154 [Assembly 



Maldane elongata Verrill. 



VERRrLL. Invert. Animals of Vineyard Sound, etc., p. 609. 1874. 

 Webster. Annel. Clijet. of the Virginian Coast, p. 259. 1879. 



Rare ; only oue specimen was taken. 



PRAXILLA Malmgren. 



Nordiska Hafs-Annulater, \). 191. 1865. 



In cbaracterizing the genus Pkaxilla Malmgren assigns to it 

 twenty-six segments, of which nineteen are setigerous, and five ante- 

 anal without setae. The following species belongs to Praxilla in all 

 other respects, but has more than twenty-six segments, and less than 

 five nude ante-anal segments. 



Pkaxilla elongata n. sj). 



PLATE (VI), IX, FIGS. 55-59. 



Buccal segment (fig. 55) with a projecting margin, slightly emar- 

 ginate in the middle line above, and with a very narrow, hardly 

 perceptible incision on each side, a little back of the middle. The 

 cephalic plate has a well-defined, median carina, widest in front, and 

 with a battened, slightly projecting portion, broadly rounded at the 

 apex. 



After the fifth segment the diameter increases gradually to the 

 tenth ; remains unchanged to the thirteenth ; decreases gradually to 

 the sixteenth ; then falls off suddenly to about one-half the previous 

 diameter, after which it remains unchanged. 



Segments one, two, four, five and six have about the same length ; 

 three, seven, eight and nine are a little longer than the preceding ; 

 ten to fifteen about double the ninth ; sixteen to thirty-six a little 

 shorter than the fifteenth ; last three equal to each other — together 

 equal to the thirty-sixth (fig. 56). 



The anterior margin of the fifth segment is raised and rounded, 

 embracing the posterior end of the fourth. * The first fifteen seg- 

 ments are nearly cylindrical, segmentation distinct, and crossed by 

 numerous impressed lines; after the fifteenth the form suddenly 

 changes, the anterior end being narrow, diameter increasing regu- 

 larly to near the posterior end, then somewhat suddenly decreasing; 

 the posterior margin of the ante-anal segment is raised, rounded, 

 forming a sheath for the anterior end of the anal segment. 



The anal segment is funnel-shaped ; margin surrounded by a 

 circle of conical or finger-shaped papillfie ; very similar to the anal 

 segment of Clymenella torquata Yerbill. 



Setae; dorsal (capillary) numerous, long, delicate, bilimbate (fig. 

 57) ; after the fifth segment there is a distinct, rounded papilla, or 

 dorsal ramus, from which the setae arise ; ventral (uncini), on the 

 first three setigerous segments only one, or occasionally two, to each 

 ramus; these end in three sharp teeth (fig. 58), of which two are 

 very small; along the inner two-thirds are numerous longitudinal 



