1894. | NEW YORK ACADEMY OF SCIENCES. 49 
The following notes and papers were presented : 
Prof. N. L. Britton, “‘ Notes on some problems in plant evolu- 
tion.” The central position of algee was emphasized on pale- 
ontological grounds; pteridophytes suggesting an advancing 
phytum of early paleozoic origin ; bryophytes a late one. The 
origin of angiosperms becomes more obscure in the failure in 
transitional types of the plants of the Portuguese lower creta- 
ceous. 
G. N. Calkins, “A little known phenomenon in the life history 
of Stentor.” Free swimming embryos of S. ceruleus were 
noted, which were called by Biitschli (Cf. Brown, Protozoa) 
Lieberkuhnina. The observations of Claparede and Lachman 
on Stentor roeselii were thus corroborated. 
The following paper was then read : 
ADDITIONAL NOTES ON THE CLASSIFICATION OF 
LEPIDOPTEROUS LARVA. 
By Harrison G. Dyar, A. M. 
In a former communication to this Academy, I attempted to 
found a classification of lepidopterous larvee on the arrangement 
and modification of their tubercles; but I excluded from con- 
sideration the first larval stage. I propose to consider this stage 
now, and offer also a few supplementary notes. 
THE LARVAL PROLEGS. 
Prof. J. B. Smith has called my attention again to the arrange- 
ment of the crotchets on the abdominal feet of larve as classifi- 
catory characters of importance. But I do not find that they 
showas muchas the tubercles. It is characteristic of concealed 
feeders to. have the crotchets in a circle. and this structure has 
been retained in the Cossina as here defined. It has not been 
regained in those Noctuids which live concealed (e. g., Achato- 
des zex), but the character is not exclusive, since some pyralids 
have the ring incomplete (e. g., Mecyna reversalis), and the 
Drepanidz have a complete circle of crotchets.* Thus this 
*See Packard. Proc. Boston Soc. Nat. Hist., xxiy., 484 (1890). The same condition is 
found in the feet of Falcaria bilineata. 
TRANSACTIONS N. Y. ACAD. SCI., Vol. XIV., Sig. 4, Feb. 15, 1895. 
