As mentioned in my paper on early trilobite types ( 1940 p. 121 ), Kjerulf ( 1865) introduced a new trilobite species which has not been adopted by later writers on account of incomplete description and apparant lack of type specimen. In his "Veiviser ved geologiske excursioner i Christiania omegn" he gives a scematic woodcut of a complete trilobite specimen which he refers to the new species Illænus glaber, or Illænus Dalm. glaber Musæum Christianiæ. The figure and name is not accompanied by any description, but a certain affinity to a British species is indicated by the reference: "An I. perovalis Murch. Silur. Syst. 661 pl. 23. 7" . The specimen is found at Ladegaardsøen ( = Bygdøy near Oslo) in "etage 4" which comprises chiefly the Middle and Upper Ordovician.
1942
Supplement to "Early description of Norwegian trilobites". The type specimen of Illænus glaber Kjerulf
22
1, 2
47-51