102 THE NAUTILUS. 



0. zebra Kuster, Conch. Cab., Oliva, Tab. 5, 6, 1878. 

 Var. reticulata (Bolten). 



Porphyria reticulata Bolt. , Mus. Bolt., p. 33, 1798. 

 0. sanguinolenta Lam., Ann. du Mus., xvi, 316, 1810. 

 The grayish-white reticulated form is typical. The dark 

 olive-green, finely reticulated form is the var. reticulata. In the 

 latter case both Bolten and Lamarck refer to the same figures 

 (Martini, Conch. Cab. ii, Tab. 48, f. 512, 513). 



7. OLIVA TRICOLOR Lamarck. 



0. tricolor Lam., Ann. du Mus., 316, 1810. 

 0. guttida (Martini) Marr., Thes. Conch., iv, pi. xii, f. 

 165-168. 



var. philantha Duel., in Chenu's 111. Conch., ii, pi. 22, f. 5, 

 6. 



This species is more closely related to variegata than to elegans. 

 The var. philantha is the light-colored form often approaching 

 0. caerulea in external appearance. 



8. OLIVA OERULEA (Bolten). 



Porphyria caerulea Bolt., Mus. Bolt., xvi, p. 313, 1810. 

 0. episcopalis Lam., Ann. du Mus., xvi, p. 313, 1810. 

 Var. lugubris Lam., Ann. du Mus., xvi, 317, 1810. 

 The var. lugubris is based on the small form heavily clouded 

 with brown, as figured by Duclos, (Chenu's 111. Conch., ii, pi. 

 xi, f. 5, 6.) also by Marrat (Thes. Conch, iv, pi. 4. f. 48). It 

 was not figured by Lamarck. 



9. OLIVA ISPIDULA (Linne) 



Valuta ispidula Linne, Syst. Nat., 10 ed. p. 730, 1758. 

 0. hispidula Duel, in Chenu's 111. Conch., Oliva p. 14, 

 ispidula pi. 8. 



0. tigridella Duel, in Chenu's 111. Conch., pi. 9, f. 13, 14. 

 Var. stellata Duel. Chenu's 111. Conch., pi. 8, f. 11, 12. 

 Var. taeniata Link, Besch. Rostock Samml. , pi. 2, p. 98, 

 1807. 



Var. fiaveola Duel., Chenu's 111. Conch., pi. 7, f. 17-20. 



Var. Candida Lam., Ann. du Mus., xvi, p. 322. 



This extremely variable species, most readily distinguished 



