434 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



3b. Basal article longer, almost or completely reaching 

 orbital hiatus 



6a. Afferent channels deep, bordered above by laminar 

 expansions of hepatic and anterior branchial mar- 

 gins Tutankhamen 



6b. Afferent channels normal, as in Parthenope 



7a. Merus of cheliped thigh-shaped, tapering dis- 



tally Thyrolambrus 



7b. Merus of cheliped trigonous, not tapering dis- 



tally Daldorfia 



2b. Carapace smooth, except for a few strong spines 



8a. Efferent channels opening at sides of endostome, as 

 customary in the Oxyrhyncha 

 9a. Carapace high, without a strong lateral spine 



Solenolambrus 



9b. Carapace depressed, with a strong lateral spine 



Leiolambrus 



8b. Efferent channels opening at middle of endostome, as 

 customary in the Oxystomata . . . Mesorhoea 

 lb. Carapace expanded to form a vault, concealing the ambulatory 

 legs 



10a. Carapace transversely oval, expanded laterally but not 

 posteriorly. No ridge on pterygostomian region . Aethra 

 10b. Carapace triangular or pentagonal 



11a. Carapace expanded both laterally and posteriorly. 



Pterygostomian region smooth . . Gryptopodia 



lib. Carapace expanded laterally only. Pterygostomian 



region with a ridge .... Heterocrypta 



Genus PARTHENOPE Weber 



Parthenope Weber, 1795, p. 92. Rathbun, 1904b, p. 171 ; 1925, p. 511. 



Not Parthenope Fabricius, 1798. 

 Lambrus Leach, 1815b, pp. 308, 310; type: Cancer longhnanus Lin- 

 naeus, 1758, by monotypy. Alcock, 1895, p. 259. Flipse, 1930, p. 21. 

 Type: The Indo-Pacific Cancer longhnanus Linnaeus, 1758, type of 

 Parthenope Weber (not Fabricius) by subsequent designation of Rath- 

 bun (1904b, p. 171). 



Description: Carapace either broadly triangular or ovate-pentagonal, 

 with front pointed but short. Surface granular, tubercular, or spiny. 

 Eyes enclosed in distinct orbits, a suture above and a hiatus below; 



