1926] Schmitt, Crustaceans Collected by the Congo Expedition 45 
like ground may be several feet in thickness and is essentially composed of 
tiny rootlets of mangroves (Rhizophora mangle Linnzeus), which by this 
means are able to secure anchorage in such sites. 
‘The larger holes are the work of the beautiful blue crab, Sarmatium 
curvatum (H. Milne Edwards), whose carapace is nearly one inch and a 
half across and which may be seen at any time outside. Its galleries 
criss-cross the peat-like mass in every direction and some usually reach 
slightly beyond the level of the lowest tide. After cutting off large 
chunks with a hatchet, I found that the snugly fitting tiny channels of 
Upogebia may start at the surface or from any point along the larger 
tunnels of Sarmatium. It would be difficult to give an estimate of their 
number but in a piece of peat the size of a man’s fist as many as a dozen 
might be found. Only by cutting and breaking the galleries apart could 
Upogebia be removed. In spite of their numbers they seem to be fairly 
localized, for I never found them anywhere else, with the exception of 
one specimen from San Antonio which had burrowed into decomposed 
mangrove wood. They apparently never come to the surface from their 
burrows. When alive they are pale reddish. They are not eaten by 
the natives.’ (H. L.) | 
Tribe PAGURIDEA 
Paguride 
Dardanine 
DarRDaNvus Paulson 
Dardanus Pauuson, 1875, ‘Crust. Red Sea,’ p. 90; Rarusun, 1902, Proc. U. 8. 
Nat. Mus., X XVI, p. 33. 
Dardanus pectinatus (Ortmann) 
Text Figure 69 
Pagurus striatus var. pectinata ORTMANN, 1892, Zool. Jahrb. Syst., VI, p. 284, 
Pl.. x1, fig. 1@. 
Petrochirus arrosor pectinatus RatuBun, 1900, Proc. U. S. Nat. Mus., XXII, p. 
302. 
Pagurus arrosor var. pectinata BaALss, 1921, ‘Beitr. Kenntnis Meeresfauna West- 
afrikas,’ ITI, p. 48. 
Brazil (Ortmann); Dakar, Senegal (Rathbun). 
St Paul de Loanda, September 23, 1915, 107, 12 (ovig.). 
The variety pectinatus of Dardanus arrosor is so strikingly distinct 
that it unquestionably should’be considered a separate species as Miss 
Rathbun (loc. cit.) has suggested. Literally, one can distinguish them 
with the eyes shut. | 
