114 



LEODICIDyE OF THE WEST INDIAN REGION. 



vary in width, the one figured being one 

 of the narrowest. 



The maxilla (text-figure 423) has very 

 long basal stalks, tapering to sharp points 

 at the ends. Only about two-thirds of 

 their length is represented in the figure. 

 The halves of the forceps are unlike in 

 form, but both are rather heavy and both 

 have basal denticulations. The proximal 

 paired plates are also unlike; the right 

 one is much the larger and has 9 teeth, 

 the terminal portion being so curved that 

 it hooks over the terminal part of the 

 forceps. The left plate has 6 teeth and is 

 also hooked over the end of the corre- 

 sponding forcep. The second and third 

 paired plates are concave, the terminal 

 tooth being the largest and lying at a 

 higher level than the others. There are 

 7 unequal teeth on the right and 4 on the 

 left in the second pair, while the third 

 has 5 on the right and 4 on the left. 

 The fourth pair of plates have each 1 

 tooth. The mandible (text-figure 424) 

 is rather heavy, the two halves joined 

 for about one-half their length and with 

 short basal stalks. 



Collected in Petit Trou Lagoon and 

 in Buccoo Bay, Tobago, and in Montego 

 Bay, Jamaica. 



Type in the American Museum of 

 Natural History. 



422 



423 



TEXT-FIGURES 421 to 424. 

 Arabella setosa Treadwell. 



421. Parapodium x80. 



422. Seta x210. 



423. Maxilla x30 (terminal third of shaft not figured). 



424. Mandible x30. 



Arabella maculosa Verrill. 



(Plate 9, figures 12 and 13; text-figures 425 to 428.) 

 Arabella maculosa Verrill, 1900, p. 651. 



Verrill's type specimen, now in the Yale Museum, is 95 mm. long, but the posterior 

 end seems to be regenerating. There are 162 somites in front of the regenerating por- 

 tion. Most of the body is colorless (in alcohol), but in the middle region there is a 

 transverse purplish brown band in the middle of each somite. The head is blunt sugar- 

 loaf in shape, and the eyes are very indistinct, though agreeing in general with Verrill's 

 description. 



One specimen, collected by dredging in the Northwest Channel at the Dry Tortugas 

 in 1914, agreed in general with Verrill's description of the color characters. The head 

 was a prominent sugar-loaf in form, very iridescent, and with four eyes, the outer pair 

 larger and slightly posterior to the inner. Verrill describes their relative positions as 

 the reverse of this, and others that I found agreed with his description. Apparently there 

 is some variation in this respect. The peristomium is about half as long as the pro- 

 stomium and has a row of green spots on either side. There is a larger green spot on 

 its dorsal surface, overlapping onto somite 2. Somite 2 is a little shorter than somite 1, 



