22 Dr. Emil A. Göldi: Studien über neue und weniger 



The two genera, as well as those of Cardisoma and Ge- 

 carcoidea, are distingiüshed from each other by the different 

 form of the gnathopoda, which, not being shown in Dr. Cun- 

 ningham's drawing, I cannot appeal to. But since the species 

 of several genera described by Milne-Edwards are distin- 

 guished by having rows of spines or teeth on the walking-legs, 

 I think it more probable, that this species may be more closely 

 allied, throiigh tliQ form of the oral apparatus with üca than 

 with either of the others. 



Female. Carapace circularly oval; lateral margins not 

 converging until over the peniütimate pereiopod, then suddenly 

 narrowing to about one-third of the broadest diameter of the 

 carapace; anterior or intraorbital margin smooth and conti- 

 nously emarginate; latero -frontal margins rounded, not defined, 

 furnished with two short teeth formed rather by depressions 

 than dental elevations. Orbits broad, and not deeply impressed 

 in the carapace. Antennae short. First pair of pereiopoda 

 chelate, unequal, right the larger; chelae strong, having the 

 internal margin of the digital process of the propodos straight, 

 tapering, and armed with four or five streng tubercles ; dactyloa 

 curved, tapering, and armed with one or two small tubercles. 

 The rest of the pereiopoda are subequal in length, the last 

 being somewhat the shortest, and have the tarsi smooth and 

 unarmed. The pleon has none of the segments fused. The 

 telson is narrower at the base than the preceding segment." 

 Zu dieser Bemerkung tritt nun hinzu Fig. 3 auf Tafel XXI, 

 darstellend: „Uca Cunninghami nov. spec. $, nat. size: P, 

 pleon, Seen on the outer side, P„, the same inside in situ, 

 showing: — p, pleopoda; v — young crabs; z, termination ot 

 intestinal track; t, one of the pleopoda." 



Die beigefügte, also nach der Zeichnung von Dr. Cun- 

 ningham reproducirte Figur, die fragliche Krabbe von oben 

 gesehen darstellend, ist so gut — zumal für eine Skizze, wie 

 sie auf dem Schiffe gemacht werden kann — dass ich auf den 

 ersten Blick mein vermeintlich neues Thier wiedererkannte, 

 gleichzeitig aber die Unhaltbarkeit der Bate'schen 

 Classification einsah. Die Gattung Uca schliesst nämlich 

 Krabben ein, die sämmtlich breiter sind als lang bezüglich 

 ihres Cephalothorax, am vorderen Drittel des Seitenrandes eine 

 starke Wölbung aufweisen; die Glieder der Scheerenfüsse sind 



