118 THE AMERICAN MONTHLY [Apr., 



Shell ovate or spindle-shaped. Ribs prolonged into ter- 

 minal feet. Artophor7nis. 

 38.— Family : LITHOCAMPIDA. No radial apophy- 

 ses. 



MOUTH OPEN. 



Transverse strictures not connected by spiral line. 



Shell conical or cylindrical. Mouth not constricted. 

 Conical. Horn, Lithostrobus. 



Conical. No horn. Dictyomitra. 



Cylindrical. Horn. Artostrobus. 



Cylindrical. No horn. Lithomitra. 



Shell ovate or spindle-shaped. 



Mouth of last joint constricted. 

 Cephalis with horn. Last joint not tubular. Eucyrtidiuin. 

 Cephalis with horn. Last joint a long tube. Eusyringiuni. 

 Cephalis without horn. Cephalis with tube. Siphocampe. 

 Cephalis without horn. Cephalis without tube. Lithocampe. 



MOUTH CLOSED. 



Last joint rounded, without vertical basal spine. 

 Cephalis without horn. Stichocapsa. 



Last joint conical, pointed, with vertical basal spine. 

 Cephalis with horn, Artocapsa. 



In addition to the 71 genera of the SPUMELLARIA 

 and the 120 genera of the NASELLARIA, of which I 

 have now given the classification, Haeckel mentions 3 

 genera of the Legion PH^ODARIA as being found in 

 Barbadoes, namely Mesocena, Dictyocha, and Distepliarius 

 which belong to the family Caimorhaphida ; but unless 

 I am very much mistaken they have lately been ruled 

 out as not being true Radiolaria. I have not thought it 

 worth while therefore to do more than append the names. 



Since writing the above I find it stated in an appendix 

 to Haeckel's work that three more genera have been found 

 in Barbadoes, namely, Cortina, Stephanium, and J&tephati- 

 iscus; they belong to the 8tephoidea, the first and second 

 to the Family Stephanida, the third to the Family Se- 



