152 



AMERICAN JOUKNAL 



Type. Rhynclionella loxia, Fischer, Dav. Int. Brit. Brach. 

 pi. vii, fig. 99—107. 



It is very desirable that the structure of the crura in this spe- 

 cies should be examined, as it is very probable that it may prove 

 quite different from that of the recent species now generally 

 known by the name of RhynclLonella. 



The recent species of this genus are : 



Fi?. 30. 



Fig. 30. Interior of valves of RhyncheneUa psittacea ; s, septum ; /, foramen ; 

 d, deltidium ; i, teeth ; t^, sockets ; c, oral lamellre; a, adductor scars ; r, car- 

 dinal do. ; />, pedicel do. ; o, ovarian spaces. 



Fig. 31. 



Fig. 32. 



Fig. .33. 



Figs. 31 — 33. K/iync/toneU'i psittacea, Uving, Sifter BtivretX. The arras appear 

 never to be exerted any further beyond the shell. 



RhynchoneUa jmttacea, Gmelin, Rve. Conch. Icon. pi. i, fig. 

 2 a, b, c. 



Bab. Boreal and Arctic Seas. 



Fig. 34. 

 Fig. 34. RhynchoneUa nigricans, Sby. ; a, adductors ; i, caecal end of intestine 



RhynchoneUa nigricans, Sby., Thes. Conch, i, p. 342, pi. 71, 

 fig. 81, 82. 



Hah. New Zealand and adjacent seas. 



