2 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.79 



to the former. I am informed by Profe.ssor Joh. Chr. Moborg, of Lund, that 

 by a former law or custom of the university tise professor was considered the 

 author of all papers which a student under him defended. According to this, 

 Iletzius must be credited with the genus. This law was repealed in I.und in 

 1852. 



Retzius seems to Iiave been legislated into authorship instead of 

 writing himself into it. 



According to Ortmann (1911), American species of " Unio " be- 

 long to tlie genus EUiptio. The genus U7iio is reserved for Unio plc- 

 torum, etc. 



Another note by Simpson (1900, p. 674) says tliat " E-etzius' first 

 species in Unio, tlie type of a section without laterals, is the U. mar- 

 garitifer, but in 1792 Bruguiere in Choix de Memoires, I, p. 106, 

 fully and carefully redefined the genus Unio, restricting it to species 

 with cardinal and lateral teeth." Up to this time, 1792, notliing had 

 been done tovv'ard classifying the naiades having neither cardinal nor 

 lateral teeth. Bruguiere (1792&, p. 131) described tliQ genus Ano- 

 dontites, founded on the new species crispata. His description and 

 figure of this genus and species lie at the root of the later study of 

 tlie edentulous naiades, especially those from South America and 

 West Africa. As his description and figure are inaccessible to many 

 students, a translation and a copy of his figures are given herein. 



Bruguiere took what we call the front end of th^ shell to be the 

 back end, and vice versa, the height to be the length, the length to 

 be the width. In the translation the following substitutions have 

 been made in order to have Bruguiere's terms ^ conform to terms 

 now in use: 



Anterior substituted for posterior. 



Posterior substituted for anterior. 



Height substituted for length. 



Length substituted for breadth. 



Peak substituted for summit. 



Concentric striae substituted for transverse striae. 



Radiating striae substituted for longitudinal striae. 



Muscle scar substituted for muscular attachment. 



The Latin diagnosis is given verbatim. 



ON A NEW SHELL OF THE GENUS ANODONTITES' 

 By J. G. Bruguikkb 



In the Linnaoan system the genus of the Moule (Mussel. Mytilus) comprises 

 shells so essentially different tliat among 20 species treated by that author there 

 are really only 11 that belong to it; the others go into the genus of the Huitre 

 (Oyster. Osfrca), into those of the llyronde {Avicula, etc.) or of the Cardita, 

 and 2 of them belong to the genus AnodovJite (.Anodontitcs), of which I am 

 about to give the description. 



2 Marshall (1930b, p. 41) published notes on Brutcuifere's use of terms. 



a From Journal d'mstoire Naturelle, vol. 1, pp. 131-lo0, pi. 8, figs. 6, 7, 1792. 



