RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN 



25 



with nine-jointed ovigers. The remaining three are young ones, probably 

 also females, with ovigers not yet fully developed, seven- or eight-jointed ; 

 the genital pores indistinct. It is evident therefore, that the normal number 

 of joints of the female ovigers is reached only in a very late stage. 

 Although many females of other species are described as having likewise 

 but seven- or eight-jointed ovigers, it may be asked if they were all 

 truly adult specimens. And, when looked at in the proper light, is it not 

 better to consider those seven- or eight-jointed ovigers as not being full- 

 grown ; and not as the result of coalescence ? 



The type of Pallenopsis (Rigona) aculeata n. sp. resembles Phoxichi- 

 lidium obliquum of Lyttelton Harbour, New Zealand, and perhaps ampler 

 researches may prove them to be synonyms. But Thomson assures: „The 



ovigerous legs are about 10 mm. long The legs of the 3rd pair 



are 31 mm. long." And as the feet are furnished with few spines only, 

 and the four eyes are of one and the same size, I have not ventured 

 for the present to identify the two species. 



List of papers referred to: 



Böhm, Pycnogoniden Museum Berlin (Gazelle), in: Acad. Berlin, 



Monatshefte, 1879, p. 170. 

 Bouvier, Pycnogonides du „Pourquoi pas"? Deuxième Expédition 



Antarctique Française, 1913, p. 107. 

 Caiman, Pycnogonida, British Antarctic („Terra Nova") Expedition, 



1915, p. 41. 

 Carpenter, Pycnogonida, Percy Sladen Trust Exp. in: Trans. Linn. Soc. 



London, V. 12, 1907, p. 95. 

 Carpenter, Pycnogonida of the Red Sea, in: Journ. Linn. Soc. V. 31, 



1910, p. 256. 

 Hodgson, Pycnogonida, National Antarctic Expedition (Discovery), 1907. 



— Pycnogonida, Scottish Antarctic Expedition (Scotia), 1908. 



Hoek, Pycnogonida, Challenger Report, 1881. 



Kröyer, Bidrag til kundskab om Pycnogoniderne, in : Nat. Hist. Tidsskr. 



N. R. Yol. 1. 1845, p. 90. 

 Latreille, Nouveau Dictionnaire d'Histoire naturelle, 1804, Yol. 24, p. 137. 



— idem, nouvelle édition, 1818, Yol. 26, p. 14. 



Loman, Siboga-Expedition, Monogr. 40, die Pantopoden, 1908, p. 65. 



— Japanische Podosomata, in : Abh. math.-phys. Cl. K. Bayr. 

 Acad. 2. Suppl. Bd., 4. Abhandlung, 1911, p. 13. 



— Les Pycnogonides et les règles de la nomenclature zoologique, 

 in: Tijdschr. Ned. Dierk. Yer. (2), Yol. 14, 1915, p. 187. 



