Annelida Ch^etopoda of New Jersey. 125 



(fig. 58), of which two are very small ; along the inner two-thirds are numerous 

 longitudinal striae, interrupted by transverse striae, unequally distant from each 

 other ; at the fourth setigerous segment the number of uncini increases suddenly 

 to ten or fifteen in each series, and the form also changes (fig 59) ; they have 

 now five terminal teeth, a short, external part is quite narrow, and divided from 

 the stouter, internal part by a deep constriction, simulating a compound seta ; 

 the thirty-seventh segment has only the dorsal setae ; to the tenth segment the 

 setae are found in the middle of each segment ; after the tenth they suddenly 

 recede to near the posterior end. 



Three specimens were collected — one perfect, the others with anterior part only ; 

 and of these only one, having the ten anterior segments, was observed while 

 living; its general color was yellowish- white, with narrow, red bands on the 

 posterior part of each segment after the fourth, increasing gradually in width so 

 as to occupy one-half the length of the tenth segment ; indications of similar bands 

 can be traced on the entire specimen, in alcohol, but not after the tenth segment. 



Length of entire specimen, 95 mm ; greatest diameter, 3 mm ; diameter of buccal 

 segment, 2 mm . 



Number of segments, 39 ; buccal (coalesced with the cephalic), 1 ; setigerous, 

 36; ante-anal, nude, 1; anal, 1. 



Rare ; found in sand at low water, associated with Clymenella torquata 

 Verrill. 



Praxilla elongata var. Benedicti Webs. 



PLATE VI, FIGS. 60, 61. 



Mr. J. E. Benedict found at south Norwalk, Conn., a variety of this species, 

 differing from the form just described in the following particulars : 



First two segments short (fig. 60), together about equal to the third ; after 

 the fifteenth segment the diameter suddenly becomes less, segments short, and, 

 except the last four, equal. (Compare the first segment of fig. 61 with the first 

 of fig. 56.) The ante-anal segments (fig. 61), quite short, together equal to the 

 anal ; anal cirri longer than in the New Jersey form. 



Length of an entire specimen, 20 mm ; number of segments, 37. 



A young specimen had twenty-six segments, with a length of 3™ m . 



PARAXIOTHEA a. gen. 

 No cephalic plate. 



Anterior margin of first segment prolonged as a thin membrane, emarginate 

 above, and with a slightly projecting conical process in the middle line below. 



Mouth situated on the lower surface of a conical process, arising from the 

 bottom of the cylindrical cavity enclosed by the frontal membrane, not reaching 

 to the front margin of the membrane. First segment with capillary and un- 

 cinate setae, similar to those on the remaining segments. 



Anal segment funnel-shaped ; margin digitate. 



Paraxiothea latens n. sp. 



PLATE VII, FIGS. 62-66. 



Frontal membrane (figs. 62, 63) forming one-half the length of the first seg- 

 ment ; anterior margin slightly reflexed, lobed or scolloped by shallow incisions, 



