52 LEODICID^ OF THE WEST INDIAN REGION. 



as in the first, and the arrangement of aciculse is much as it is in that somite. The 

 one-hundredth parapodium (text-figure 156) has a rounded posterior lobe (which in the 

 figure conceals the anterior one) and two aciculse, the dorsal one being straight and sim- 

 ple at the end, while the ventral one is bifid at the end (text-figure 157). The ventral 

 cirrus is still a small lobe at the end of a pad, while the dorsal is slender and straight, 

 about as long as the slender gill which rises from its base. Text-figure 158 is the fiftieth 

 parapodium from the posterior end, and shows that the setal portion becomes pointed, 

 with a brown acicula extending into its apex, with a dorsal cirrus slightly more slender 

 than anteriorly and a ventral cirrus slender and elongated. The gills in this somite are 

 more prominent than the dorsal cirrus. Needle aciculse extend into the dorsal cirrus in 

 all somites, and in many, instead of a single ventral acicula, there are four or five in the 

 setal lobe. 



The gills begin at a point between the eightieth and ninetieth somites as a single 

 filament. Later, other filaments are added (text-figures 156 and 158), but I have never 

 found more than five on any gill. They are never very prominent, but extend to within 

 a very few somites of the posterior end and retain the branched condition throughout. 

 The blood-vessels form a loop in each filament. 



The maxilla was dark in the specimen figured, though in another it was much lighter 

 colored (text-figure 159). The carrier is relatively very short, with its winged margins 

 rounded and very dark-colored. The forceps has long basal portions, the terminal 

 portions slender and not much curved. The proximal plates have 7 teeth on the left and 

 5 on the right ; the right distal paired plate has 6 teeth, the left has 1 large and 2 smaller 

 ones; the unpaired has 7. There are two small flat plates on either side, and the usual 

 crescent-shaped patches distally. The mandible is very delicate and difficult to remove 

 without injury. Each half is slender, light-straw in color, with longitudinal markings 

 of darker brown, and the terminal beveled portion is only faintly marked off from the 

 basal. This terminal portion has very faint concentric lines not easily seen. There is 

 a triangular wing on either side, with a band of irregular dark-brown spots marking the 

 line of separation of the main portion and the wing (text-figure 160). 



Anteriorly the compound setse make up a dense tuft in each parapodium, the simple 

 setse being very inconspicuous. It is probable that pectinate setse occur throughout the 

 body, though I was unable to demonstrate them in all cases. Posteriorly these pecti- 

 nate setse are the most prominent of any, having very long shafts which extend far 

 beyond the setal portion, whils the other forms are very few in number and are often 

 broken. The dorsal acicula (text-figures 154-158) is straight or slightly bent, bluntly 

 rounded at the end, and varies in density of coloring in different parapodia. The ventral 

 acicula (text-figure 157) is lighter in color, broadened and bent at the end, with a very 

 small terminal and much larger subterminal tooth. The compound setse have thick 

 basal portions which are striated at the end (text-figure 161), and short and rather thick 

 terminal joints, the latter with teeth much like those of the ventral acicula. These 

 setse are of essentially the same size as the acicula and in appearance differ from it mainly 

 in the possession of the joint. The simple setse (text-figure 162) are very long and 

 slender, slightly widened and curved toward the end, but without wings or denticula- 

 tions. The pectinate setae (text-figure 163) are unusually small and in posterior somites 

 are carried on a very long stalk. Each has 8 or 9 teeth. 



Type in the American Museum of Natural History. 



Leodice notata, new species. 



(Plate 4, figure 12; text-figures 164 to 173.) 



A rather small species, one specimen, not the largest of the collection, measured 

 40 mm. in length, with a prostomial width of less than 1 mm., and was composed of about 



