58 ON AUSTRALIAN LETJCOSIIDjE, 



Bell ; tlie proportions, however, of the transverse to the 

 longitudinal diameter of the carapace bring it nearer the genus 

 Oreophorus, between which and Lithadia it may be regarded as 

 forming a connecting link. 



Length about 4 lines ; breadth about 5. 



Hah. Fitzroy Is. (Che vert Eped.) 



G-entjs IX. — Arcania, Leach. 



Sp. 1. Arcania gracilipes, Bell, (I. c, p. 310, pi. 34, fig. 9). 

 "Testa granulosa, tuberculis quinedecim supra, et tribus ad 

 marginem posteriorem instructa ; pedibus anticis tenuissimis." 



Hah. Darnley Id. (Chevert Exped.) 



Sp. 2. Arcania novem-spinosa, Adams and White, (Crust, of the 

 Voyage of the Samarang, p. 56, t. 13, f. 1). "Thorace hevi, 

 granuloso, marginibus latero-anterioribus spinis duabus, latero- 

 posterioribus spinis duabus, posteriori spina longa, recta." 



Hob. Darnley Id. ; Cape Grenville ; Cape York. (Chevert 

 Exped.) 



Sj). 3. Arcania granulosa, Miers, (I. c, p. 240, pi. 38, fig. 29). 

 Testa granulosa, sub-globosa, tuberculis nullis, margine spinis 

 decern brevibus acutis instructo, regione intestinali spina una. 



Hah. Moreton Bay. (Brit. Mus.) 



Sp. 4. Arcania pulcherrima, sp. nov. (Plate 6, fig. 4). Testa 

 globosa, paulo latiore quam longiore, tuberculata, margine laterali 

 spinis sex tuberculatis armato, laterali utrinque reliquis longiore ; 

 pedibus anticis gracilibus, longissimis. 



Carapace globose, rather broader than long, covered with 

 vertically elongated granules and armed above with thirteen 

 tubercles or short spines which are covered with granules similar 

 to those on the rest of the carapace. Lateral border armed with 

 six spines — the median posterior spine found in A. septemspinosa, 



