654 SUPPLEMENT. 
genus Anodonta or Glabaris. But Simpson places three species of my first subdivision 
in his Glabaris, viz. A. strebeli, A. glauca, and A. grijalue: as regards A. glauca, this 
may perhaps be understood by the confusion made by several authors between A. glauca 
and A. ciconia (see anted, pp. 532, 537), the true North-west Mexican A. glauca being, 
I suppose, nearer to A. globosa than to A. ciconia; while as to the two others, I must 
leave future workers to decide when the living animal is examined. 
Anodonta coarctata (p. 525). 
I am glad to state that Simpson also (Joc. cit. p. 630) unites A. coarctata and 
A. chapalensis into one species. 
Anodonta exilior (p. 530). 
A. “ glabrus,” Sow.,= A. viridana, Clessin, is considered by Simpson (/oc. cit. p. 922) 
to be synonymous with Glabaris inequivalvis, Lea, from the Lake of Nicaragua. On 
again comparing the original figures, I find that the outline of A. glabrus, in its 
shelving fore part and nearly straight ventral margin, agrees very well with that of 
A. exilior, and not at all with that of A. inequivalvis, so I must persist in retaining 
the two forms as distinct. 
Anodonta chalcoensis (p. 530). 
This is treated by Simpson (Joc. cit. p. 630) as synonymous with A. exilior; he 
gives the habitat of the latter as “ Mexico, mostly to the Pacific drainage,” which 
differs from the statements I have made concerning the locality of A. ewxilior and 
A. chaleoensis. Simpson supposes A. impura, Say, to be identical with A. henryana, 
but he also has not seen Say’s specimen. 
Anodonta lurulenta (p. 531). 
Simpson (loc. cit.) separates A. strebeli, Lea, far apart from A. lurulenta, Morelet, 
and places it in the genus Glabaris. I dare not oppose this course, for on a fresh 
examination of Lea’s figure I find that the sinulus is rather deep and pointed, as in 
Glabaris, though the general outline is very like that of A. lurulenta. 
Anodonta globosa and A. nopalatensis (pp. 532, 533). 
According to Simpson (loc. cit. p. 646), A. globosa is the young and A. nopalatensts 
the adult state of the same species; but the name <A. globosa must be retained, on 
account.of priority. He mentions a specimen 7} inches (190 mm.) long and 5} inches 
(139 mm.) high. 
MYCETOPUS (p. 539). 
Mycetopus weddelli (p. 540). 
Simpson (loc. cit.) identifies this species with M. pygmeus, Spix: I cannot adopt 
