66 Bulletin, Vanderhilt Marine Museum, Vol. II 



posed triangles ; the ehelipeds and legs are reddish orange, the spines 

 of the rostrum and legs very red, the fingers of the chelae blue to 

 purple. 



Technical description: Carapace triangular, longer than broad, 

 smooth, not at all, or in old specimens, very slightly pubescent. Ros- 

 trum very slender, flattened, horizontal, tapering gently to an acumi- 

 nate point, varying in length from one and one-quarter to two and 

 three-quarters times the length of the carapace; the lateral spinules 

 of the rostrum point obliquely forward. There is no spine at the dis- 

 tal end of the basal antennal article, which fact separates the present 

 species from 8. dehilis S. I. Smith, the West Coast form, but there is 

 present in seticornis at the middle of the basal antennal article a 

 strong spine pointing downward and forward. The abdomen in the 

 male is tapering, somewhat T-shaped, six-segmented, while in the 

 female it is broadly ovate, covering the sternal plastron between the 

 legs, convex and seven-segmented. The male ehelipeds have the palm 

 from two to nearly four times as long as the fingers; the distal half 

 of the palm and basal half of the fingers is furry. The ehelipeds and 

 legs are very long, slender, finely spinulose and also armed ; there are 

 two rows of spines of the merus and several similar spines on the 

 carpus. 



Synonymy. — Oost-Indische Zee Krabhe Slabber, Naturkundige Ver- 

 lustigingen, Haarlem, p. 162, pi. 18, fig. 2, 1778. 



Arana Parra, Descripcion de diferentes piezas de historia natural, p. 

 162, pi. 56, fig. 3, 1787. 



Cancer seticornis Herbst, Natur. Krabben u. Krebse, vol. 1, p. 229, 

 pi. 16, fig. 91 (after Slabber) ; vol. 3, part 3, p. 27, pi. 55, fig. 2, 

 1803.— Olivier, Encyc. Meth. Hist. Nat. Entom., vol. 6, p. 178, 

 1791. 



Cancer Sagittarius Fabricius, Entom. Syst. emend, et auct., vol. 2, p. 

 442 (part), 1793. 



Inachus Sagittarius Fabricius, Suppl. Ent. Syst., p. 359, 1798. 



Cancer Sagittarius Turton, Linn. Syst. Nat., vol. 3, p. 738, 1800. 



Maja Sagittarius Bosc, Hist. Nat. Crust., vol. 1, p. 253, 1802. 



Maja seticornis Bosc, ibid., p. 255, pi. 7, fig. 2 (after Slabber), 1802. 



Macropus seticornis Latreille, Hist. Nat. Crust., vol. 6, p. Ill, pi. 49, 

 fig. 3 (after Slabber), 1803. 



Macropus Sagittarius Latreille, ibid, p. 112. 



