NATURAL SCIENCES OP PHILADELPHIA. 95 



Pleurotoma Lam. 



P. Mull i c a en sis, pi. 2, fig. 8. Shell fusiform, robust; spire elevated, 

 whorls four or five, surface marked by numerous longitudinal ribs (crossed by 

 revolving lines ?) 



Locality and position. Upper bed, Mullica Hill, N. J. 



Arca Linn. 



A. quindecemradiata, pi. 2, fig. 2. Shell gibbous, inequilateral, beaks 

 incurved, umbones small; umbonal ridge subangular, and extends to the mar- 

 gin of the shell, surface marked by about fifteen radiating ribs, crossed by very 

 distinct lines of growth; no appearance of ribs on the cast, posterior to the 

 umbonal ridge. 



Locality . Common in the more northerly portions of the cretaceous deposits 

 of New Jersey. 



Cibota Brown. {Byssoarca Swains.) 



C. multiradiata,pl.2, fig. 1 . Shell small, gibbous, beaks incurved, um- 

 bones small, rounded; anterior ends rounded gently, basal margin slightly 

 sinuous, posterior rounded below, and inclined anteriorly above ; surface 

 marked by numerous fine radiating ribs ; margin crenulated. 



Locality and position. Green marl, Mullica Hill, N. J. 



Leda Schum. 



L. a n g u 1 a t a , pi. 2, fig. 12. Shell twice as wide as long, beaks small, curved 

 anteriorly, umbonal ridge angular and extending to the posterior basal margin ; 

 anterior margin rounded, basal very slightly sinuous, posterior, inclined an- 

 teriorly to the hinge line. 



Locality and position. Green marl, Burlington Co., N. J. 



The following communication from Mr. A. E. Jessup, Mr. E. A. 

 Jessup and Mrs. CHra J. Moore, children of the late Augustus E. Jes- 

 sup, was read. 



Philadelphia, March 6th, 1860. 



Isaac Lea, Esq., President of the Academy of Natural Sciences of Philadelphia. 



Dear Sir, The undersigned, children of the late Augustus E. Jessup, be- 

 lieving that it was his intention to leave a sum of money to the " Academy 

 of Natural Sciences," for the purposes stated below, and desiring to carry out 

 what we have cause to think were his intentions, propose to pay to the Acad- 

 emy the sum of one hundred and twenty dollars per annum, to be applied to 

 its Publication Fund, and the further sum of four hundred and eighty dollars 

 per annum, to be used for the support of one or more deserving poor young 

 man or men, who may desire to devote the whole of his or their time and 

 energies to the study of any of the Natural Sciences. 



The above sums we propose to pay as long as we feel our circumstances to 

 be such as will warrant our doing so, and we look forward to investing in 

 trust, at some not distant time, the principal of the sums named, for the pur- 

 pose of creating a perpetual fund for the above named uses. 



Signed, A. E. Jessup. 



E. A. Jessup. 

 Clara J. Moorb. 



On motion of Mr. Foulke, the letter was referred to a special com- 

 mittee of five. 

 I860.] 



