312 BULLETIN OF THE 



impressed line of the left valve concave forward as it sweeps in a broad curve 

 from the small blunt beaks to about the middle of the base. Its surface is very 

 finely concentrically striated without radiating sculpture except the fine raised 

 lines which extend from the beaks to the tip of the rostrum, which is a little 

 deflected to the left. The shell is almost ilat and nearly equivalve, of a waxen 

 white, pearly within, and with a few radiating striae. The hinge is that oJ 

 Clidiophora, and it is a much more slender shell than P. carolinensis, being 

 only 8.0 mm. in height to 20.0 mm. in length, and less than 2.0 mm. in maxi- 

 mum diameter; the anterior part is only 3.5 mm. long. The anterior cardinal 

 area is linear, the posterior grooved out and bordered especially in the right 

 valve by a broad rib. This is the widest part of the whole shell. Numerous 

 valves were obtained at Stations 2592 and 2597, U. S. Fish Commission, oflf 

 Hatteras.* 



This species was dredged alive in 6 fms. at Tampa, Florida, by Mr. Chas. T. 

 Simpson. With it was found a smaller species, belonging to the Pandora or 

 Kennerlia section of the genus. This, to which I propose to give the name of 

 P. Biishiatia, differs from all the known species of the group in having the 

 posterior cardinal margin convex, and the rostrum bent downward instead of 

 upward. The beaks are very anterior, and the anterior cardinal margin, 

 marked with a sharp keel setting off an almost linear area, descends from the 

 beaks in a straight line, the curve of the base commencing suddenly at a 

 rather obtuse angle, and following an even curve, is slightly inflexed only near 

 the posterior tip, below the short square-ended rostrum; the shell is very thin, 

 the left valve somewhat convex, the right one concave, both sculptured with 

 silky concentric striae; the margins of the two valves coincide; the beaks are 

 small, hardly rising above the long arch of the back; the right valve has a 

 strong keel on its upper posterior margin, and no other radiating sculpture; 

 the left valve has an impressed line from the beaks to the base a little behind 

 them, but which does not indent the basal margin ; there is also a sharp thread 

 from the beak to the lower angle of the rostrum; above this thread, as usual, 



* As this species is clearly different from the form figured in Binney's Gould 

 under the name of trilineata, and generally so called by American concliologists, I 

 had thought it new, and intended to name it P. (C.) Jioridana ; hut referring to 

 Say's original description and figure, I found that the southern form which he 

 described and figured (poorly) is the one he named trilineata, and, as far as I can 

 discover, the northern form has had no name given to it which it can retain. 

 Specimens in the British Museum were labelled nasuta Sowerby, but they are not 

 the true naifuta of Sowerby according to Reeve, who had the advantage of Car- 

 penter's monographic determinations, and figures the genuine nasuta, which in any 

 case would be a synonym of the southern form. The tabacea of Meuschen (Mus. 

 Gronovianum) is known only by a very poor figure ; the P. depressa of Sowerby, 

 whicii has been identified with it, according to Deshayes, is a native of the Pacific 

 Ocean. I would therefore propose for the high, concentrically undulated New Eng- 

 land shell the name of Pandora ( Clidiophora) Gouldiana, in honor of the late Dr. A. A. 

 Gould. 



