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NEW YORK STATE MUSEUM 



body with a broad, fuscous stripe along the median line. Comb 

 consisting of about seven simple, conical teeth attached to the 

 posterior border of a lateral plate. Air tube about three times as 



Fig. 81 Pecten teeth of U. 

 A apical, B basal 



sapphirina 



long as wide, subcylindric, somewhat curved, and with a pair of 

 apical valves, each about as long as one half the width of the tube. 

 Pecten extend nearly to the basal half of the air tube, where 



there is a conspicuous pair of com- 

 pound hairs, composed of about 13 

 teeth, which are unique on account 

 of the nearly conical portion bearing 

 a lateral and apical, semitransparent, 

 serrate fringe, which extends beyond 

 the dark tip a distance almost equal 

 to the basal portion, the apical pecten 

 teeth with a longer median spine, 

 the basal ones with apical spines 

 subequal. Ventral tuft composed of 

 about six stout, compound hairs, 

 the dorsal extremity of last segment 

 bearing a pair of compound hairs; 

 posterior margin of the same or- 

 Fig. 82 Terminal segment of namentcd with peculiar groups of 



U. sapphirina 



small spines. 

 Distribution. This species was described from specimens taken 

 on Long Island and has been met with in New Jersey by Dr Smith, 

 and according to Theobald it has been obtained by Dr Howard at 

 Ithaca. 



