T. t. parvâ, tenui, albâ, postice latâ, antice attenuatâ; anfr. nucl. ii. minutis, lævibus, attenuatis, vertice declivi, celato; norm. (t. adolescente) iv. subtriangulatis, postice tabulatis, axi fere rectangulatis; suturis acute impressis; antice rapidissime angustatis, canali longâ, arcuatâ; varicibus circ. vii. laminalis, acutis, ad angulum in spinam apertam compressis, spinis radiantibus, parum superne arcuatis; lineâ seu angulo obsoleto peripheriali, suturam continuante; aperturâ pyriformi; labro antice haud indentato.
Long. 0·35, long. spir. 0·15, lat. 0·15, div. 70°.
Hab. Catalina Island, 60 fm.; 4 alive, of equal size, Cooper.
Resembles the young of Murex centrifuga, Hds., and is related to Trophon muricatus, Hds.
Besides the above species, which were entirely new to science, the fresh and perfect specimens collected by Dr. Cooper, on the Survey, from authentic localities have enabled me to make out and complete the diagnoses of many species first found indeed by other naturalists, but in such poor condition, or with such uncertainty of habitat, that it would have been unsafe to have ventured on their description.
[16] From the Greek, for twisted tooth.
[17] From the Greek for a sawyer; from the serration of the teeth, which is unique in the family.
[18] From the Greek for rough skin.
[19] A small island in the British Channel.
[20] From the Greek for chamber on both sides.