54 Hentz's Descriptions of the 



arrangement of the teeth, in the deep transverse sulci, and 

 in its length compared with its height and width. It is 

 scarce. 



BULLA OCCULTA. 



t 



PI. IV. Fig. 11. 



B. test^ parva, ovato-cylindric^ : spircl occultti: labro suprk elevato, medio 

 recto; apertura sub-angusta, infrti latci, rotundatd. 



/S'/ieZ^ small, of a dingy white color, ovate-cylindrical, cover- 

 ed with very minute transverse striae, and with indistinct longi- 

 tudinal striae of growth ; spire concealed ; labrum extends a 

 little below the spire, nearly straight above the centre^ regu- 

 larly rounded below and at the base ; aperture narrow at the 

 upper part, rather broad at the base. 



Length i inch ; breadth -^^ inch. 



Cabinets of Bost. Soc. Nat. Hist., Amherst and Middlebury 

 Colleges, J. W. Mighels, and C. B. Adams. 



Remarks. If not identical with, this shell is the analogue 

 of, B. triticea, Couth. It however differs from that species in 

 being proportionably wider. It is very scarce. 



Art. VL— descriptions AND FIGURES OF THE ARANEIDES 

 OF THE UNITED STATES. Br Nicholas Marcellus Hentz. 



(Communicated July, 1841.) 



The Publishing Committee think it proper to inform the 

 readers of this Journal, that the following article is the first of 

 a series on the Araneides of the United States, which has 

 been offered for publication, by the author, to the Boston So- 

 ciety of Natural History. These descriptions and figures will 

 be followed hereafter by others, and the whole will form an 

 illustrated monograph of all the Spiders observed by Professor 

 Hentz in various parts of this country, and will supply a want 



