258 PERCY SLADEN TRUST EXPEDITION 



This species is as flat as a Cryptopodia, but the carapace is shaped much as in 

 P. harpax. 



Female. — Carapace semi-elliptical, a little broader than long, nearly smooth. Gastric 

 and cardiac regions granulate ; an obscure, oblique ridge on the branchial region, which 

 does not reach the postero-lateral angles. Postero-lateral and posterior margins in almost 

 a transverse line. 



Margins cristiform ; no post-orbital constriction ; hepatic and branchial regions 

 separated by a deep notch ; branchial margin divided by slits into four denticulate lobes 

 in front of the rounded postero-lateral angle, and one lobe next to the posterior margin ; 

 the latter is faintly produced at the middle. Front broadly triangular, moderately 

 deflexed, edge denticulate. 



Chelipeds uneven, less than twice as long as carapace. Arm with upper surface 

 broad, bordered by denticulate teeth ; under edge denticulate. Wrist with two teeth 

 on outer edge. Right hand heavy ; both hands with outer edge bilobed, inner edge 

 of upper surface with a few small teeth, one at the middle most prominent ; inner 

 edge of hand denticulate, as also outer edge of dactylus. Legs with a few lobes 

 and spines. 



Dimensions in mm. of the type (?) : C. 1. 12"2, C. b. 137, Ch. 1. 23-3. 



241. Parthenope (Pseudolambrus) erosa (Miers) (Plate 20, fig. 11). 



Lambrus (Parthenopoides) erosus Miers, Ann. Mag. Nat. Hist. (5), iv. 1879, p. 25, 

 pi. 5, fig. 8. 



Peros, Coin ; 1 $. Coetivy ; 1 juv. 



Carapace not much broader than long, posterior half rectangular, the postero-lateral 

 margins transverse and a little in advance of the transverse posterior margin ; postero- 

 lateral angles a little produced sideways ; sides of branchial region nearly perpendicular, 

 the margins barely visible in dorsal view ; hepatic regions slightly projecting. Front and 

 anterior gastric region deflexed ; edge of front subtruncate, sides concave. Surface 

 regularly pitted and eroded, the largest depressions bounding the cardiac and posterior 

 gastric regions. The elevated portions are covered with confluent stellar granules, and 

 similar isolated granules are numerous in the depressions. Under surface of body similarly 

 pitted. 



Chelipeds short and very stout, rough with granules like the carapace, but without 

 pits except near the proximal end ; a dentiform tubercle on upper surface of arm ; inner 

 margin of upper surface of palm crenated, most prominent at middle ; immovable finger 

 half as wide again as long. Legs stout, reticulated with pits, except the dactyli, armed 

 with acorn-shaped spines. 



Dimensions of $ in mm. : C. 1. 15'2, C. b. 187, C. b. between postero-lateral angles 

 18-4, Ch. 1. (right or larger) 19 -6, H. 1. 8-8, H. b. 8-2. 



In the young (C. 1. 5"3 mm., C. b. 6'2 mm.) the carapace and chelipeds are everywhere 

 covered with small cavities separated by narrow reticulating lines. 





