LEODICID^E OF THE WEST INDIAN KEGION. 



23 



The gills appear as a single filament on the twenty-seventh somite ; on the fiftieth 

 this had increased to two, and in the region of the ninetieth there are three with an 

 occasional small extra branch. The gills continue to the extreme posterior end of the 

 body, though the number of filaments is reduced to one. At the very posterior end 

 (plate 3, figure 4) the filament is much smaller than the dorsal cirrus. Through the 

 middle of the body, where the number of filaments is greatest, they are very long and 

 slender and form a dense fringe along the sides of the body. 



The first parapodium (text-figure 41) has a very small setal lobe, with nearly equal 

 lips and very prominent cirri, the dorsal one much longer and relatively more slender 



TEXT-FIGURES 41 to 53. Leodice denticulata Webster. 



41. First parapodium x22. 



42. Tenth parapodium x22. 



43. Ninety-seventh parapodium x22. 



44. Twenty-fifth parapodium in front of pygidium x22. 



45. Seta from first parapodium x370. 



46. Second form of seta from first parapodium x760. 



47. Seta from ninety-seventh parapodium x460. 



48. Pectinate seta from tenth parapodium x850. 



49. Dorsal acicula from ninety-seventh parapodium x370. 



50. Ventral acicula from last parapodium x370. 



51. Maxilla xlO. 



52. Mandible xll. 



53. Portion of tube xl. 



