70 



LEODICID^ OF THE WEST INDIAN REGION. 



The maxilla (text-figure 244) is very dark-colored, with short carriers and heavy- 

 forceps curved upward at the ends. The proximal paired plates have each 5 teeth, the 

 unpaired has 6, the right distal paired has 9, the left has 3. There are dark pigment 

 patches distal to the plates and lighter colored accessory plates on the sides. The mandi- 

 ble (text-figure 242) has very narrow shafts and a small beveled portion covered with a 

 whitish incrustation, which is continued forward as a colorless plate. 



The specimens of M. brevitentaculata were collected in sand on a beach near Scar- 

 borough, in Tobago, in April 1918. They seemed fairly common in the sand, but were 

 extremely diflScult to collect entire, apparently on account of the depth of the burrows 

 and the rapidity with which they crawl head first down them. 



Type in the American Museum of Natural History. 



243 



Text-figures 235 to 244. Marphysa brevitenlaeulata Treadwell. 



235. First parapodium x55. 



236. Tenth parapodium x20. 



237. Parapodium from region of the fiftieth x34. 



23S. Parapodium from region of the six-hundredth x34. 

 239. Simple seta x380. 



240. Compound seta from anterior end x380. 



241. Pectinate seta x380. 



242. Mandible x20. 



243. Acicula from sixtieth parapodium x200. 



244. Maxilla x20. 



