PLATE XXXIV. 



Fig. 1. PlexaureUa (P seudeunicea) grandiflora V. Characteristic spicules of type, No. 4501, 



Page. 



X 132 



388 



386 



2. PlexaureUa pumila V. Characteristic spicules of type, No. 4502, X 132; g, a peculiar 



large, bisymmetrical twinned spicule consisting of two united crosses; 6, an unusual 

 form, a large cone-club 



3. PlexaureUa braziliana V. Characteristic spicules of the type, No. 1598; m, an irregular 



twinned spicule or imperfect cross; i, t', tripartite forms, X 132 385 



3a. The same. Four of the more regular crosses, X 132 385 



4. PlexaureUa cylindrica, No. 1597. Characteristic spicules of the type; h, a peculiar large 



irregularly twinned spicule, X 132 384 



5. PlexaureUa verrucosa V. No. 4503. Characteristic spicules of the type; d, a peculiar 



doubly twinned form, X 132 387 



6. PlexaureUa obesa V. No. 4509. Characteristic spicules of the type; /, /', large irregular 



and imperfect crosses, X_132 383 



