASHWOKTH. 



Fig. 15. — A. cristata. Two iieuropodial cligetse from a specimen 475 mm. 

 long from Jamaica. X 500. 



Fig. 16. — A. cristata. A neuropodial chseta from a specimen 120 mm. 

 long from Captiva Key. x 180. 



Fig. 17. — A. cristata. A neuropodial chaeta from a specimen 300 mm. 

 long from Naples. X 180. 



Figs. 15, 16, 17, should be compared to show the change in the 

 inclination of the rostrum to the shaft of the cheeta, and the decrease in 

 size of the teeth with advancing age. 

 Fig. 18. — A. ecaudata. The ventral portion of a neuropodium of a 

 specimen about 160 mm. long (from Port St. Mary, Isle of Man), showing the 

 stages in development of the clisetse. The line marked Nm. is the outline of 

 the neuropodium. The chsetse bear two or three teeth, but are devoid of pro- 

 cesses. X 180. 



Fig. 19. — A. ecaudata. Three neuropodial chsets from a post-larval 

 specimen 7'2 mm. long from Port Erin, Isle of Man. Oue of them bears a 

 small process under the rostrum. X 1000. Compare with Fig. 18. 



Fig. 20.— a. ecaudata. 



Fig. 20 a. — A notopodial seta from a specimen about 160 mm. long. Note 

 that the seta gradually tapers to a very long slender tip. Under this magnifi- 

 cation the minute barbs or processes are not visible. The seta is 3*02 

 mm. long. X 43. 



Fig. 20 b. — The distal tenth of the same seta, showing the minute barbs. 

 X 350. 



Fig. 20 c. — A portion of the same seta from the region marked +, more 

 highly magnified, x 2000. The notopodial setae of A. Grubii are identical 

 with this. 



Fig, 21. — A. ecaudata. 



Figs. 21 a and 21 c represent two notopodial setse from a post-larval 

 specimen 7"2 mm. long from Port Erin, x 366. 



Fig. 21 b. — The distal portion of the seta shown in Fig. 21 A more highly 

 magnified, to show the barbs and lamina. X 1000. 



Fig. 22. — A. Grubii. Three neurojjodial chfetae from a medium-sized 

 specimen from Port St. Mary. The teeth are small, and each chaeta bears a 

 minute blunt process (Proc). These chaetae are practically identical with 

 those of A. ecaudata shown in Fig. 18. The minute process is not a constant 

 character of the chaetse of either of these two species, x 180. 



Fig. 23. — A. Claparedii. 



Fig. 23 a. — The distal fourth of a notopodial seta of a specimen about 

 70 mm. to 80 mm. long from Naples, to show the numerous barbs or 

 procesbcs. X 350. 



