442 Scientific Intelligence. 
(3.) That simplicity of structure which is opposed to the specialized 
or differentiated condition of superiority of type.—It is evident that the 
examples of elliptic aR Yale ass taking this term in its most compre- 
hensive sense, may include the various simplifications which mark un- 
specialized structures ot. inferior types. Yet we propose to restrict the 
term to those examples of deficiencies which are obviously connected 
with degradational or hypotypic conditions under any type. 
7. On the Embryology of Astercanthion berylinus Ag, and a species 
allied to A. rubens M. T. Asteracanthion pallidus Ag.; by A. AGassiZ. 
8 pp. 8vo., from He Proceedings of the American Academy of Arts and 
Sciences, Ap. 14, 1863.—This paper is a brief description of the embry- 
ology of the Ci inoisr, above mentioned, illustrated by two excellent 
plates. The results, it states, are to appear in full in the fifth volume of 
rof. Agassiz’s Contributions to the Natural History of the United States. 
8. List of the Echinoderms sent to different Institutions in exchange for 
other specimens with Annotations; by A. AGAssIz. pp. 17-28, 8v0.— 
The oo in this printed Catalogue are observations on character- 
istics @ species, or lo salities, references to authorities, &e. 
9. On synthetic types in Insects; by A. S. Packarp, Jr. (from the 
Jour. Bost. Soc. Nat. Hist., June, 1863, pp. ripeairneg —Mr. Packard has 
here brought together much information and some new suggestions with 
rd e analogies between the different. tribes of Insects. We 
shall take occasion to quote from his memoir in another number of this 
10. Beitrage zur Kenntniss der fosillen Pferde und zu einer vergleichenden 
Odontographie d er Hufthiere im Allgemeinen ; von Prof. L. RétiMEYER. 
1863).—Prof. Riitimeyer, of Basel, 
the author of a valuable work on the ancient Lake. habitations of Swit- 
+ 
- 
representing fossil and recent teeth of different genera and species of 
Horse, and also of other hoofed quadrupeds. 
11. Methods of Study in Natural History ; by L. Acassiz. 320 pp. 
12mo, Boston, 1863: Ticknor & Fields, —The chapters of this interesting 
volume were originally delivered as oral lectures by Prof. Agassiz, and sub- 
uently, with the exception of the last, written out in a popular form for 
the Atlantic Montlily. The author here presents his views on nomenclature 
and classification, on the nature and constancy of species as opposed to 
the aera 9 theory, on the formation of coral reefs and the length 
ical time as determined by their rate of progress, on alternate 
ml and on the ovarian egg and the relations ‘of embryology to 
classification. 
oe — the eewiiers of the Aides deh by W. K. Parker and 
ones. Part VIII, Textularia. 8 pp. 0 (8 Ann. and Mag. Nat. 
Hist for Feb. 1863).—The characteristics, aaeton of form, geographical 
ribution and generic synonymy of the Textularia group are the sub- 
jects of thie paper. 
,_' Die Fauna der Pfahlbauten in der Schweiz. Untersuchungen iiber : 
fgg” : there von foe MRL Berope. "i pp wh wed 
