. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. OPHIOLEPIDAE 309 is very inconstant, sometimes four or five as shown by Koehler, sometimes only one or two, and examples of both may be found in one and the same specimen in different radii. The granules of the disk may continue between the first dorsal plates. In the larger specimens there may be as many as seven to eight arm spines. The species has separate sexes and appears not to be viviparous. This species bears a very close resemblance to Ophiogona laevigata from Kerguelen, described by St
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. OPHIOLEPIDAE 309 is very inconstant, sometimes four or five as shown by Koehler, sometimes only one or two, and examples of both may be found in one and the same specimen in different radii. The granules of the disk may continue between the first dorsal plates. In the larger specimens there may be as many as seven to eight arm spines. The species has separate sexes and appears not to be viviparous. This species bears a very close resemblance to Ophiogona laevigata from Kerguelen, described by Studer (Vbersicht ilber die Ophiiiriden 'Gazelle'. Abh. Fig. 34. Ophiogona Doderleini (Koehler). Part of oral side {a) and dorsal side {b). X 10. Berlin, 1882, p. 6, Taf. i, figs. 2 a-c). From the description and figures given by Studer I cannot gather any other difference than that in O. laevigata the radial shields are covered by granules, these being naked in the present species, and as this may quite probably be a difference due to age, the type of O. laevigata being no less than 40 mm. in diameter of disk (thus twice the size of the largest known specimens of O. Doderleini), this character alone does not justify us in regarding them as two distinct species. On application for the loan of the type material of O. laevigata, Professor W. Arndt of the Berlin Museum very kindly sent me a large specimen, 33 mm. in diameter, for comparison with my specimens. The only difference I can find is in the papillae of the first tentacle pore. As shown in Fig. 35 the papillae on the adradial side of the pore join in the radial mid-line, being all of them attached to the ventral plate itself; in O. Doderleini the ^'g- 35- Ophiogona laevigata, adradial papillae of the first tentacle pore do not join in the ^'"'^''â - ^^" °^ '"°"'^"' 'â¢^°*- J. , . J ,. , , . , . ing the arrangement of the radial mid-hne, the two or three mner ones bemg attach
Size: 2161px × 1157px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
