On the visual organs in Lamellibranchiata / by Benjamin Sharp.

  • Sharp, Benjamin, 1877-1916.
Date:
[1883]
Catalogue details

Licence: Public Domain Mark

Credit: On the visual organs in Lamellibranchiata / by Benjamin Sharp. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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    A. Krohn's1 account is much fuller as to anatomy of the eye of Pecten and goes far ahead of that of any of his predecessors. He was the first to point out the existence of two nerves passing to the eyeball, these two being the splitting of the main nerve in the pedicle of the eye. In 1844 Will2 investigated a number of Lamellibranchiata and found that a great many of them possessed eyes of great complexity. I have, unfortunately, been unable to consult the original article and know it only through Troschel's Jahresbericht for 18443, and what subsequent authors have quoted or made reference to. C. Th. v. Siebold in his Comparative Anatomy of the Inverte- brata* sustains the observations of Will. It is here said that the eyes of Pholas, Solen, Venus and Mactra are not on pedicles, but situated at the bases of the tentacles. In Car- dium there is an extremely large number of contractile pedicles on the ends of which are the eyes; Tellina has the edges of the mantle set with small pedunculated eyes of a reddish yellow color; Pinna has on the anterior mantle edge forty short pedunculated yellowish brown eyes, while in Area and Pectunculus are a large number of brownish red ones; Anomia, a form not investigated by Will, has twenty brown sessile eyes situated between the numerous tentacles; in Ostrea the visual organs are the most numerous, and the most distinct eyes are found in Pecten. M. Duvernoy 5 in 1852 gave a short description of the eye [of Pecten maximus, but advanced nothing new on this head and did not enter into the histology at all. ; 1 A-k*ohn, tiber augenahnliche Organe bei Pecten und Spondylus. Mul- ler s Archiv fur Anat. und Physiol. Berlin 1840. p. 371 ff. 2 Will, tiber die Augen der Bivalven und Ascidien. Froriep's Neue Noti- zen a. d. Gebiete der Natur- und Heilkunde. Bd. XXIX. Weirnar 1844 n 81 und p. 99. . * p' 3 ArchivfurNaturgeschichte. Xl.Jahrg. Bd.II. Berlin 1845. p. 297: »Will stellte Untersuchungen iiber die Augen der Muscheln an. Er fand dieselben sehr hoch organist Aufier bei Pecten, Spondylus, Ostrea fand sie derselbe auch bei Anna, Area, Pectunculus, Mytilm, Cardium, Tellina, Mactra, Venus, Solen Pho- las zuweilem m ungeheurer Zahl. Auch bei den Ascidien Cynthia, Fhallusia und Clavelhna wurden Augen nachgewiesen, und zwar 14, von denen 8 der Athem- und 6 der Afterrohre angehoren.« , TH'bV- f-T,?' Lo?rbUCh der ™*Wchenden Anatomic der wirbel- losen Thiere. Berlin 1848. p. 262 u. 263. wuuli « Mi Duvernoy, Mdmoire sur le Systeme Nerveux des Mollusqnos Ao6pha- Tom]Sot $m!v> ns de rAcad-desSc-derln8t-deF,ace- Mittheilungen a. d. Zoolog. Station zu Neapel. Bd. V. 30