10 DR. W. T. CALMAN ON A COLLECTION OF 



the tubercles on the carapace being very niucb dejiressed, confluent, and smooth. I 

 believe, however, that they must be referred to the same species. 



Localities. " Thursday Island " ; " S. of Orman's reef, 5-7 fath." ; " Channels between 

 reefs, Mabuiag " ; " Channels between reefs, Mer and Dara " (5 specimens). 



ACT.a;A GRANULATA, var. CARCHARIAS (White). 



Actaa carcharias, White, Proc. Zool. Soc. London, 1847, p. 224 ; A. Milne-Edwards, N. Arcli. Mus. 

 Paris, i. p. 276 (1865). 



A single female specimen, perhaps sterile, the abdomen appearing unusually narrow. 

 It agrees perfectly with White's type specimen in the British Museum, save that the 

 under surface is rather smoother. I have no doubt that Miers is right in regarding this 

 as merely a variety of A. gramdata (Chall. Eep., Brachyura, p. 122). The Japanese 

 specimens of A. gramdata referred to above show a tendency towards this variety in the 

 rougher aspect of the carapace as compared with Savigny's figure. 



Locality. " S. of Orman's reef." 



Distribution. Swan Eiver, W. Australia ( White). 



AcT^A Peronii, var. squamosa, Henderson (?). 



Act<sa Peronii, var. squamosa, Henderson, Tr. Linn. Soc. London, (2) Zool. v. p. 357. 



A male specimen, 10 mm. in length and 14 mm. in breadth. It differs much in 

 appearance from the few specimens of A. Peronii (all of smaller size) available for 

 comparison, but it agrees closely with the short description given by Prof. Henderson 

 of his var. squamosa. The tubercles of the antero-lateral margin are replaced by 

 sharj^ spines, of which there are five on each side behind the external orbital tooth. 

 In the typical A. Peronii there are only four tubercles on the antero-lateral margin. 



LocalUy. " Torres Straits." 



Distribution. India {Henderson). 



AcTiEA HTSTRix, Micrs. 



Acteea hystrix, Miers, Kep. ' Challenger ' Brachyura, p. 121, pi. xi. fig. 3. 



Pour female specimens having the following dimensions : — 



Breadth-ratio. 

 1*22 

 1-3 

 1-36 

 1-43 



The measurements given by Miers are : — 



6-0 mm. 8-0 mm. 1-33 



Our smaller specimens agree very closely with the single type specimen. The 

 measurements given above show a regular increase in the relative breadth of the cara- 

 pace with increasing age. In the largest specimen the antero-lateral borders are more 

 curved, the front is narrowei-, and the carapace departs from the hexagonal outline which 

 it presents in the smaller specimens as in Miers's figure. The surface of the carapace is 



