v CRUSTACEALITERATURE 411 



known Erichthoid larva) partly to disappear in the 2d period and finally to re- 

 appear in their definitive form. The developmental history of the Loricata shows 

 similar phenomena. The first attempt, later frustrated, to form all or most of the 

 typical Malacostracan extremities, which we here observe is no doubt to be 

 ascribed to the force of heredity. The temporary disappearance of some of the 

 extremities is most probably a phenomenon of adaptation to the special conditions of 

 existence of the larva, so different from those of the adult. If, however, these first 

 fruitless and useless attempts were in the course of time to become gradually weaker, 

 and finally entirely cease, then we should meet in the Loricata and Stomatopoda with 

 phenomena quite similar to those in the Brachyuran development, where the 

 formation of the last 5 thoracic segments, and their extremities occurs so extra- 

 ordinarily late. In this way, also perhaps we can explain the fact that the 

 Brachyuran ambulatory feet appear in their definitive form and not as biramose 

 feet. 



Review of the most important Literature. 



Especially recommended as an introduction to the study of the Crustacea. 



T. H. Huxley. The Cray-fish: An introduction to the study of Zoology ("Inter- 

 national Scientific Series," 1884). 



Comprehensive or more general works. 



J. E. V. Boas. Studien iiber die Verwandtschaftsbeziehungen der Malacostraken, in 



Gegenbaur's Morphol. Jahrbuch. 8 Bd. 1883. 

 Justus Carriere. Die Sehorgane der Tkiere, vergleichend-anatomisch daryestellt. 



Mimchen und Leipzig, 1885. 

 C. Glaus. Untersuchungen zur Erforschung der genealogischen Grundlage des 



Crustaceen-systeins. Ein Beitrag zur Descendenzlehre. "VVien, 1876. Important. 

 The same. Neue Beitrage zur Morphologic der Crustaceen, in Arb. aus dem Zool. 



Institute zu Wien. 6 Bd. 1886. 

 J. Dana. Crustacea of U. S. exploring expedition under Capt. Charles Wilkes. 2 



vols. with Atlas. Philadelphia, 1852. 

 H. Gerstaecker. Arthropoden in Bronris Klassen und Ordnungen des Thierreichs. 



5 Bd. /. Abfh. First half 1866-1879. Second half not yet completed. 

 A. Grenacher. Untersuchungen iiber das Sehorgan der Arthropoden. Gb'ttingen, 



1879. 

 Carl Grobben. Die Antennendruse der Crustaceen. Arb. aus dem Zool. Institute zu 



Wien. 3 Bd. 1880. 

 Milne Edwards. Histoire naturelle des Crustaces. Paris, 1834-1840. Vol. III. 



with Atlas. 

 Fritz Miiller. Fiir Darwin. Leipzig, 1864. 



Anatomy of single divisions. 



G. Bellonci. Sistema ncrwso e organi dei sensi dello Sphaeroma serratum, in 



Memorie Accad. Lincei. Vol. X. 1881. 

 Carl Claus. Neue Beolachtungen uber Cypridinen. Zeitschrift f. wiss.' Zoologie. 



23 Bd. 

 The same. Zur anatomie und Entwickelungsgcschichte der Copepoden, in Archiv. f. 



Naturgeschichte. 24 Jahrg. 1 Bd. 1858. 

 The same. Beitrage zur Kenntniss der EntomostraJcen (Copepoden, Esther ten}. 



Marburg, 1860. 



