Teleosts with a conus arteriosus having more than one row of valves / by Harold D. Senior.

  • Senior, Harold D.
Date:
1907
Catalogue details

Licence: In copyright

Credit: Teleosts with a conus arteriosus having more than one row of valves / by Harold D. Senior. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    Proceedings of the Association of American Anatomists which IS not so dilated as is usual in teleosts, very slightly oyerlaps the adjacent portion of the conus. The conus yahes are arranged in two tiers, each tier haying a right and e t cusp meeting, when in apposition, at the mid-sagittal iilane. The accompanying figure, showing the yentral surface of a frontal section 10) passing through the middle of the yahes, indicates the general relations of the conus. The jirodigious depth of the distal cusps as compared to the shallower correspond- ing cusps of Albula, i\[egalo]>s, and Tarpon, is the most remarkable feature in this heart, and strongly reminds one of the deep distal cusps in Amia. The conus is pro])ortionately longer in Pteroth- rissus than in any other form of teleost. The ayerage length of conus as compared with yentricle (measured from the ape.x to the root of conus) is as 1 to 3.5. In Megalops this proportion is 1 to 4 (judging from the figures giyen by Boaz the pro- portion is about the same or slightly less in Al- bula) ; in Tarpon the proportion is 1 to 4-5. The atrio-yentricular yalye in Pterothrissus is the conus arteriosus Ulidline and has four in Pterothrissus. cusps.