viii List of Text-figures 



PAGE 



Fig. 23. A. glacialis. Crotchets, in three phases of growth ... 52 



Fig. 24. A. pusilla. Crotchets from the type specimen, and from 



specimens 17 and 160 mm. long . . . . . .53 



Fig. 25. A. cristata. First crotchet of a larva "25 mm. long . . 53 



Fig. 26. Crotchets from specimens 48, 130, 250 and 



330 mm. long 54 



Fig. 27. A. loveni. Crotchet from the type specimen, and from a 



specimen from Saldanha Bay ...... 56 



Fig. 28. A. ccaudata. Crotchet from a post-larval specimen, 8 mm. long 56 



Fig. 29. ,, Dorsal and ventral crotchets of a neuropodium 



from a specimen 200 mm. long ...... 57 



Fig. 30. A. branchialis. Crotchet from a specimen 230 mm. long . 57 



Fig. 31. A. marina (from Wood's Holl). Dorsal axis of gill . . 59 

 Fig. 32. A. pusilla (from Unalaska). Dorsal axis of gill . . .59 



Figs. 33, 34. A. glacialis. Gills .60 



Fig. 35. J. branchialis. Gill 61 



Fig. 36. A. ecaudata. Dorsal gill-stem ...... 61 



Fig. 37. A. marina. Statoliths, and cuticular lining of statocysts of 



specimens from Jersey and Trieste ..... 68 



Fig. 38. A. assimilis var. affinis. Statoliths, and cuticular lining of 

 statocysts of specimens from Otago Harbour and the Falkland 



Islands ....,..".... 68 



Fig. 39. A. glacialis. Statoliths, and cuticular lining of statocyst . 69 



Fig. 40. A. cristata. Statolith, and cuticular lining of statocyst . . 70 



Fig. 41. A. branchialis. Statoliths, and cuticular lining of statocyst . 70 



Fig. 42. A. marina. Ripe spermatozoon and ripe ovum ; A. bran- 

 chialis, ripe ovum .... ... 72 



Fig. 43. A. loveni. Anterior end, dorsal aspect . . ,. . . 103 



Fig. 44. ,, Type specimen ; a portion of the nineteenth 



chaetiferous segment, the extra (twentieth) segment and 



notopodium, and a portion of the tail . . . . 104 



Fig. 45. A. cristata. Anterior end, dorsal aspect .... 106 



Fig. 46. A. glacialis. Anterior end, dorsal aspeet . 112 



Fig. 47. ,, Diagram of a dissection of the anterior portion . 113 



Fig. 48. A. pusilla. Anterior end, dorsal aspect . . . . . 116 



Fig. 49. ,, Anterior aspect ........ 116 



Fig. 50. ,, Type specimen, right aspect of tenth chaetiferous 



segment . . . . . . - 117 



Figs. 51, 52. A. pusilla. Type specimen, antero- ventral and dorsal views 



of the anterior end . v . US' 



Figs. 53, 54. A pusilla. Specimen from California, antero-ventral and 



dorsal views of anterior end . ... 118 



