Nature of Vision in the Invertebrate Animals 317 



No. 49. Errones. I have seen intermediate specimens wliich 

 completely connect the C ovum of Gmelin with this species. 



No. 61. Obvelata. Is the C.prtssa of Solander, and was first 

 brought by hira from Otaheite. 



No. 65. Angustuta. The C maciilata of Perry, t. 20. f. 5. is 

 most probably intended for this species. 



No. 67. Piperita. In Dr. Solander's MS. at the Banksiau 

 Library, no mention is made of any species with this name. 



No. 70. To this species the following Syuonymes may be added, 

 Indian speckled Starling Cowry. Pctiver, t. 80. f. 9. 

 Cypra?a No. 43. Schroetcr Einleitung, i. p. 146. 

 Cypraea arenosa. Solander''s MS. 

 Cypraea ovata. Perry ^ t. 21. f. 3. 

 No. 72. Flaveola. The shell here described accords badly 

 with the description in INIus. Lud. Ulr. p. 581. See note on 

 No. 35. 



No. 77. Listen. Is the C. marginulis of Solander's jNIS. and 

 of the Portland Cataloiiue. 



NATURE OF VISION IN THE INVERTEBRATE ANIMALS. 



The following passage, concluding with a remark on the probable 

 nature of vision in insects, is extracted from the " General staie- 

 vient oj the iindulatorij theory of Light ^''^ in the article "Ligut," 

 by Mr. Ilerschel, published in Part XX of the Encyclopasdia Mc- 

 tropolitana, which appeared in April last. It is submitted to the 

 readers of the Zoological Journal, in support of a hypothetical 

 suggestion respecting the vision of certain groups of Mollusca and 

 Annelida^ contained in a paper " On certain organs of the Jlelic/dce 

 usually regarded as their eyes," printed in vol. ii., p. 497, which 

 some scientific friends of the authour have been disposed to regard 

 as improbable. In that suggestion, however, the same idea M'as 

 proposed on the nature of vision in the Mollusca and Annelida, ia 

 a general and perhaps an obscure manner, which Mr. Ilerschel, 

 with beautiful precision and particularity, has expressed on the 

 vision of Insects. 



