A, E. Verrill — Decapod Crustacea of Bermuda. 417 



Family PARTHENOPIDiE. 



Chelipeds usually much stouter and often very mucli longer than 

 the legs. Basal joint of the anteunie narrow and small, situated 

 between the front and the bottom of the orbits. 



Parthenope* {Platylambrus) crenulata (Sans.). 



Lambnis cre'nulatus Saussure, op. cit., p. 429, pi. i, figs. 4, 4a, 1855. Stiiup- 

 son. Notes, No. ii, p. 201 fTSJ; Biilletm Mus. Comp. Zool. ii, p. 129 {Plaiy- 

 lambrus) 1870. 

 Platylambrus serratus (pars) A. M.-Edw., op. cit., p. 156, pi. xxx, figs. 1-lc, 

 1875. 



Plate XXVII, Figure 5. 



Our Bermuda specimen agrees well with Saussure's description 

 and figure, though it is much smaller. The carapace, as in his type, 

 has an elongated, acute, lateral spine on each side. It also has the 

 same form of rostrum, and agrees well in the tubercles and areola- 

 tion of the carapace and armature of the chelipeds. 



The carapace is much cut away and slightly concave behind the 

 large lateral spine, and has no posterior lateral spines or teeth, while 

 there are in front of the large, lateral spine six or seven small, 

 obtuse, nearly even antero-lateral teeth or crenulaiions, on the evenly 

 convex margin. Its rostrum is wide, and not constricted near the 

 base; the tubercles of the carapace are relatively large and obtuse; 

 five of the largest size stand in the median row, and three or four 

 in a curved row on each side on a ridge nearly parallel with the 

 convex, antero-lateral margin. 'J'he cervical constriction is ver}^ 

 marked. The under edge of the chelae has a row of minute granule- 

 like denticles. The only remaining ambulatory leg (3d) is small, 

 slender, and smooth. Most of the other characters are shown in the 

 figure. 



There is, on each side, a wide channel on the under side of the 

 carapace, as in Platylambrus (Stimp.). Stimpson himself proposed 

 that genus for !?aussure's species and another one, similar in respect 

 to the channels. This genus was adopted by A. M. -Ed wards. He 

 considered crenulatus a synonym of P. serratus, but his figure of 

 the latter does not agree with our si)ecimen. 



Saussure's type was 18"^™ in length of carapace ; breadth, Avith 

 spines, 24""™; without spines, IQ'""*. The Bermuda specimen is 8™" 



* Miss Rntlibiin has shown (Proc. Biolog. Soc. Wash., xvii, ^. 170, 1904) that 

 the genus Parthenope (Weber, 1795) was restricted by Lamarck, 1801, to the 

 type P. lunghnana (L.), and, therefore, that Pfu-^/i^nope should replace Lambrus 

 (Leach, 1814), as usually understood. 



