Only dead right valves having been found, it is not known whether this species be an Astarte (according to Messrs. Adams and Hanley) or an abnormal Crassatella. It scarcely differs from the young of Astarte omalia, from the Coralline Crag.
Genus Cardium, Ln. Subg. Fulvia, Gray, 1847, [or Lævicardium? Sw., 1840.]
Cardium (? modestum, var) centifilosum, Cpr. State Collection 381.
C. t. parvâ, tenuissimâ, inflatâ, subquadratim rotundatâ; umbonibus angustis, tumidioribus; marginibus, dorsalibus subalatis, antico et ventrali æqualiter rotundatis, postico vix truncato; totâ superficie, (nisi umbonibus et dorsum versus utroque latere lævibus,) tenue liratâ; liris circ. centum, quoad magnitudinem extantibus, angustis; interstitiis subæqualibus, subquadratis, interdum punctato-decus satis; parte posticâ à lineâ definitâ, lirulis minus conspicuis, laminis concentricis extantibus, crebrioribus eleganter exasperata; intus, dent. card. validioribus, lat. subdistantibus; cic. adduct. ovalibus, haud impressis.
Long. 0·51, lat. 0·48, alt. 0·34.
Hab. (modestum.) Quelpart Island, China Seas, and Japan; A. Adams.
(Centifilosum.) Monterey, 20 fms. alive; Santa Barbara 1, Catalina Island, 40 fm. Cooper.
Rounder than C. modestum, Ad. & Rve., with fewer and sharper ribs; but the Eastern shells vary, and Mr. Adams considers them conspecific.