1909.] NATURAL SCIENCES OF PHILADELPHIA. 295 



Fig. 26. — Ventral view of mandibles, X 24. 



Pig 27. — Anterior (a) and posterior (6) maxilla; of outer series, X S3. 



Fig. 28. — Anterior maxilla of middle series, X S3. 



Fig. 29. — Anterior (a) and middle (6) maxillae of inner series, X S3. 

 Aricia johnsoni — figs. 30-33. 



Fig. 30. — Tip of stout neuropodial seta from somite X, X 600. 



Fig. 31. — Portion of slender neuropodial seta from somite L, X 600. 



Fig. 32. — Optical section of a portion of a notopodial seta from somite L, 

 X 600. 



Fig. 33. — End of a furcate notopodial seta from somite C, X 600. 

 Naineris robusta — figs. 34-37. 



Fig. 34. — Stout neuropodial seta from somite XXV, X 250. 



Fig. 35. — Slender neuropodial from same, X 250. 



Fig. 36. — Face (a) and profile (6) views of a portion of a capillary notopodial 

 seta from somite C, X 600. 



Fig. 37. — Two furcate notopodial seta? from somite C, X 360. 

 Naineris longa — figs. 38-42. 



Fig. 38. — Stout neuropodial seta from posterior series of somite XX, X 250. 



Fig. 39. — Slender neuropodial seta from anterior series of somite XX, X 250. 



Fig. 40. — Notopodial seta from somite XX, X S3. 



Fig. 41. — Neuropodial spine from posterior series of a middle somite, X 250. 



Fig. 42. — Furcate notopodial seta from middle region, X 360. 



Plate IX. — Fig. 43. — Tharyx multifilis — Anterior end of cotype, X 9. 



Fig. 44. — -Dodecaceria pacifica — Neuropodial spine from somite LXXV, 

 X 250. 

 Pista elongala — figs. 45-47. 



Figs. 45-47. — Uncini from somites V, XIV and XXV respectively, X 250. 

 Pista alata — figs. 48-51. 



Fig. 48. — Limbate seta from somite XV, X 250. 



Figs. 49-51. — Uncini from somite V, XV and XXX respectively, X 250. 

 Polycirrus cal ifomicus— figs. 52, 53. 



Fig. 52.— Uncinus from XX, X 440. 



Fig. 53 —Uncinus from XXXV, X 440. 



Fig. 54. — Polycirrus sp. — Anterior uncinus, X 440. 



Fig. 55. — Notomastus tenuis — Anterior abdominal crochet, X 440. 



Fig. 56. — Eunotomastus gordiodes — Neuropodial crochet from somite XXV, 

 X 360. 



Fig. 57. — Dasybranchus giganteus — Corrected figure of crochet, X 360. 



Fig. 58. — Dasybranchus glabrus — Neuropodial crochet from somite XXV, 

 X 360. 



Fig. 59. — Sclerocheilus pacificus — Quarter view of a posterior furcate seta, 

 X 440. 

 Trophonia capulata — figs. 60, 61. 



Fig. 60. — End of neuropodial seta from somite XXV, X -50. 



Fig. 61. — Notopodial seta of same, X 56. 

 Flabelligera commensalis — figs. 62, 63. 



Fig. 62. — Collar seta, X 56; a, portion of same, X 250; b, distal end of a 

 sensory papilla from collar, X 56. 



Fig. 63. — Neuropodial hook from somite XXV, X S3. 

 Protula superba — figs. 64, 65. 



Fig. 64. — Shorter limbate seta from somite VIII, X 56. 



Fig. 65. — Uncinus from somite XXV, X 360. 

 Sabellaria calif ornica — figs. 66a and b. 



Fig. 66a. — Palea of middle series of operculum, X 33. 



Fig. 666. — Same of inner series X 33. 



