448 



PROCEEDINGS OF THE ACADEMY OF 



[Nov, 



DESCRIPTION OF A NEW SPECIES OF ANNELID FEOM WOODS HOLE. 



; BY J. PERCY MOORE, 

 Syllides verrilli n. sp. 



Form moderately slender, slightly flattened and wider in the middle 

 region. Size small, length 2.5-3 mm., maximum width .2-.3 mm. 



Prostomium large (fig. 1, a), depressed, slightly wider than long, 

 broadly elliptical or subquadrate with rounded corners, often slightly 

 emarginate anteriorly and nearly straight posteriorly. Eyes three 

 pairs, reddish brown; the first pair minute and situated well in advance 

 of the others just behind and external to the base of the lateral antennae; 

 the second and third pairs much larger, subequal, their diameter about 

 ^ the wddth of the prostomium, both on posterior half of prostomium ; 

 the middle pair widest apart and separated by about 5 times their 

 diameter, the posterior pair slightly behind and mediad of them near 

 the posterior margin of the prostomium. 



Fig. 1. — Syllides verrilli. a, dorsal view of head with protruded proboscis; b, 

 ventral view of prostomium and 3 segments, showing palps; c, pvgidium 

 with caudal cirri, all X S3. Fig. b from No. 2402, all others from No. 2401. 



Palpi (fig. 1, h) very small, mammilliform, situated on the ventral 

 face of the prostomium and directed downwards, invisible or nearly so 

 from above. They consist of swollen bases and short cirriform distal 

 ]iortions which alone ever appear in dorsal views. Tentacles (fig. 1, a) 

 all short, stoutly clavate; the middle one arising on a line joining the 

 anterior borders of the middle pair of eyes, their length equaling or 

 slightly exceeding the prostomial width, their ends bluntly rounded 

 and about twice as thick as the base. Lateral tentacles arise close to 

 anterior border of prostomium, their bases separated by a distance 



