No. 104.] 153 



long (fig. 51), but few in the dorsal rami, from eight to twelve in 

 the ventral ; thej grow progressively shorter backward (figs. 52, 53), 

 and along the posterior third their number is much reduced, there 

 being one to three in the dorsal rami, three to five in the ventral ; 

 a few of the posterior segments may be without sette. The form of 

 the uncini changes, as shown in the figures. 



The anterior segments are biannulate, afterward crossed by from 

 three to five deeply impressed lines. 



The anal segment is obliquely truncated ; margin thickened and 

 rounded (fig. 54) ; from its lower border projects a finger-shaped 

 cirrus, which is distinctly annulated. (A similar cirrus exists on 

 N. lurldus Yerr., Ancistria viinima Quatr., and on several as 

 yet unpublished species from Beaufort, N. C. I do not know that 

 this cirrus has been previously described as belonging to this genus, 

 or to any in the family.) 



Color : red to purplish-red in front ; flesh-color to bright red 

 behind. 



Length very variable ; greatest diameter of largest specimen 1.2°^°^. 



Common ; low water to fifteen feet. 



NoTOMASTUs LURiDus YerrilL ■ 

 Invert. An. of. Yin. Sound, etc., p. 610. 1874. 

 Rare ; only one specimen was taken. 



Young forms of Notomastus ? 



{a). One specimen, evidently immature, had capillary set!© only 

 on tlie first four segments, theu uncini only ; but about the middle 

 of the body the dorsal uncini were replaced by capillary setse. Pos- 

 terior segments lost. 



(b). Another form, of which several specimens were found, had 

 capillary setae in all the dorsal rami, uncini in all the ventral. 

 Length of (a) and (b) 10-20'^^°. 



Found in shells bored by sponge ; low water to fifteen feet. 



Fam. MALDANID^E. 



CLYMENELLA VerriU. 

 Invert. Animals of Vineyard Sound, p. 607. 1874. 



Clymenella torquata Verrill. 



Clymene torquata Leidy. Marine Invert. Fauna R. I. and N. J., p. 14. 1855. 

 Clymenella torquata Vekrill. Op. Cit., p. 608, pi. xiv, figs. 71-73. 1874. 



" " NVebster. Annel. Chfet. of the Vir. Coast, p. 258. 1879. 



Very common in sand at low water. 



MALDANE {Grube) Malmgren. 



Grube. Archiv fiir Naturgcschiclite. 1860. 

 Malmgren. Nordiska Hafs-Aunulater, p. 186. 1865. 



[Assem. Doc. No. 104.] 20 



