CANCROIDEA. 207 



Chiorodius obscurus? Plate 11, fig. 10 a, represents a front view of 

 the hand of a Chiorodius from Upolu, which approaches the monticulo- 

 sus in its areolets, but has much stouter hands and a more exsert arm, 

 and both the hands and carpus are smooth, or with obsolete promi- 

 nences. It appears to be the Chiorodius obscurus of Hombron and 

 Jacquinot, Voy. au. pole Sud, pi. 3, f. 4. The specimen is ten and a 

 half lines long ; the greatest breadth, fifteen lines ; ratio of length to 

 breadth, 1 : 143. Another smaller specimen, eight lines long (same 

 length as for a characteristic C. monticulosus) , has the hand as figured 

 in figure c. The fingers in the older specimen are without teeth, evi- 

 dently owing to age, the disappearance being due to wear. But the 

 absence of tubercles or spinules from the hand and carpus does not 

 seem to be due to age. Moreover, the hand is much stouter in pro- 

 portion, the width in the longer hand of a male being much greater 

 than half the length of the carapax, while it is about equal to half 

 the length in the C. monticulosus. The areolets anteriorly and poste- 

 riorly are distinct, but are not separated by as deep furrows, and are 

 therefore less prominent. The third joint of the posterior pair of legs 

 is less decidedly spinulous along the upper margin. The front and 

 the lateral margins are as in the ungulatus and monticulosus. The 

 inner margin of the carpus also projects in two low obtusish points. 

 The male abdomen is well represented by the figure of the abdomen 

 of monticulosus. 



Figure 10 &, represents an upper view of the arm and carpus of this 

 Chiorodius, of the same leg to which fig. 10 a belongs. 



2. Carapax anticd areolatus, postict planus aut imperfect^ divisus, areold 2 M non 

 subdivisa. Pcdes antici inermes ; articulus pedum 8 posticorum Btius supra non 

 spinulosus. 



CHLORODIUS SANGUINEUS? Edwards. 



Carapax non nitidus, antici bene areolatus, posticd fere planus, areold 

 2 M non omnino divisd, 3 M simplicwsimd, 3 L 4 L sejunctis, coalitis, 

 fronte subtiliter emarginato, juxta antennas vix saliente, margine 

 antero-laterali 7-dentato, dentibus subacutis, uno pone dentem S. 

 Pedes 8 postici ad margines dense ciliati, articulo tertio valde com- 

 presso supra subacuto; manu carpoque inermibus, supra subtiliter 

 exesis. 



