"""189^''] PROCEEDINGS OF THE NATIONAL MUSEUM. 475 



Siphonaria penjinae n. s. 



PI. i.vi. fig. 2. 



Shell irregulaily ovate, depressed, alternately radiately sculptured 

 with riblets and threads; apex eroded in the specimens, but situated 

 at about the posterior third; lines of growth obvious; margin entire or 

 slightly crenulated by the sculpture; interior smooth, muscular im 

 pressions strong", inteirupted at the right as usual in the genus; the 

 shells showing evident color markings consisting of alternate light and 

 dark radiating lines much as in S. Uneolata Orbigny. Lon. of shell, 

 20; max. lat., l^; alt. (somewhat eroded), 4 millimeters. 



Two specimens (Mus. Eeg. No. 4791) received from Dr. Stimpson. 



This species recalls S. lecanium Cpr., of the northwest coast of 

 America, but is very closely related to the S. radiata Ad. & Eve. 

 figured from the China seas in the "Voyage of the Samarang.^^ Two 

 species of Sqjhouaria, 8. fuUginata Rve. and *S'. atra Quoy & Gaim., are 

 known from the present seas of Japan and Korea, but neither so closely 

 resembles our fossil as the more tropical species above mentioned, 

 which indeed is hardly distinguishable from the form we have described. 



Conus okhoteiisis n. s. 

 PL LVi, fig. 4. 



Shell short, stout, solid, of about eight whorls; spire low and rounded, 

 suture appressed, with a few obscure spiral striae in front of it; shoulder 

 of the shell rounded; sides smooth, hardly striated even over the canal, 

 aperture rather wide, outer lip straight, sutural sinus shallow ; pillar 

 simple, slightly twisted at the end; lon. of shell, 50; lat., 35 millimeters. 



A young and an adult specimen (Mus. Reg. No. 4789) were presented 

 by Dr. Stimpson. 



This species is not unlike Conus calif ornicus on a larger scale, and 

 belongs, as well as can be judged in the absence of color markings, to 

 a group {Chdycoinis) which is most abundantly represented in the 

 Moluccas and on the shores of Africa. There does not appear to be at 

 present any closely related spe(;ies on the Japanese coasts, but G.fulmen 

 aiul C. 'pdupercnluH are found in that region and would in a general 

 way be associated with it. Among the recent species in the National 

 Museum, C. glaums from the Moluccas presents the closest parallel in 

 form and conchological characters. 



In the larger of the two fossil specimens a faint indication of what 

 might be taken as traces of spirally disposed color marks is perceptible, 

 but these are not sufficiently distinct to ])ermit of a dogmatic assertion 

 that they are traces of color and not an incident of mineralization. 



Cerithium cymatophorum n. s. 



PI. LVI, fig. 1. ^ 



Shell stout, solid, short, of seven or n)ore whorls; nucleus lost; 

 aperture defective; sculi)tur(' characterized by a constriction about the 



