(194) 



EXPLANATION OF PLATE XX. 

 Botellina pinnata, sp. nov. 



Fig. 



1. a, Branching form, showing three offshoots from one primordial chamber ; 

 b, primordial chamber detached from the main test by the trawl when 

 captured ; slightly enlarged. 



The fractured parts, c c, shown in this figure were found to fit each 

 other exactly ; e, pseudopodial (?) apertures. Station 11,074 ; off Cape 

 Natal ; depth, 55 fathoms. 



2-3. Typical forms of B. pinnata, with primordial chambers restored ; the 

 pseudopodial apertures are shown armed with delicate spicules ; e e, 

 pseudopodial (?) apertures. Station 11,074. 



4. A somewhat compressed form, with double branching of pinnate outgrowths ; 



primordial chamber broken off from distal portion of test ; slightly 

 enlarged. Station 593-594. 



5. A double branching form minus the primordial chamber ; slightly enlarged ; 



this form of test was found comparatively common. Station 781 ; 

 depth, 45 fathoms. 



6. Specimen from Station 805-806, showing new offshoot from an old fracture 



of the test ; natural size. 



7. Detached primordial chamber before being ground down to show the interior 



and wall chambers ; natural size ; e, pseudopodial (?) apertures. 



8. Detached primordial chamber (fig. 7), after a portion of one side has been 



ground away longitudinally; (microphoto) magnified 4 diameters; a, 

 interior of main chamber ; b, wall chambers ; c, elongated neck showing 

 tubular passage communicating to the upper portion of the main test 

 and pinnate outgrowths ; d, external covering of cement. 



9. Micro-photograph of a transverse section across one of the pinnate out- 



growths ; magnified 12 diameters ; a, main passage which forms the 

 direct communication to the primordial chamber ; b b, septa ; c, wall 

 chambers ; d, thin layer of cement which forms the outer coating of 

 the test. 



10. Micro-photograph of a part longitudinal section of a portion of the test, 



magnified 4 diameters ; a, main passage ; b, tubular openings from 

 the wall chambers into main passage ; c, wall chambers exposed after 

 external coating of cement has been removed. 



11. Micro-photograph of a longitudinal section of two of the pinnate out- 



growths showing numerous openings from wall chambers ; a a, 

 pseudopodial apertures. (See also woodcut, p. 190.) 



