. Natural history. Geology; Zoology; Botany. 22 Sm CHAELES ELIOT. larger than the line of the cerata, and the reddish ramifications are clearly visible through the skin. The diverticula within the cerata, on the other hand, are only visible with difficulty, being of the same colour as the integuments as preserved. In structure they are similar to the same organs in N. Pig. ii.—Notaeolidia depressa—a First Lateeal Tooth; b Secohb; c Third; d Fourth. The reproductive system is not much developed, and the animal, considering its relatively small size, is probably sexually immature. The fo
. Natural history. Geology; Zoology; Botany. 22 Sm CHAELES ELIOT. larger than the line of the cerata, and the reddish ramifications are clearly visible through the skin. The diverticula within the cerata, on the other hand, are only visible with difficulty, being of the same colour as the integuments as preserved. In structure they are similar to the same organs in N. Pig. ii.—Notaeolidia depressa—a First Lateeal Tooth; b Secohb; c Third; d Fourth. The reproductive system is not much developed, and the animal, considering its relatively small size, is probably sexually immature. The follicles of the hermaphrodite gland lie among the hepatic branches, but do not form a thick mass above them, as in N. gigas. The anterior genital mass is small and yellow, the spermatotheca of moderate size and roundish, the vas deferens long and muqh convoluted. CRATENIDAE. (See Eliot, Jour. Mar. Biol. Assoc, VII. (1906), pp. 363-366.) The division into genera of the forms comprised in Dr. Bergh's family Cratenidae is a matter of great difficulty. Phestilla is distinguished by its dentition among other points, and Hervia by its elongate shape; but Cuthona, Cuthonella, and Cratena are not easily separated from one another. None of thiem have any very remarkable characteristics; they are smallish ^Eolids, neither very long nor very stout, with simple rhinophores, cylindrical cerata, a foot rounded in front or with inconspicuous projections, and teeth of the common horse-shoe shape, bearing a moderate number of denticles (usually less than twelve) on each side of a central cusp. In Jeffreys' " British Conchology," Vol. V., Alder divided many of the forms comprised in these genera between Cuthona, having the branchiae close set, and Cavolina, having them in rather distant rows, and also having the central cusp of the teeth a little prominent. But the name Cavolina is preoccupied, and the difference between close set and distant rows is one of degree, which may be obsc
Size: 1077px × 2319px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, booksubjectzo
