Boone, Crustacea, Cruises of "Eagle" and ''Ara," 1921-28 117 



has the distal margin truncate, the outer angle slightly produced, 

 right-angled, the inner distal angle emarginate ; there are two oblique 

 rows, each consisting of three denticles crossing the outer face of the 

 merus ; also one denticle near the external angle ; the palp has a spine 

 at the outer distal angle of the first and second articles. 



The eye is small, well hooded, with a calcareous, tongue-like pro- 

 jection bearing an upstanding spine on the upper surface. 



The female ehelipeds are approximately two and one-half times as 

 the maximum width of the body, very slender and granulose; the 

 merus has three rows of longitudinally placed spines on the upper 

 surface, one each on the inner and outer lateral margins, and the 

 third row medially at the summit of the upper surface ; the carpus is 

 short, spinose on its outer lateral and distal margins; the propodus, 

 exclusive of the finger, is as long as the merus, with the outer and 

 inner lateral margins each armed with a series of unequal serrate 

 teeth, thirteen on the upper, fourteen on the lower, the upper surface 

 between bears a number of granules and two or three irregularly 

 placed spines; the under margin of both merus and propodus is 

 finely denticulate ; the fingers are one-third the length of the palm, 

 deflected, both with the cutting edges coarsely denticulate ; the upper 

 finger bears on its proximal portion two convergent rows of spines 

 which unite to form one line distally. The male ehelipeds are said to 

 be three to four times as long as the body. 



The ambulatories are very slender and long, smooth, except for 

 faint indications of spinules on the anterior margin of the merus. 



Synonymy. — Lamhrus agonus Stimpson, Bull. Mus. Comp. ZooL, vol. 

 2, p. 131, 1871. — A. Milne Edwakds, Crust. Reg. Mexico, p. 151, 

 pi. 28, figs. 3-3c, 1878, atlas, 1879.— Rathbun, BuU. U. S. Nat. 

 Mus., p. 513, pi. 178 and 179, pi. 275, figs. 1-3, text fig. 146, 1925. 



Subgenus: PLATYLAMBRUS Stimpson. 



Parthenope (Platylambrus) serrata (H. Milne Edwards). 



Plate 36, figs. A and B. 



Diagnostic chaeacters: Carapace triangular, flattish, anterolat- 

 eral margins convex, with 7 or 8 teeth ; a strong, outpointing lateral 

 spine, ehelipeds extremely long, flattish, serrate margins (see below). 



Type : This type is deposited in the Paris Museum, with the label : 

 "I'ocean Indien." The maps of that period occasionally referred to 



