88 LEODICID^E OF THE WEST INDIAN REGION. 



ventral cirrus. The dorsal cirrus is also much smaller than in the anterior somites. 

 The anterior parapodia have each a single acicula, to which in the later somites is added 

 a more ventrally placed bifid one. 



The setae are alike throughout the body, varying in number in different regions and 

 being especially prominent in the posterior somites. This prominence is mainly due to 

 the relatively great length of the simple setse, though the basal joint of the compound 

 setae are very long in this region. The compound seta? (text-figure 313) have the basal 

 joints much expanded and denticulated at the apices, the terminal joints with apical 

 and subapical teeth, though without any very definite basal tooth as described by 

 Verrill (1900, p. 645). The pectinate setae (text-figure 309) have about 13 teeth, though 

 this number is not constant, the one drawn having 16. On account of their refractility, 

 the structure of these teeth is hard to make out. Verrill describes his specimens from 

 Bermuda as having about 10 teeth. The simple seta (text-figure 308) is elongated, 

 flattened, and curved toward the apex, with numerous denticulations along one edge. 

 The dorsal acicula in all somites has a simple apex, while the ventral one, which occurs 

 only toward the posterior end, is bifid, with the subapical tooth larger than the terminal 

 one and extending nearly at right angles to the shaft (text-figure 310). 



The maxilla (text-figure 311) has a carrier nearly as long as the forceps, the latter 

 being heavy and noticeably curved. These are brown at the base, but become very 

 dark toward the apex, though this latter is covered with a whitish incrustation. The 

 proximal paired plates are colored much like the forceps, and each has 4 prominent 

 teeth. The distal paired plates have 2 teeth on the left and 5 on the right. The 

 unpaired has 3 teeth. There are 2 small accessory plates on either side of the distal paired 

 and a small pigment patch in front of each. The mandible (text-figure 312) is much 

 larger than the maxilla, mostly colorless, but with a median darker area which may 

 become very dark, and on the dorsal lateral surface (the surface turned toward the max- 

 illae) each has a prominent longitudinal black band, which is easily seen in the entire 

 animal and which much resembles a similar band found in L. sulcata. 



Except for points noted above, the specimens from the Tortugas agreed with Ver- 

 rill's description of the Bermuda animals. In an earlier paper (Treadwell, 1901, p. 200, 

 footnote) I suggested that this might be synonymous with Lysidice sulcata, which I 

 described from Porto Rico. I have since compared the type of L. sulcata with these 

 specimens and find that the two are decidedly different, some points of difference being 

 indicated in my present description of L. sulcata. 



The breeding season for this species at the Tortugas apparently begins about the 

 first of July, for while I got no fertilized eggs, females with apparently mature eggs were 

 found July 1, 1914. 



Lysidice notata is rather rare in the Tortugas, especially as compared with Nicidion 

 kinbergii, with which it is usually rather closely associated. More were found in the 

 mud at Mangrove Key in Key West Harbor, and a few were collected in Bermuda in 

 1916 at Marshall Island. Ehlers's specimens were collected off Tortugas in 18 fathoms 

 and in 310 fathoms at latitude 23 03' N., longitude 93 10' 5" W. Verrill gave no local- 

 ity except Bermuda for his L. bilobata. Specimens in the U. S. National Museum were 

 collected at latitude 28 45' N., longitude 85 02' W., in 30 fathoms, and I found the 

 species in Montego Bay, Jamaica. 



