ANNOTATED LIST. 57 
Certonardoa squamulosa. 
Nardoa squamulosa Koehler. 1910. Indian Mus. Ast., p. 168, pl. i, fig. 8; pl. xv, figs. 7, 8. 
This species is based on a single specimen, with R =37 or 38 mm., dredged off Cape 
Negrais in 40 fathoms. Koehler himself says it is very near carinata and may prove to be 
identical with it. Fisher (1919) records two specimens from the Philippines, but even the 
larger exceeds Koehler’s type by only a trifle, so they do not throw much light on the species. 
PLENARDOA! gen. noy. 
Similar to Certonardoa in many respects, but with papule isolated and not in groups. 
It thus resembles Narcissia in the distribution of the papule, but the number and arrange- 
ment of the longitudinal series of abactinal plates precludes placing the East Indian species 
for which the genus is established, in that Atlantic group. 
Genotype: Linckia semiseriata von Martens. 
It is with no little hesitation that I establish this monotypic genus, but since von 
Martens particularly states that the papular pores are single in his L. semiseriata, the 
species can not be placed in either Nardoa or Certonardoa. On the other hand, although that 
type specimen was a small one, it has a far greater number of abactinal plates than either 
of the known species of Narcissia, and their arrangement in longitudinal series is highly 
characteristic. I see no other course open, therefore, than the formation of a new genus. 
Plenardoa semiseriata. 
Linckia semiseriata yon Martens. 1865. Arch. f. Naturg., 31, pt. 1, p. 355. 
Nardoa semiseriata Sladen. 1889. Challenger Ast., p. 412. 
This species is unfortunately known only from the holotype, in which R=39 mm. 
It was taken at 7° latitude in the South China Sea, at a depth of 40 fathoms. The color 
in alcohol was yellowish. The skeleton of each arm is made up on each side of the adam- 
bulacral plates thus: a series of actinolaterals, the inferomarginals and superomarginals, 
and 7 series of dorso-laterals, of which the 4 uppermost are larger than the 3 between them 
and the superomarginals; the median abactinal surface of the arm is covered by 3 or 4 
series of plates alternating with each other. No other linckiid has an arm structure corre- 
sponding to this. 
NARCISSIA. 
Gray. 1840. Ann. Mag. Nat. Hist., 6, p. 287. 
Genotype: Narcissia teneriffe Gray =Asterias canariensis d’Orbigny. Monotypic. 
This genus of small linckiids seems to be confined to the tropical Atlantic. It is easily 
recognized by the trigonal, tapering rays with few series of abactinal plates, and the isolated 
papule confined to the abactinal surface. Only 2 species are known and neither of these 
is at allcommon. They are distinguished as follows: 
Key to the Species of Narcissia. 
Raye lon gang sondern R19) Wes over sreyar sve raj cve sb evar a¥a) ove ist ofausiw ele. a\6ie s/s c\sps 2 00s picial steleistelevele leialelel fale tvererete te canariensis 
DV SISHOLtEK ANd) wIGOrs R= 4 — oii Teya seyret) aes a csestetareve ete cate ate ete e ete aictintel nh rove fore ebe aie: wictre a) « slore ele loveleielele el euscere trigonaria 
Narcissia canariensis. 
Asterias canariensis d’Orbigny. 1839. Voy. de Webb et Berthelot aux fles Canaries, p. 148, Echinod., pl. 1, 
figs. 8-15. 
Narcissia teneriffe. Gray. 1840. Ann. Mag. Nat. Hist., 6, p. 287. 
Scytaster (Narcissia) canariensis Perrier. 1875. Rev. Stell., Arch. Zool. Exp., 4, p. 170 (434). 
Narcissia canariensis Sladen. 1889. Challenger Ast., p. 413. 
Fromia narcissie Perrier. 1894. Trav. et Tal. Stell., p. 331. 
Although Sladen had a specimen of this little-known species, taken by the Challenger 
at the Cape Verde Islands, he gives us no details whatever with regard to it except the brief 
1 Av =beyond + Nardoa, in reference to the development of abactinal plates beyond anything known in Nardoa, 
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