206 THE AMERICAN MONTHLY [July, 



Classification of the Radiolaria: Key to the Species of 



Barbadoes. 



By REV. FRED'K B. CARTER, 



MONTCLAIR, N. J. 



Continued from p. 85, March, 1895. 



79. ZYGOCmCUS. 



Ring without edges; 10-15 spines polygonias 



Ring with interrupted edges 10-20 or more spines butschlu 



80. DENDROCIRCUS. 



Eight-twelve branched acute spines ; numerous smaller spines... .barbadensis 



81. CORTINA. 



Three forked horizontal spines ; 3 divergent forked feet furcata 



82. STEPHANIUM. 



Rings thorny ; thorny apical horn ; 4 branched feet tetrapus 



83. SEMANTIS. 



Sagittal ring ovate, with 4 pairs of branched spines spinescens 



84. SEMANTRUM. 



Sagittal ring nearly semi-circular thorny mulleri 



Sagittal ring circular, smooth sphragisma 



Sagittal ring triangular, w^ith branched thorns butschlu 



85. SEMANTIDIUM. 



Sagittal ring elliptical, with 3pairs of branched spined haeckelii 



86. CORTINISCUS. 



Sagittal ring with branched thorns ; basal ring with 4 gates .tetrapylaris 



87. STEPHANISCUS. 

 Basal ring nearly square ; 4 feet branched medusinus 



88. PODOCORONIS. 



Basal ring kidney-shaped, with 3 feet tripodiscus 



Basal ring violin-shaped, with 10-12 feet petalospyris 



89. TRISTEPHANIUM. 



Sagittal ring ovate ; frontal, violin shaped ; basal, kidney -shaped., hartwigii 



90. MICROCUBUS. 



All 12 gates simple ; all rings tuberculate pentocircus 



