116 JAPANESE MOLLUSKS, PELECYPODA. 



Dentalium octogonum Lam. Lischke, Jap. Meeres-Conch., Ill, pi. 5, f. 1-3. Z). 

 hexagonum Gld., Lischke,!. c., pi. 5, f. 4-7; D. japonicum Dkr., Ind. Moll. Mar. 

 Jap., p. 153, pi. 5, f. 2. 



Kii coast (Stearns) ; Matozaand Ooshima Harbors, 6-8 fras. (St. 

 John). 



From a study of several hundred specimens collected by Mr. 

 Stearns I am disposed to consider octogonum, hexagonum and japon- 

 icum merely forms of one species. The development of interstitial 

 longitudinal riblets is very variable. 

 Dentalium sexcostatum Sby. Ann. Mag., 1875, Vol. XVI, p. 113. 



Cape Shima, 18 fath.,Goza Harb., 6 fath., sandy mud (St. John). 

 Dentalium weinkauffi Dunker. Dkr., Index, p. 153, pi. 5,f. 1. 



Japan (Dkr.) ; Bishiu coast (Stearns). 



In the specimens before me the longitudinal riblets do not extend 

 so far toward the aperture as Dunker's figure shows. 

 Dentalium buooinulum Old. Otia Conoh., p. 119. 



Kagoshima (Stimpson). 

 Dentalium yokohamense Watson. Challenger Gaatrop, 1873-6, XV, p. 11, pi. 2, f. 



Yokohama, 8 fathoms (Chall.). 

 Dentalium semipolitum Sby. Ann. Mag., 1875, XVI, p. 113. 



Cape Shima and Matoza Harb., 6-18 fath. (St. John). 



PELECYPODA. 

 TELEODESMACEA. 



(Adesmacea.) 

 TEREDINIDJE. 



Teredo japonioa Clessin. Conchyl. Cab., p. 78, pi. 20, f. 9, 10. 

 Japan. 



PHOLADIDJE. 

 Pholas (Barnea) fragilis Sowerby. Thes., 11, p. 488, f. 92, 93. 



Nagasaki (Lischke). 

 Pholas (Barnea) manilensis Phil. Abbild., Ill, p. 51, pi. 1, f. 2. 



Numerous fresh specimens collected by Stearns, but exact locality 

 unknown. The margins of the gape are less acutely denticulate 

 than in typical examples, and more concave. These differences prob- 

 ably indicate a distinct race, which may be called var. inornata. 



Zirphaea crispata Linne, Japan (Dkr., Stearns). 



