LEODICID^ OF THE WEST INDIAN REGION. 



85 



Genus LYSIDICE Savigny. 

 J. C. Savigny, Systems des Anne'lides, etc., 1820, p. 13. 



Prostomium rounded, with three tentacles. No nuchal cirri or gills. The jaw 

 apparatus of maxilla and mandible, the former with carrier, forceps, and paired and 

 unpaired plates resembling Leodice. The mandible like that found in Leodice, but usually 

 very large as compared with the maxilla. Animals belonging to this genus are generally 

 of small size. 



Lysidice tortugse, new species. 



(Text-figures 298 to 304.) 



A very long, slender form, found in a sponge, dredged at the Dry Tortugas in 1915. 

 One animal was occupying a tube exactly like that of Leodice denticulata, but since the 

 tube seemed much too large for its occupant, I think that it probably belonged to the 

 latter species. Parts of only two individuals were found. 



In general appearance the animal is much like Drilonereis attenuata (see p. 107), 

 and was at first mistaken for that species. The peristomial width was about 0.5 mm., 

 but at its widest part, where it was distended with sex products, it measured as much 

 as 1 mm. There were several hundred somites. The body narrows gradually toward 

 the posterior end and there are two pairs of unequal anal cirri. 



The prostomium (text-figure 298) is noticeably bilobed and relatively very large. 

 The slender tentacles extend to beyond its margin, and a large, dark-brown eye is 

 situated just outside the base of each lateral tentacle. The peristomium is very short 



300 



TEXT-FIGURES 298 to 304. Lysidice tortugce Treadwell. 



298 

 299 

 300, 

 301. 



Head x28. 



Maxilla xl!4. 



Mandible x92. 



Second parapodium x200. 



302. Compound seta x666. 



303. Simple seta x666. 



304. Middle parapodium x!42. 



