STL'DIES IN AL'STKAI.IAN CAIJCINM H.OiiV McNKll.l,. 107 



acute lobe, wliich is more proiiounceil in st)ine specimens than in others, 

 and the distal portion becomes elevated into a large angular lobe. The 

 cutting edge of the finger is generally more or lei>s deeply excavate, 

 though it may be nearly straight, paiticnlarly in the j-oungei- stages. The 

 mobile tinger is less blade-like than in var. tijiiica ; it is provided with one 

 or two enlarged denticles which are vai-iable in position, there being 

 either one in the middle of the finger-length, or one on the proximal or 

 distal lialf, or on both. A set of slightly enlarged denticles may also 

 occur at the base. The crest on the lower inner surface of the palm is 

 long and very prominent, and there are two well differentiated ones at the 

 base of the immovable finger. 



Uca marionis, var: vocans M. Edw. (nee. Linn). — Milne Edwards has 

 figured a male chela, which is intermediate between that of var. tomeris 

 and var. nitida, in which the inner edge of the immovable finger tends to 

 form a median projection and thereby approaches the foim of var. nitida. 



Uca marionis, var. nitida, Dana (Figs. 1, 2 and 5). — In this form the 

 immovable finger is armed with the usual proximal angular lobe ; there 

 are also two prominent angular projections, one distal in position, w^iile 

 the other is either submediau or in the distal half of the finger. The 

 movable finger is usually rathei' thickened and curved, and is provided 

 with one or more enlarged denticles which vary, as in var. vomeris ; a series 

 of enlarged denticles may also occur at the base. The two well defined inner 

 crests of the palm are very prominent, the third is either vei-y small or 

 is obsolete. 



Though these variations differ so considerably fi^om the typical form, 

 the series before me includes most of the intermediate stages connecting 

 one with another, while the fact that two forms, such as var. typica and 

 var. vomeris, and var. tijpica and var. nitida, are represented in collections 

 from circumsci-ibed areas convinces me that they are all referable to the 

 one species. 



Localities. — Trial Bay, New South Wales ; coll. J. R. Kinghoi-n, Jan. 

 1920 — var. vomeris and stages intermediate between var. vomeris and var. 

 typica. 



Brisbane River, Queensland — adult male (large hand missing). 



Eraser Island, Queensland — var. vomeris. 



Endeavour River estuary at Cooktown, Queensland ; coll. A. K. 

 McCulloch, June, 1918 — var. typica, var. vomeris, and stages intermediate 

 between the two. 



Kollan Island, King Sound, North-west Australia ; coll. Dr. H. 

 Basedow, 1916 — var. vomeris, and stages intermediate between var. romeris 

 and var. typica. 



Oubatche, New Caledonia — var. nitida. 



Port Moresby, New Guinea — var. nitida. 



New Hebrides — var. nitida, and stage intei^mediate between var. 

 vomeris and var. typica. 



