1j4 CALIFORNIA ACADEMY OF SCIENCES. 



body cavity is viewed from the interior .surface. It is attaclied to the at this point 

 very much thickened body-wall (fig. lo8) by numerous muscles and connective 

 tissue. Tlic various species of Ocnerodrilus, especially tho.se with short prostates, 

 require reinvestigation in order to ascertain the .structure of the prostates. Should 

 intermediate forms l)e found it might become proper to merge the two genera into one. 

 Ne/)hrldia. Tho.se anterior to clitL'lhiiu are not covered with a co'lomic cell 

 mantle, while those posterior to the clitelUini are surrounded by a very thick one. 

 The structure of the nephridia appears to be similar to those of Phobnicodrilus taste, 

 at least in a general way. 



LITERATURE REFERRED TO. 



Bexham, W. B. A uew English Geuus of Aquatic Oligochteta (Sparganophilus), belonging to the family of Rhino- 



drilida?. Quarterly Jourual Micros. Science, vol. xxxiv. 

 Beniiam, W. B. Report on an Earthworm collected for the Nat. Hist. Dept. of British Museum by Emin Pasha in 



East Africa. Journal Roy. Microsc. Society, February, 1891. 

 Beddard, Fb. E. Two New Genera, Comprising Three New Species of Earthworms from Western Tropical Africa. 



I'roccedings Zoological Society, 1894, pages 379, etc. 

 Beddaki), Fr. E. a Monograph of the Order of Oligochivta. Oxford, 1895. 



Cerkontaine, p. Eecherchcs sur le Systeme Cutane, etc., du Lombric Terrestre. Archives de Biologie, x, 1890. 

 EiSEN, G. California Eudrilidu-. Memoirs Gal. Academy of Sciences, vol. ii. No. 3. 

 ElSEN, O. Pacific Coast Oligochatn I. Memoirs Cal. Acad, of Sciences, vol. ii. No. 4. 

 EiSEN, G. Anatomical Studies on New Species of Ocnerodrilus. Proceedings Cal. Academy of Sciences, ser. 2, 



vol. ill. 

 Garman, H. On the Anatomy and History of a New Earthworm (Diplocardia communis). Illinois State Labora- 

 tory of Nat. History, iii, 1888. 

 Hesse, Richard. Uber the Scptnldriisen der Oligochajten. Zoological Anzeiger, No. 456, 1894. 

 Hesse, Richard. Zur Vergleichendc Anatomie der Oligocha'ten. ZeitscUrift f. Wissensch. Zoologie, 1894, pages 



406. 

 HoKST, R. Earthworms from the Malay Archipelago. Zoolog. Ergebn. e. Reise in Niederland. Ost-Indien. Dr. 



Max Weber, B. ii, Leiden, 1892. 

 Lanudon, F. E. Sense Organs of Lumbricus. .luurnal of Morphology, vol. xi. 

 MiCHAEUSEN, W. Oligochajten des Nat. Hist. Museum, Hamburg, iii. 

 Michael-sen, W. Oligochneten des Nat. Hist. Museum, Hamburg, No. iv. 

 MicHAEi.sEN, W. RegenwUrmer der Thicrwelt Ost-Afrikas, Bd. iv, Berlin, 1895. 

 Rosa, Dr. D. Annalleu d. K. K. Nat. Hist. Hofmuseums. Die Exotischeu Terricoleu, Wien, 1891. 

 Rosa, Dr. D. Contributo alio Studio dei Terricoli Neotropicali. Accademia Reale dcUc Scienze di Torino, 1895. 

 Smith, Frank. A Preliminary Account of Two New 01igocha>ta from Illinois. Bulletin Illinois State Laboratory 



of Nat. History, vol. iv, 1895. 

 Ui>E, H. Beitr;ige zur Kentniss nusl.'UKlischer Regenwuriuer. Zeitscbr. f. Wissens. Zoologie, 57, 1894, page 69, etc. 

 Vejdovskv, Fr. Organogenic der (iordiodrilen, Zeitschr. f. Wissensch. Zoologie, Bd. Ivii, p. 642. 

 Vejdovsky, Fr. System u. Morphologie der Oligochieten, Prag., 1884. 

 Verso.v, E. von. Zur Si)ermat<>genesis, Zool. Anzeiger, xii, 1889, p. 100. 



