72 



LEODICID/E OF THE WEST INDIAN REGION. 



minal teeth longer than the others. In the gilled somites a second form appears and 

 in this region is more numerous than the first. These (text-figure 252) are flatter than 

 the others and have about 12 equal-sized, very large teeth. The aciculse throughout 

 the anterior portion of the body and those situated dorsally in the parapodium farther 

 back are very black in color with bluntly rounded ends, the extreme tip covered with a 

 colorless layer (text-figure 253). The ventral acicula, which appears in posterior 

 somites (text-figure 254), is much more slender, is widened a little toward the tip, and has 

 terminal and subterminal teeth covered by a delicate hood. It is colorless at the apex, 

 but the greater part of its shaft is a light brown. 



The maxilla (text-figure 255) is very dark in color. The carrier is extremely short, 

 the forceps long and heavy. The proximal paired plates have each 4 teeth, though 



247 



TEXT-FIGURES 245 to 256. Marphysa nobilis Treadwell. 



245. First parapodium ' x34. 



246. Tenth parapodium x34. 



247. One-hundred and fiftieth parapodium x!8. 



248. Posterior parapodium x31. 



249. Simple seta x310. 



250. Compound seta x310. 



251. Pectinate seta of anterior region x310. 



252. Pectinate seta of posterior region x310. 



253. Apex of acicula x310. 



254. Acicula from posterior end x310. 



255. Maxilla x8. 



256. Mandible x8. 



