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SUPPLEMENT TO THE BRITISH 



the species) unusual development of its teeth, also the large size of the perforations of its 

 shell-tissue, form other good distinguishing characters. We must not, however, for the 

 present, assume that no calcareous support in reality exists." 



Mr. Jeffreys differed from Prof. King with respect to the generic position of this 

 species, and referred it to the genus Argiope ; but I cannot help observing that in all the 

 species of Argiope that have fallen under my observation a loop and septum or septa were 

 present and visible, and for this reason I scarcely think we should be justified in placing 

 it into Deslongchamp's well-characterised genus. 



G. capsula is almost circular, or slightly elongated oval, nearly equivalved; beak 

 slightly prominent ; foramen triangular and large ; shell thin, perforations rather large 

 and far apart. 



Mr. Jeffreys gives us the following habitats : — 18 to 25 fathoms, Plymouth (Norman 

 and Webster) ; Guernsey (Lukis) ; Dublin Bay and Portsmouth (Waller) ; Larne, Co. 

 Antrim (Hyndman and Jeffreys). M. Colbeau obtained it from Sluys-Kill, Zelande, near 

 the Belgian frontier. It occurs also fossil in the Post-Tertiary clays at Kirkoen, near 

 Chris tiania (Sars). 



9. Argiope cistellula, Wood. Dav., Tert. Mon., PI. I, fig. 2. 



Megathyris cistellula, Forbes and Hanley. Hist, of Br. .Moll., pi. lvii, fig. 9, 1849. 

 Cistella cistellula, Dav. Am. Journ. of Conch., vol. vi, 18/0. 

 Argiope cistellula, Jeffreys. Br. Conch., vol. ii, p. 19, pi. i, fig. 2. 



In the British Museum Catalogue of the Mollusca, partiv, p. 114, Dr. Gray proposed 

 to divide the genus Argiope into two sections ; that the name Argiope should be retained 

 for those species the dorsal valve of which is interiorly provided with three or five 

 radiating sub-marginal septa, and a four-lobed loop attached to the septa; while the 

 name Cistella be given to those species such as the one under description, A. Neapolitana, 

 &c, where there exists a single median sub-marginal septum and bilobed loop. M. 

 Dall proposes that D'Orbigny's name Megathyris should be substituted for that of 

 Argiope, the last name having been given by Savigny and Audouinin 1827 to a genus of 

 Egyptian spiders. 



At one time Mr. Jeffreys suggested that A. cistellula should be A. lunifera, Phillipi, 

 but there seems to exist so much uncertainty with reference to Philippics so-termed species 

 that it will be advisable to retain Mr. J. Wood's name for the shell under description. 

 I am glad to be able to state that Mr. Jeffreys now agrees to this arrangement, because 

 it is evident to him that Philippi has confounded two species in his figures of T. lunifera. 

 The smaller one probably is referable to the shell named cistellula by Wood, while the 

 larger specimen belongs to another species. 



