PLATE XXXIX. 



Barbandeocebas natatob (page 308). 



Figure 1. Side view of the type and only known specimen of this species, which is 



little more than an imperfect cast of the interior of the shell, from the 



Chazy limestone at the Mingan Islands. 

 M 1 a. Part of the other side of the same specimen, with the test preserved, and 



shewing the surface markings. 

 II 1 h. Outline of a transverse s(?ction of part of the same specimen, shewing the 



lateral compression, and the position of the siphuncle ; V being the 



venter. 



