1888 .] 
45 
[Scudder, 
that the mouth parts of all beetle larvae are more like those of adult 
beetles than they are like those of any other order of insects. This 
is probably an example of what Hyatt and Cope call concentra- 
tion of development, and which is elsewhere called precocious in- 
heritance. It is an instance where the characters of the adult have 
been impressed on the larval stages. 
11. In beetle larvae we have quite a number of cases in which a 
similar larval type has been acquired independently in two or more 
families. 
The above conclusions apply only to the group of Coleoptera, 
and while some of them will doubtless be found equally true of other 
orders of insects, some of them are probably peculiar to beetles. 
This paper was discussed by Professors Hyatt, Putnam and 
Fernald, and by Messrs. Sargent and Jackson. 
Dr. Fewkes called the attention of the Society to models of an- 
imals which were made by Mr. S. F. Denton. These models are 
made of an elastic material and in many respects were much supe- 
rior to any which he had yet seen. He congratulated Mr. Denton 
on his success in the preparation of these models. 
The several models were passed about the hall and Mr. Denton 
replied to questions by Prof. Hyatt, Mr. Emerton and others. 
Professor Putnam exhibited Gordian-like worms found four feet 
below the surface, near the “Serpent Mound.” 
Dr. Fewkes exhibited a specimen of Hexactinellid Sponge 
allied to Rosella antarctica , found in shallow water near Monterey, 
California. He said that Rosella is ordinarily considered a deep- 
sea sponge and its discovery in shallow water was an interesting 
fact. This, he said, is the first record of it from Californian waters. 
The following papers were presented by title : 
AN INTERESTING PALEOZOIC COCKROACH FAUNA AT 
RICHMOND, OHIO. 
BY SAMUEL H. SCUDDER. 
Since the publication of my paper on paleozoic cockroaches 
(Mem. Bost. Soc. Nat. Hist., hi, 23-134), a considerable number 
of new forms have been found and referred to me for study by dif- 
ferent parties in different parts of the country. Most of them have 
come in a scattered way, but in two instances very considerable 
