LEODICID.E OF THE. WEST INDIAN REGION. 89 



Lysidice sulcata Treadwell. 



(Plate 4, figures 13 to 15; text-figures 314 to 323.) 



Lysidice sulcata Treadwell, 1901, p. 200, figures 47, 47a, 48. 



Lysidice brachycera(?) Schmarda, 1861, p. 121, plate xxxii, figure 255. 



A larger species than L. notata, though this would not so appear from the drawings. 

 (Compare figure 1, plate 8, and figure 13, plate 4.) L. sulcata was drawn from a small 

 specimen and on a smaller scale than L. notata. An average specimen measures about 

 125 mm. in length with a head-width of 3 mm., and contains something over 300 somites. 

 In a footnote in the above paper I suggested that this might be the same as Verrill's 

 L. bilobata, but this suggestion proves to be erroneous, that species being evidently 

 synonymous with L. notata (see p. 86). In alcohol the two are not easy to distinguish, 

 though the reddish color of L. sulcata often persists after preservation. It is usually 

 stouter than sulcata and the head is flatter. 



The prostomium (plate 4, figures 13 and 14) is colorless or very lightly tinged with 

 pink, and is wider than the peristomium. The tentacles are shorter than the prosto- 

 mium. (The contrary appearance shown in figures 13 and 14 is because the prostomium 

 had been bent ventrally.) The tentacles are red through the greater part of their 

 length, leaving the base and apex colorless. One pair of dark-brown eyes. There is 

 a clearly marked, but not deep, indentation of the anterior edge of the prostomium. 



The peristomium is a brilliant red marked with numerous yellow spots, and this 

 coloration is continued through about the anterior third of the body, gradually fading to a 

 yellowish brown. This body-color may also be much modified by the color of the sexual 

 products. 



The peristomium is about as long as the two following somites, while later ones 

 become shorter (plate 4, figure 14). Their actual appearance depends on the degree of 

 contraction, for the preserved animals often show much longitudinal contraction in the 

 anterior third. The posterior half of the body shows a gradual narrowing. There are 

 two pairs of anal cirri (plate 4, figure 15), one pair much larger than the other. The 

 dorsal cirri are larger in anterior than in later somites. 



The first parapodium (text-figure 314) has a slender dorsal cirrus, a much heavier 

 ventral cirrus, and a setal lobe with anterior and posterior lips. The tenth (text-figure 

 315) has a slender dorsal cirrus and a small ventral one, borne on the end of a swollen 

 base; also a rounded post-setal lobe. These anterior parapodia have a single acicula 

 with a smooth tip. Later parapodia (text-figure 316) show a very great reduction in the 

 size of the dorsal cirrus, but the ventral cirrus remains about as before. The post-setal 

 lobe becomes pointed. In these there is one, or sometimes there may be two, ventral 

 aciculse, each with toothed apex. 



The compound setse (text-figure 317) have more slender terminal joints than in 

 L. notata and the basal joints are not so noticeably widened. Toward the posterior end 

 of the body the basal joints become much elongated, so that the seta tufts are very promi- 

 nent throughout all this region. The pectinate setse (text-figure 318) have very slender 

 stalks and 20 or more very delicate teeth. The simple seta (text-figure 319) is long 

 and slender, expanded very slightly toward the apex, and narrowing beyond this to an 

 acute tip. On either side there is a row of very obscure denticulations. The dorsal 

 acicula (text-figure 320) is rounded, the whole acicula being very dark except at the 

 extreme tip. The ventral acicula (text-figure 321) has a bluntly rounded lateral tooth 

 near the apex, and the whole covered by a hood. This is also very dark in color except 

 at the extreme end. 



In its general appearance the maxilla resembles very closely that of L. notata, the 

 most easily recognized distinction being the shorter carrier. The carrier (text-figure 322) 



