LEODICID^E OF THE WEST INDIAN REGION. 



35 



as the seventh somite. They are all jointed, the median with about 13 joints, the inner 

 paired with 12, and the outer paired with 6. In addition to the true joints, surface 

 wrinklings simulate articulations. The basal joints are the longest, the terminal ones 

 becoming almost moniliform. The tentacles are all very delicate in appearance and are 

 colorless or with a very faint suggestion of pink. 



The peristomium is hardly broader than the second somite (plate 1, figure 18). The 

 nuchal cirri extend beyond the anterior border of the peristomium and have 7 or 8 joints. 



The first parapodium (text-figure 85) has prominent cirri, the dorsal being about 

 three times as long as the ventral. The setal lobe has a cirrus-like apex into which the 

 acicula extends and there are needle aciculse in the dorsal cirrus. The tenth parapodium 

 (text-figure 86) has a very long and slender dorsal cirrus, the ventral cirrus a short 

 process on the end of a swelling. The end of the setal lobe is drawn out into two proc- 

 esses, but the aciculse do not extend into them. There are a few small needle aciculse. 

 A posterior parapodium (text-figure 87, region of the sixtieth) also has slender cirri, a 

 rounded anterior and posterior lip, very similar in form, and an elongated conical setal 

 lobe, into which the aciculse extend. There is a ventral acicula, but I could find no needle 

 forms in the dorsal cirrus. The dorsal cirri are often wrinkled and simulate articulations, 

 but true articulation does not appear. There are two pairs of very delicate anal cirri, 

 one pair very much larger than the other. 



The simple setse (text-figure 88) are very delicate, sharp-pointed structures. In 

 some, as in the one figured, there is a narrow marginal wing, but I could not find it in 



85 



TEXT-FIGURES 85 to 94. Leodice rubrivittata Treadwell. 



85. First parapodium x!60. 89. Compound seta x!20. 92. Ventral acicula x!20. 



86. Tenth parapodium x80. 90. Pectinate seta x!20. 93. Maxilla x32. 



87. Posterior parapodium x80. 91. Dorsal acicula x!20. 94. Mandible x32. 



88. Simple seta. x!20 



