THE KEEVOUS SYSTEM OP THE MOLLUSCA. 185 



epithelial cell sometimes takes up the blue coloration ia a 

 marked manner, while its fellows remain unstained. 



It remains but to state as a result obtained with, the rhinopliore, 

 that there is an arrangement of ganglionic cells somewhat 

 similar to that of tlie osphradium . Although none of the prepa- 

 rations (for reasons already stated) showed many details, a few 

 sensory cells were observed. 



I Lope thus to have shown that the methylene-blue method 

 can be satisfactorily applied to the study of the nervous system 

 of at least some of the Mollusca. 



As these notes are merely a first report of the results of a par- 

 ticular application of a method, it has not been deemed necessary 

 to discuss them at any length, or to give a detailed account of 

 the work of others in the same field. I append references, 

 however, to some of the more important works wliich contain 

 full bibliographies beyond those alluded to in the text, 



1. Boll, F. — " Beitrage zur vergleichenden Histologie des 



MoUuskentypus." Archiv f. mikr. Auat,, SuppL-Heft zu 

 Bd. v., 1869. 



2. Plemming-, W. — " Die Haartragende Sinneszellen in der ober- 



haut der Mollusken." Archiv f, mikr. Anat., Bd. v,, 1869, 

 & Bd. vi., 1870. 



3. Hallee, Bela. — " Untersuchungen iiber marine Ehipido- 



glossen," Morph. Jahrb,, Bd. ix., 1883. 



4. Deost, K. — "Ueber das Nervensystem und die Sinnes- 



epithelien der Herzmuschel." Inaugural Dissertation. 

 Kiel, 1886. 



5. Bebkaed, p. — " Becherches sur les Organes palleaux des 



Prosobranches." Ann. Sei. Zool. Nat. (7) ix., 1890. 



6. Eetzius, Gr. — " Biologische Untersuchungen," Bd. iv,, 1892. 



7. JouBiJsr, L, — " liecherches sur la Coloration du Tegument 



chez les Cephalopodes," Archiv. de Zool. Exper. (8) Tm. x. 

 p, 277, 1892. 



8. Samassa, p. — " Ueber die Nerven des Augentragenden 



Piiblers von Helix pom at ia." Zool. Jahrb. (Spengel), Abth. 

 f. Anat. und Out., Bd. vii., Heft 3, 1893. 



9. Mazzaeelli, G. — " Monografia delle AplysiidcB del Grolfo di 



Napoli." Mem. Soc. Ital. ix. (1893). 



10. Nabias, B. de. — " Hecherches histologiques et organologiques 



sur les centres nerveux des Grasteropodes (JPulmonata)'^ 

 Act. Soc, Bordeaux, Tm. xlvii. pp. 11-202. 



