2 1 8 NATURALISTS' ASSISTANT. 



Pourtales, L. F. de. American Sipunculids. (Proc. Am. 

 Assoc., 1851.) 



Quatrefages, A. de. History of the Annelida and 

 Gephyrea. 3 vols., 8vo, 20 pis. Paris, 1865. (Fr.) 



Rudolphi, C. Entozoorum sur Vermium Intestinum Historia 

 Naturalia. 2 vols., 8vo, 12 pis. Amsterdam, 1808-10. (Lat.) 



Rudolphi, C. Entozoorum synopsis. 8vo. Berlin. 



Savigny, J. C. Systeme des Annelides. Fol. Paris, 1820. 

 (Fr.) 



Schmarda, L. K. Neue wirbellose Thiere. (Turbellaria, Ro- 

 tatoria et Annelida). 2 pts., folio, 37 pis. Leipzig, 1859-61. 

 (Ger.) 



Schultze, M. Natural History of the Turbellaria. 4to, 7 pis. 

 Griefswald, 1851. (Ger.) 



Stimpson, W. Prodromus descriptionis animali, etc. 

 Pts. 1 &2. Turbellaria. Proc. Phil. Acad., 1857. (Lat.) 



Verrill, A. E. Synopsis of North American fresh 

 water leeches. (Rep. U. S. Fish Commission. 1872-3. 

 1874.) 



Verrill, A. E. Leeches in Report Wheeler's Surv.,v. 1875. 



Villott, A. Monograph of Gordiaclae. Arch. Zool. Exp. et 

 gen., iii. 1874. (Fr.) 



Webster, H. E. Annelida Chaetopoda of Virginia 

 Coast. (Trans. Albany Inst., ix. 1879). 



Williams, T. Report on British Annelida. 8vo, 10 pis. 

 (London), 1852. 



ECHIXODERMATA AND C(ELKNTEHATA. 



Agassiz, A. Illustrated Catalogue of North Amer- 

 ican Acalephae. (111. Cat. Mus. Comp. Zool.) 4to. Cambridge, 

 1865. 



Agassiz, A. List of Echiuoderms sent by the Museum of 

 Comp. Zoology to various Institutions. (Bulletin M. C. Z. i, 

 1863.) 



