CRUSTACEA. OF THE MEEttUI ARCHIPELAGO. 205 



each presenting two or three small teeth near their tips, whereas 

 the mobile finger has some similarly small teeth along its inner 

 edge. 



The ambulatory legs are completely glabrous. 

 Dimensions of the Mergui specimens : — 



millim. 

 Length of the cephalothorax (the epistome included) 15 



Breadth of the cephalothorax 14f 



Length of the chelipedes 27 



Length of the palm 5| 



Breadth of the palm 3f 



The following are the dimensions of Fabricius's large male 

 specimen preserved in the Museum of the University of Kiel * : — 



millim . 



Length of the cephalothorax (the epistome included) 29^ 



Breadth of the cephalothorax 29 1- 



Length of the chelipedes 61 



Length of the palm 12|- 



Breadth of the palm 10 



Genus Mtra, Leach. 



114. Mtra punctata, Herhst. 



Cancer punctatus, Herbst, Krabben und Krebse, p. 89, pi. ii. figs. 15, 16. 

 Myra carinata, Bell, I. c. p. 297, pi. xxxii. fig. 3. 



Myra punctata, Hilgendorf, Monatsber. d. K. preuss. AJcad, d. Wiss. 

 Berlin, '^ov. 1878, p. 811. 



Pour male specimens of various sizes were collected. 

 The genus Mi/ra without doubt stands much in need of re- 

 vision, and it is extremely probable that many of the species 



* Prof. Mobius also forwarded to me the type specimen of Fabricius's Leucosia 

 porcellana, which has hitherto been regarded by authors as belonging to the 

 genus Philyra, and was believed by Bell to be scarcely distinct from Fhilyra 

 glohosa. I am now able to state that Leticosia jiorcellana is a true Leucosia, 

 somewhat allied to L. rhomboidalis, de Haan. In Leucosia porcellana there 

 is a large thoracic sinus ; the upper surface is smooth and the cephalothorax 

 appears rhomboidal, being, however, less prominent anteriorly than in L. rhom- 

 hoidalis, de Haan. The front is little prominent and triangular. The upper 

 surfaces of the arms only present a few granules at their bases, covered by a 

 tuft of hairs, and the inner margins of the hands are granular. The specimen 

 sent to me was a female ; the cephalothorax is 19| millim. long and 17^ millim. 

 broad. 



