864 Mr. A. Adams on Japanese Species of Ceecide. 
been derived were all collected by me during my explorations 
among the islands of the Japanese archipelago. 
Fam. Cecide. 
In order to ascertain what small species of shells were found 
in the seas of Japan, I was accustomed to reserve a portion of 
the bottom which was brought up in the dredge, and have it 
carefully washed and dried. In leisure moments I looked over 
the mud and sand so prepared, and discovered many curious 
and beautiful forms, most of them never before viewed by 
human eye. Among them were numerous specimens of Ceca, 
which I have submitted to the scrutiny of my friend Dr. P. P. 
Carpenter, who has made the knowledge of this little group 
especially his own. His results I will now give in his own 
words. Akasi, from which place I obtained so many, is 
situated in the Seto-Uchi or Inland Sea. 
1. Cocum gracile. 
“Mr. A. Adams obtained a large number of specimens at 
Gotto and Tanabe. Unfortunately all were dead, and mostly 
worn; but the characters of the species are plain. ‘The shape 
and sculpture are almost exactly like C. elegantissimum on a 
larger scale; ribs generally 18-20, sharp and distinct, with 
wide curved interspaces. The plug is almost flat, and (the 
specimens being weathered) the apex is not to be traced. By 
this character and the scarcely slanting mouth it is easily 
known from the other Japanese species. Dr. Stimpson’s spe- 
cimen had an unusual number of ribs, and this sharpness was 
worn off. No opercula were found.” 
2. Caecum vitreun. 
“On a close microscopic comparison side by side with the 
Teneriffe specimens, I am unable to detect any constant dif- 
ference, either in texture, shape, size, or form of plug. A 
large number of specimens, in fine condition, were obtained at 
Simoda, Akasi, O-Sima, and Tanabe. A variety has the plug 
flatter ; another variety much raised.” 
3. Cecum dextroversum. 
“Several fresh specimens of this species were found at 
Akasi and O-Sima with the plug as variable as in the Mazatlan 
shells.” 
4. Caecum Clarkii. 
“ Several specimens of this Teneriffe form were also found 
