ADDENDA. 
7 Cooperi, Forbes var. Marrat’s pamphlet, pl. 1, f.13. California. 
Between the last and antillarum, Phil. Honduras. 
Sinarum, Phil. var. North China, 
Nodata, Hinds var., interior with two brown bands. Canton. 
Muricata, Quoy and Gaim, with the whole callous granular 
and plicate, Ceylon. 
2 Bimaculosa, A. Ad., with the hump on different parts of the 
back of the shell. 
Bimaculosa, A. Ad., passing into varieties of N. thersites, Brug. 
” os ,, of N. leptospira, A. Ad., 
and N. foveolata, D’k’r. 
Between N. striata, Reeve, and N. paucicostata, Marr. 
»  N. pura, Marr., and N. ambigua, Montg. 
» N. delicatula, A. Ad.,and ,, : 
Corrugata, Taylor Collection. A thin Columbella-like shell, 
with oblique ribs. California. 
Corrugata, var. broader, spotted with red-brown. 
3 var. elongated, scabrous. 
Acuta, Say, passing into the small form of N. sturmu, Phil. 
A variety of N. concinna, Powis, with the whorls rounded, 
causing a depression at the sutures. 
Another in which all the whorls, with the exception of the 
body-whorl and half of the penult, are white; here an 
injury has taken place, and the last turn and a half are 
banded. 
Another, very narrow, passing into the N. Smithii, Marr. 
with the beaded line at the sutures, deformed. 
> Between N. concinna, Powis, and N. japonica, A. Ad. 
Ceerulea, Marr. (See description. ) 
Plebecula, Gould, large aud thin, passing into the N. japonica, 
A. Ad. 
Plicosa, D’k’r., passing into the N. pallida, Powis. 
Marmorata, Anton, he N. graphitera, Beck. 
Undata, Marr., * N. Asperula, Brocchi. 
Elegans, Kien., % N. levigata, Marr. 
Canaliculata, Lam., __,, 5 
Hirta, Kien., ‘ N. monile, Kien. 
Algida, Reeve, ‘3 N. marmorata, Anton. 
