KONGL. SV. VET. AKADKMIKNS HANDLINGAR. 



i:\ni 



> 34. \.(» 8. 



71 



CONCLUSIONS. 



In reviewing the genera and species enumerated above, as to their number in which 

 the structure of the maculse has been observed, we arrive al the following rcsults. 



i 



2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 



10 

 11 

 12 

 13 

 11 

 15 

 lfi 

 17 

 18 

 19 

 20 



G e ii c r u. 



Acaste 



Acidaspis 



Asaphus 



Barrandia 



Bronteus 



Bumastus 



Calymmene 



Centropleura 



Chasmops 



Chirurus 



Ctenopyge? 



Dalmanites 



Dysplanus 



Encrinurus 



Griffithides 



Harpes 



Harpina 



Holmia 



Homalonotas 



Hysterolenus 



Carried forward 



Number of 



species with 



maculae. 



1 

 1? 



18 



1 

 9 

 7 

 4 

 1 

 1 

 9 

 1 

 10 

 2 

 3 

 1 

 2 

 1 

 2 

 2 

 1 



Number of 

 species in 

 the maculse 

 of which 

 the structure 

 has been 

 cxaniined. 



77 



23 



21 

 22 



23 

 24 

 25 

 26 

 27 

 28 

 29 

 30 

 31 

 32 

 33 

 34 

 35 

 36 

 37 

 38 

 39 



c n e r a. 



Number oi 



species \\ ith 



maculse. 



Brought forward 



Ilhrnus 



Lichas 



Megalaspides 



Megalaspis 



Nileus 



Niobe 



Ogygia 



Paradoxides ' 



Peltura 



Pliacops 



Phaétonides 



Phillipsia 



Platynietopus 



Pliomera 



Proetus 



Ptychoparia 



Ptychopyge 



»Schmidtia 



Trochurus 



Total 



Number of 

 apecies in 

 the mai ulae 

 of which 

 the Btructurc 

 has been 

 examiiH d. 



We have thus 136 species of 39 genera in which hypostomic maculse have been 

 found and only 36 species, in which it has been possible to study the structure of the 

 maculse through sections. 



Common for a great number of maculse in various groups, vvhether they show any 

 organic structure or not, is the excessive thinness of their shell in comparison with that 

 of the surrounding hypostoma. This is also in accordance with the tenuity of the ce- 

 phalic eyes in relation to the test of the cheeks. 



1 To these have here been added two Bohemian species P. bohemicus and P. spinosus omitted above 

 at page 64. 



