140 



Rostrum 3-times as long as carapace, sixth abdominal somite 



3-times as long as high Richardi (Cout.) 



(H. COUTIÈRE, in: Bulletin du Musée Océanographique de Monaco, N" 48, 1905, 

 p. 18, Fig. 6, 1— 13.) 



d„ Third abdominal tergum unarmed. 



e x Upper margin of rostrum with 17 teeth, ofwhich the proximal 



are not considerably larger than the distal miles (A. M.-Edw.) 



(A. Milne-Edwards, Recueil de Figures de Crustacés nouveaux ou peu connus, 

 1S83, PI. 18.) 



e. Upper margin of rostrum with 20 — 38 teeth, of which two 

 or three proximal ones, above the eyes, are considerably 



larger than the distal ones Narwal (Heller) 



(C. Heller, Die Crustaceen des südlichen Europa. Wien 1863, p. 245, Taf. VIII, 

 fig. 7, 8.) 



b. Upper margin of rostrum finely and evenly serrate with small, 



closely packed, imbricate teeth. 



c y At the posterior sixth of carapace a small, blunt, median spine. 



Rostrum twice as long as the carapace, nearly horizontal. Upper 



margin with about 40 small spines, that are larger posteriorly 



than anteriorly. Terminal and penultimate joint of external 



maxillipeds subequal longicatida (Rathb.) 



(M. J. Rathbun, The Brachyura and Macrura of Porto Rico, Wash. 1901, p. 117, 

 fig. 24.) 



c„ No spine at the posterior sixth of carapace. 



d x Endopodite of external maxillipeds resembling that of Pandalns 



Montagui Leach, in which species the penultimate joint is 



shorter than the ultimate. 



Rostrum much longer than carapace, upper margin with 60 



teeth, the i st at one-fifth the length of the carapace from 



the orbital margin. Legs very long and slender .... escatilis (Stimpson) 

 (W. Stimpson, in: Proc. Acad. Nat. Sciences of Philadelphia, 1860, p. 37.) 



d. 2 Penultimate joint of endopodite of external maxillipeds distinctly 

 longer than ultimate. 

 c\ Carpus of 5 th leg one and a half as long as the propodus. 



Dactyli of the three posterior legs long and slender. . . stylopus (A. M.-Edw. 



(A. Milne-Edwards, Recueil de Figures de Crustacés nouveaux ou peu connus, 

 1883, PI. 19.) 



e 2 Carpus of 5 th leg shorter than propodus. 



f l Minimum thickness of 6 th abdominal somite, when looked 



at dorsally, two-fifths the length of this somite, height 



of 6 th somite anteriorly almost five-eighths the length, 



telson in full-grown specimens almost one and a half 



as long as 5" 1 somite spinipes (Bate) 



