24 



541 Perna sulcata ? 

 542 



543 



544 



MALLEUS. 



545 Malleus albus 



546 vulgaris 



547 normalis 



548 anatinus 



549 vulsellatus 



550 decurtatus 



AVICULA. 



551 Avicula macroptera 



552 semi-sagitta 



553 lietcroptera 



554 falcata 



555 crocea 



556 Atlantica ? 



557 squamulosa, several varieties 



558 • papilionacea, several varieties 



559 costellata ? 



MELEAGRIJSfA, 



560 Meleagrina margaritifera 

 561 albiua 



LIMA. 



562 Lima inflata 



563 squamosa, several specimens 



564 glacialis 



565 fragilis 



566 Linguatula 



