Excerpt from Proceedings of the United States National Museum, Vol. 1: 1878
Hab. - Western Alentians, near low-water mark; Dall.
This bears no marked resemblance to any of the other Alaskan species.
Genus Tonicella Cpr.
Type Chiton Marmoreus Fabr.
Tonicella saccharina Dall, n. s.
T. T. para, oblonga, tota superficie saccharina, rufo et albescente picta; muerone submediano, inconspicuo; areis lateralis inconspicue elevatis, albescentis; areis dorsualis sanguinosis, ?que quincuncialiter lente reticulatis; v. ant. 10-11-, v. post. 8-10-, v. centr. 1 fissatis; dent. parvies spongiosis, sinu parvo; subgrundis spongiosis, mediocris; zona coriacea ut in Tonicell? aliis: branchi? medi?. Lon. 6.5, lat. 4mm.
Genus Schizoplax Dall.
Testa et zona Tonicell? simulans; valv? centrates sulco jugali mediano, antico argute incis?; branchi? subambientes.
Type Chiton Brandtii Midd.
For this remarkable Alaskan form, distinguished from all other Chitons by its slit central valves, I propose to adopt a name suggested by Dr. Carpenter, who, on Middendorf"s figures, had intended to propose it as a subgenus or Tonicella. The specimens obtained by my party seem to be the first found since the original ones were obtained. A careful examination of the soft parts shows that in dentition and some other details sufficient basis for generic separation is found, confirming the testimony of the valve characters. The sulcus is usually filled by a horny or cartilaginous deposit.
It may be added here that investigation of the characters of the radula in numerous species and genera of Chitons in the National Museum shows a very remarkable uniformity of dentition. No larger groups than genera are indicated in the whole order, which, it appears, can hardly comprise more than one family; and it is doubtful if this can be divided into subfamilies by any characters yet elucidated.
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