Mr. E. J. Miers on Malaysian Crustacea. 377 



Thalassina scorpionides, Latr. Gen. Crust. & Ins. i. p. 51 (1807), nee 

 Guerin et Milne-Edwards ; Steenstrup & Liitken, Videnskabelige 

 Meddelelser, p. 257 (1861). 



Thalassina gracilis, Dana, U.S. Expl. Exp. xiii. Cr. i. p. 13, pi. xxxii. 

 rig. 5 (1852), young? 



Samangkabaai, Tandjong (an adult male) ; Borneo, Band- 

 jennassin (an adult female). 



In an old male from W. Borneo, which I am not inclined 

 to regard as specifically distinct, the spines of the branchial 

 and hepatic regions are much more prominent, and there are a 

 few spines on the cardiac region. The hands are less unequal, 

 and the larger hand is more distinctly granulated and pro- 

 portionally longer ; its length is more than once and a half 

 its breadth. 



Specimens presenting the characteristics of the adult are in 

 the Museum collection from the Indian Ocean, Philippines, 

 and Fijis. In what I consider to be the young of this species 

 the branchial and hepatic regions and the sides of the hands 

 are nearly smooth, and there is sometimes but a single spine 

 on the upper margin of the arm. Specimens are in the 

 Museum collection from Borneo, Penang, Singapore, the 

 Indian Ocean, Philippines (designated by White T. talpa), 

 and Fiji Islands. 



The reference to Herbst's C. anomalus, given by White, I 

 have not been able to verify, as the plate is wanting in the 

 copy of his work in the British Museum. 



In the synonymical references I have followed Steenstrup 

 and Liitken, according to whom the Thalassina scorpionides of 

 Latreille is not identical with the Chilian species referred to 

 under the same name by Guerin and Milne-Edwards, and 

 which Steenstrup and Liitken designate T. chilensis. 



Astacidea. 



ScyUarus Haani. 



ScyUarus Haani, v. Siebold in De Haan, Faun. Japon. Cr. p. 162, 

 pi. xxxviii. tig. 1 (1849). 



Aroe (Aru?) Islands (a fine adult male). 



This form is distinguished from all the other Scyllari with 

 which I am acquainted by the remarkable prominence of the 

 tubercles or elevations on the gastric, cardiac, and intestinal 

 regions, and. second, third, and especially on the fourth post- 

 abdominal segments ; the Aroe-Island specimen agrees very 

 closely with De Haan's figure in this and in all other respects. 

 But slighter prominences occupying similar positions are ob- 

 servable in S. aquinoctialis, 8. squamosus, and S. Sieboldii ; 



