152 



AMEEICAN JOURNAL 



Type. Rhynchonella 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 Rliijn'clionella. 



The recent species of this genus are : 



Fig. 30. 



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

 d, deltidium ; t, teeth ; t^, sockets ; c, oral lamelUe; ff, adductor scars ; r, car- 

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



Fig. 31. 



Fis. 32. 



Fig. 33. 



Figs. 31 — 33. li/iynchoneUa psit/acea, living, after BavreU, The arms appear 

 never to be exerted any further beyond the shell. 



Rhynchmella j^sittacea, Gmelin, Rve. Conch. Icon. pi. i, fig. 

 2 a, b, c. 



Bab. Boreal and Arctic Seas. 



Fig. 34. 



Fig. 34. Rhi/nchonella niyricans, Sby. ; a, adductors ; /, caecal end of intestine 



Rhynchonella nujricans, Sby., Thes. Conch, i, p. 342, pi. 71, 



fig. 81, 82. ' 



Hab. New Zealand and adjacent seas. 



