[9] ANNELIDS OF PKOVINGETOWN, MASS. 707 



On our specimeus there were no setae in the dorsal rami ; as they were 

 not in good condition, it seems i)robable that these setse had been lost^ 

 as is often the case in Podarlce ohscura. The ventral setae have the 

 usual form ; one in eacli bundle is very long, both in stem and appendix, 

 those above and below it proportionately shorter as they are more re- 

 mote j from 4 to 8 in each bundle. 



The general color is yellowish white, crossed above and below by 

 many transverse bands, made up of irregularly shaped, yellowish- 

 brown spots and specks. 



Width, without feet, at ninth segment, 2""™. 



Length of first 10 segments, lO™'". 



No entire specimen was found. 



Low water; sand. 



HESIOKE [Savigny) Quartrefages. 



HESIONE AGILIS 71. sp. 



(PL. I, Figs. 9-11.) 



The head of this species is very peculiar (fig. 6); anterior margin 

 with a slight median convexity, otherwise straight; outer angles very 

 broadly rounded; lateral margins concave; posterior margin very con- 

 cave; posterior angles prolonged far backward, forming wide, obtusely 

 rounded lappets. 



The length of the head along the middle line is one-third the width 

 of its anterior part, while the distance from the anterior to the poste- 

 rior lateral angles is a little more than two-thirds the same length. 



The posterior antennse arise from rounded projections (basal articles), 

 halfway between the eyes and anterior margin of the head; they are 

 conical, a little swollen at base, in length about double the length of 

 the head along the line on which they stand; the anterior antennae arise 

 from the front margin of the head in front of and a trifle within the 

 posterior antennae; they have stout cylindrical basal articles, are con- 

 ical, a little longer than the posterior pair. 



There are two pairs of eyes, lateral; bright red; anterior pair oval, 

 oblique, large; i3osterior pair a little within the anterior, in contact with 

 them, more or less regularlj^ crescentic. 



The tentacular cirri have the form shown in the figure, but their length, 

 was not even approximately the same on any two specimens. The long- 

 est one figured would reach about to the fourth segment, but in some 

 specimens one of the cirri reaches to the eigilith or even to the tenth 

 segment. Out of half a dozen specimens taken we could determine no 

 law for the relative length of the cirri; nor could we even say whether, 

 as a rule, the upper were longer or shorter than the lower. 



It would seem that they are normally very long, from two to four 

 times as long as figured, but readily lost and renewed. They have long 



