126 



LEODICID^E OF THE WEST INDIAN REGION. 



The tenth parapodium (text-figure 461) has a setal lobe shaped much like the first, 

 and a rounded posterior lip, a little longer than the setigerous lobe. The dorsal cirrus is 

 long and articulated, the basal joint longer than the setal lobe, the second joint more 

 slender and about half as long as this, the terminal joint about as long as the basal, but 

 very slender and acute at the apex. The ventral cirrus is much smaller than on the first 

 parapodium. Later parapodia agree in general with this in structure, the chief difference 

 being in the setal lobe, which becomes very long and slender. There is one large acicula 

 in the setal portion and a single smaller one extends into the dorsal cirrus. 



In all parapodia there are two tufts of setae, the dorsal simple, the ventral compound 

 ones. The simple setse (text-figure 462) are very slender and toothed for a certain dis- 

 tance along one edge. Some seemed to be narrower and more curved than others, but 

 no other differences appeared. The broader ones showed a very faint indication of a 

 terminal notching into minute teeth, as in figure 462. The compound ones are very 

 small, and there are two varieties; one (text-figure 463) has a rather heavy basal portion 

 and a short and thick terminal joint, strongly bidentate at the apex and covered with a 

 small hood; another has the shaft and terminal portions both more slender than this, the 

 terminal portion being more than twice as long, relative to its transverse axis, as is the 

 case with the one figured. They agreed in having a bidentate apex. The slender forms 

 are more numerous in the tuft than the stout ones. 



The maxillary apparatus has the V-shaped form found in this genus. I was unable 

 to secure a drawing of the entire apparatus and figure only fragments. At the base 

 (text-figure 464) is a stout plate united by a narrow neck with its fellow of the other 

 side. On the inner margin of this plate, about half-way of its length, are several strong 

 teeth. Lateral to it, near its apex, are small plates, each toothed at its inner end. 

 Beyond this plate are two rows of plates, one row continuous with the teeth of the basal 

 plate, the other continuous with the small plates shown in figure 464. Figure 465 shows 

 the entire structure of the first pair of these plates. The inner ones are the larger, each 

 with a heavy terminal tooth, a single large tooth on its distal margin, and a row of 



465 464 466 



TEXT-FIGURES 459 to 467. 



459. Anterior end drawn from preserved material x7. 



460. First parapodium x90. 



461. Tenth parapodium x60. 



462. Simple seta x334. 



463. Compound seta x334. 



464. Basal portion of one-half of maxilla x90. 



462 



Stauronereis melanops Verrill. 



465. Middle teeth of maxilla, inner ones on left, outer 



ones on right x90. 



466. Distal teeth of maxilla, inner ones below outer ones 



above x90. 



467. Mandible x90. 



