OLENELLUS AND OTHER GENERA OF MESONACID^ 



PAGE 

 Lesley, J. P., bibliographic reference 375 



Liniulus, Agassiz on the habits of the young of 241 



eye of compared with that of Apus 239 



Olenellus 327 



Olenellus gilherti 239 



trilobites 239 



habits of 241 



telson of compared with that of Olenellus 246, 312 



Limulus polyphctnits, eyes of compared with those of Olenellus gUberti. .. 2)-7 



Lindstrom, Dr. G., bibliographic reference 375 



on the types of eyes in trilobites 239-240 



visual organs on the hypostomas of trilobites 240 



Lingulella {Lingulepis) rozuci, mentioned 300 



Linnarsson, J. G. O., bibliographic references 375 



Loch Maree, fossils from 324. ;i^2, 336, 342, 350 



Inndgreni, see Holmia. 



AlcConnell, R. G., bibliographic reference 375 



Maculae on the hypostomas of trilobites 240 



niaguificus, see Metadoxides. 



Manuels Brook, fossils from 280 



Marcou, J., bibliographic references 375 



Marr, John E., bibliographic reference 375 



on the posterior segments of Mesonacis vennontana and the telson 



of Olenellus 313-314 



Matthew, G. F., bibliographic references 376 



on absence of Holmia kjenilft from New Brunswick collections. .. . 376 



Mesonacidse Walcott 236 



abrupt appearance of 252 



alphabetic list of species assigned to 35I-37I 



anterior glabellar lobe in 242, 243 



cause of enlargement of third segment in 245 



cephalon, development of 236-244 



segmentation of 237-238 



delimitation of genera of 246 



development of 236-250 



from an Anellidian-like ancestor 249 



shown in diagram 249 



distinguished from the Paradoxinse 250 



eyes of 239 



facial sutures in 242 



fauna, name proposed 252 



first use of term and reasons for its use 233 



genal, intergenal, and antero-lateral spines in 237 



geographic distribution of 252-253 



hypostoma of 243-244 



maculee on hj'postoma of 240-241 



possible occurrence in Siberia, Australia, Sardina, Spain and France 253 



