INDEX AND SYNONYMY. 303 



PAGE. 



Obligata (Littorina), Say. Journ. Phila. Acad.. ii, p. 241. 



L. rudis, Montg. var. . ...... 241 



Obliquus (Modulus), Ad. Zool. Proc., p. 204, 1850, . . 262 

 Obscura (Planaxis), A. Ad. Zool. Proc., p. 271, 1851. 



? = P. sulcatus, Born ......... 276 



Obsoletus (Planaxis), Menke. Zeitsch. fiir Malak., p. 170, 



1850. =s P. nigritellus, Forbes ....... 278 



Obtusa (Isapis), Carp. 2d Report, 142, ..... 273 



Obtusata (Littorina), Linn. Syst. Nat. Ed., xii, p. 1232, . 252 

 Obtusata (Littorina tenebrosa), var.), Midd. Mai. Ross., ii, 



p. 63, t. 8, f. 1-5. = L. littoralis, Linn ..... 242 

 Obtusatus (Modulus), Phil. Conch. Cab., ii, 1846. 



= M. tectum, Gm. var ........ 260 



Olivacea (Cithna), Verrill. Conn. Trans., vi, p. 185, t. 29, f. 



5, 1884, ........ .269 



Orbignyi (Fossarus), Fischer. Jour, de Conch., 256, 1864. 



= F. sulcatus, Wood ......... 271 



Ovoideus (Fossarus), Gould. Zool. Proc., 1856, . . 273 



, Swainson, 219, 351, 1840. = Tectarius, Val. . 231 

 Pagodula (Alaba), A. Ad. Ann. & Mag., x, p. 297, 1862, . 282 

 Pagodus, Gray. Beechey's Voy., 141, 1839. 



= Tectarius, Val ........ .231 



Pagodus (Turbo), Linn. Syst. Nat. Ed., xii, p. 1234, . . 256 

 Pallescens (Littorina), Phil. Zool. Proc., p. 142, 1845. 



= L. filosa, Sowb ......... 244 



Palliata (Littorina), Say. Journ. Phila. Acad., ii, p. 240. 



= L. littoralis, Linn. var. ....... 242 



Pallidula (Lacuna), DaCosta. Test. Brit., t. 4, f. 4, 5, 1778, . 2(55 

 Pallidula (Lacuna), Meyer & Mob. Kieler Bucht., p. 25, 

 1872. = L. puteolus, Turt ....... 265 



Pallidus (Turbo), Donov. Brit. Conch., t. 178, f. 4. 



Lacuna crassior, Mont. . . . . . . . 267 



Paludinella (Littorina), Reeve. Conch. Icon., f. 84, 1857, . 255 

 Papillosa (Littorina), Lam. Anim. sans Vert., vii, p. 32. 



= L. bullata, Marty n ......... 257 



Parcipictua (Fossarus), Cpr. Ann. & Mag., xiii, p. 476, 1864, 274 

 Parva (Cochlea), DaCosta. Brit. Conch., 1798. 



= Lacuna puteola, Turton. ....... 265 



Parvula (Lacuna), H. Martin MSS. Monts. Conch. Medit., 

 109. = Megalomphalus azonus, Brus. .... 268 



Parvula (Lacuna), Velain. Archiv. Zool. Exper., vi, p. 113, 

 t. 3, f. 11,12, 1877, ........ 270 



Parvula (Littorina), Phil. Zeitsch. fiir Malak., p. 149, 1848, . 255 

 Parvula (Risella), Dkr. Mai. Blatt., viii, p. 42, 1862. 



= R. tantilla, Gld. var ........ 2153 



Patula (Fossarina), A. Ad. & Angas. Zool. Proc., p. 425, 

 1863, . . 27<i 



