the rostrum, and in havin a i acttagk furrow accom pan yin: 
suture ; and it is destitute also of the white zones. The aha 
lar portion is also ae and has a strongly marked projecting 
angle at the middle. e figure given of it by Mr. Linsley is 
ar too much earch, oe marked with revolving lines not 
found on the shell. 
Buectnum zonate. (No. 281.) Testa minuta, solida, Fig. 8. 
leevi, fasihotensy pallide incarnaté; anfr. ultimo zona lac- = 
tea, infra-suturali et alteri mediani cincto: spira conica, 
acuta, anfr. 6 convexiuseulis: apertura angusta, sub- 
ovali; canali products. 8. 
Long. }, lat. ; 
A small, fabitermi solid, smooth, pale flesh-colored  guceinum 
shell, having a white band just below the suture, and = znale. 
another around the middle of the last whorl. Its other characters 
may be gathered by comparison with those of F'usus Trumbulli 
above given. It resembles B. dunatém, Say, and its generic 
lace is somewhat equivocal. 
[The figures are magnified four diameters, except 4 and 5, 
which are reduced one-half. } 
Arr. X roe —Results of Analytical Recoischia in the Nep- 
nian Theory of Uranus; by Exocu F. Burr. 
Tue early elements of Neptune have heen made the basis nef 
inet researches in the theory of Uranus. The results were 
not satisfactory. ‘They failed to recognize in the new planet 
the sole source of those anomalous movements which have so 
astronomets, or even to interpret them largely 
without Deckbihes conditions entirely at variance with ob- 
servation. 
isdapiaciiiens to its effect on the meat? longitude of Uranus, as 
far as terms of the fourth wtct in eccentricities and inclinations. 
On account of the near approach to ecommensurability in the 
mean motions, the-coefficients of some of the inequalities were 
excessively large, and, consequently, their secular variations very 
appreciable: but by a ‘stiitable disposition of the epoch and some 
considerations to which we shall have-oecasion to refer, the ne- 
cessity of their numerical computation was avoided. ‘The results 
obtained were not satisfactory. »T'o éffect a reduction of the 
modern residual perturbations two-thirds, a mass was required for 
Neptune tot to accord with probability. ea 
