OP OONCHOLOGY. 343 



LOTTIA GIGANTEA, Graj. 



Gray ms. in Brit. Mus., Sowerbj, Gen, f. 1 ; Reeve, Conch. 

 Syst.f. 1, (copied.) 



=J.. scutum,, nonmill. ms. (vide Mazatlan Catalogue, p. 208). • 

 non Escliscboltz, nee D'Orbigny. 



= [Tecturella'] grandis, Gray, Smithsonian Institute Chech 

 List, No. 176; British Association Report, 1861, p. 137. 



L. t. magna, crassiore, planatu, expans^i; textura srepius 

 spongiosii; nucleo minore, corneo, nigrofusco, ancyliformi, 

 vertice marnillato, subelevato; dein elongata, postice grisea, 

 undulata; t. adolescente verrucosa, radiis obscuris, antice baud 

 verrucosis; t, aduUa plus minusve lata; plus minusve radiata, 

 seu verrucosa ; apice plus minusve a margine remota; parte 

 antica seu baud projiciente, seu circiter quinta totius longitu- 

 dinis; parte postica plus minusve elevata, convexa: extus, ut 

 in "Acmgea pelta" picta, albido-grisea, fusco-olivaceo copiose 

 irregulariter strigata: intus, plerumque testa testudinaria, mar- 

 gine lato, nigro; spectro definito, fusco, seu rarius albido; cica- 

 trice muscular! fortiore, interdum purpureo seu violaceo tincta. 



Sp. normalis, A, long. 2-6, lat 2-05, alt. 7. 



" varians, B, " 2-95, " 2-35, " 8. 



Ex apice ad marg. ant. sp. A "45 ) Apicis alt. A "6. | 



" B -05 f " B -35. f 



Habitat. — California Inferior. 



Tbis sbell, by far tbe largest in tbe family, bas been long- 

 known in collections, and comes to us from various quarters 

 of tbe world. The United States Exploring Expedition spe- 

 cimens were duly labeled "Valparaiso." It is only known to 

 live, bowcver, in Middle and Lower California. The peculiar- 

 ity of tbe mantle-fringe was first pointed out to me by Dr. 

 Cooper in 1860, when preparing tbe Smithsonian Institute 

 Check Lists. To distinguish it, I proposed tbe name 'Tectu- 

 rella, in order to preserve tbe remembrance of Tectura, Milne 

 Edwards, wbicb falls as a synonym of Acnisea. I was not 

 aware that Dr. Stimpson bad previously employed it in his 

 ''Invertebrata of Grand Manan." I tlTen proposed tbe name 

 Lecania, under wbicb I may have distributed duplicates; but 

 on tbe eve of publication by Dr. Alcock (from whose notes I 

 bave copied the above diagYiosis of tbe animal) and myself, 

 I was fortunate enougb to obtain tbe loan of that very rare 

 but most excellent work "Sowerby's Genera," Avhicb was the 

 original of Mr. Reeve's well-known " Conchologia Systematica." 

 Here our very sbell appears, excellently figured, as tbe first 

 species of Gray's ^'Lottia,^^ and with his ms. name gigantea. 



