MUSEUM OF COMPAKATIVE ZOOLOGY. 203 



Family MEGATHYRID^. 



Genus MEGATHYRIS D'Orbignt. 



Subgenus CISTELLA Gray. 



Cistella Baxrettiana Davidson, var. rubrotincta Dall. 



Cistella Barrettiana Dall, Bull. M. C. Z., IX. pp. 103, 104. 



Argiope Barrettiana Davidson, P. Z. S., Feb. 1866, p. 103, pi. xii. fig. 3. 



Argiope antiUarum Crosse & Fischer, Journ. de Cbnchyl., XIV., July, 1866, p. 270, 



pi. viii. fig. 6. 

 Cistella (Schrammi var. 1) rubrotincta Dall, Bull. M. C. Z., III. p. 19, pi. i. fig. 6, 1874. 



Habitat. Sand Key, 80 fms. ; Station 2, 805 fms.; Yucatan Strait, 640 

 fins. ; Station 45, 101 fms.; Station 20, 220 fnis, ; Barbados, 100 fms.; Sigs- 

 bee, off Havana, 450 fms. ; Station 276, 94 fms. ; Station 231, St. Vincent, 95 

 fms. ; Tortugas, 43 fms.; Station 297, 170 fms., off Grenada; Station 132, 115 

 fms., Santa Cruz ; Station 155, 88 fms., near Montserrat, W. I. 



Tbis pretty little species bas about the same range in depth and temperature 

 as T. Cailleti. The above s;ynionymy represents the conclusions of Mr. David- 

 son and myself, after several years of correspondence and the study of quite 

 abundant material. 



Cistella (Barrettiana var.?) Schrammi Crosse & Fischer. 



Cistella {Barrettiana (?) var.) Schrammi, Bull. M. C. Z., IX. p. 104. 

 Argiope Schrammi, Crosse & Fischer, 1. c, p. 269, pi. viii. fig. 6, 1866. 



Habitat. Station 45, 101 fms. ; Barbados, 100 fms. 



There is much doubt as to the distinctness of this form from C. Barrettiana, 

 which seems very variable in sculpture and color. 



Cistella lutea Dall. 



Cistella lutea Dall, Bull. M. C. Z., III. p. 20, pi. i. fig. 5, pi. ii. figs. 4-8, 1871 ; 



Ibid., IX. p. 103. 



Habitat. Sig-*bee, off Havana, 80 to 127 fms. ; Barbados, 100 fms. ; Station 

 21, 287 fms. ; Tortugas, 30 fms. 



Owing to the differences in the form of the shell and especially of the sep- 

 tum, Mr. Davidson was inclined to regard this as a valid species, and so stated 

 in his last communication on this subject. Jt^may, however, be only an 

 extreme form of Barrettiana, though intermediate specimens are still wanting. 



