MUSEUM OF COMPARATIVE ZOOLOGY. 19 



It has been stated by some authors that Savigny's name was j^rgyope 

 or Argyopes, and hence not synonymous with Argiope, Desl. ; but this is an 

 error, which a reference to Thorell's paper, or to the original work of 

 Savigny, will enable any one to correct. 



Subgenus CISTELLA Gray. 



Cisiella Gray, B. M. Cat., p. 114, January, 1853. — Dall, 1. c. p. 145. 



Zellania Moore, Proc. Som. Arch. Nat. Hist. Soc, 1854. 



Shell with a single submarginal septum and bilobed loop. Surface 

 smooth or radiately ribbed. Brachia deeply emarginated by the septum. 

 Cardinal process absent or inconspicuous. 



Type Cistella cuneuta Eisso sp., 1826. 

 Habitat : living in the Mediterranean. 



Cistella {1 Schrammi var.) rubrotincta. 



?? Argiope Schrammi (var.) Crosse and Fischer, Journ. de Conchyl., XIV 

 (3 me Ser. VI), p. 269, pi. viii, fig. 6, 1866.= Cistella Schrammi Dall, 

 Am. Journ. Conch., VI, p. 146, 1870. 



West of Tortugas, 30 to 43 fathoms, January 14, 1869, Pourtales. 

 Guadaloupe, W. I., 200 to 250 fathoms, Crosse and Fischer. 



Shell small, semicircular, with the area at right angles to the plane of 

 the ha?mal (dorsal) valve. Hamial valve rather flat, with about ten pale 

 yellow rather strong ribs with brilliant scarlet interspaces ; a slight depres- 

 sion externally may be noticed on the surface of the valve, and occasionally 

 an attempt at a median rib, near the margin. Interior whitish, marked 

 by the punctations which are clearly visible to the naked eye in a good 

 light. Margin smooth, except for the fimbriated appearance caused by the 

 incomplete marginal perforations which are visible as grooves under a 

 lens. Hinge line straight, without area, hinge plate, or distinct cardinal 

 process. Septum triangular, extending from the hinge margin to the ante- 

 rior border of the shell. Most elevated point, forming the apex of the 

 triangle in the middle of the valve, rather bulbous and of a red color. 

 Anterior slope of the septum to the border of the shell, straight without 

 nodules ; this part of the septum is thin and even. Posterior slope of the 

 septum irregularly concave, thick, and nodulous, tapering to a point at the 

 hinge margin. On either side of the septum below its apex, is a transverse 

 wing or plate at right angles to the septum, of a thick nodulous form, the 

 two wings, taken together, presenting a heart-shaped plate with the broad 

 end downward. These extensions, however, are not confluent with the 

 valve, except close in by the base of the septum. Apophyses attached to 

 the hinge margin, provided with rather broad crura pointing toward each 

 other horizontally ; the lower edges of the laeunae of the apophyses con- 



