1896.] A. Alcock— Carcinohgical Fauna of India. 203 



Leucosia fugax, Fabricius, Ent. Syst. Suppl. p. 351 : Bosc, Hist. Nat. Crust. I. 

 236: Latreille, Hist, Nat. Crust, et Ins. VI. 119, pi. I. figs. 1, 2. 



Myra fugax, Leach, Zool. Miscell. III. p. 24: Desmarest, Consid. Crust, p. 169, 

 pi. xxviii. fig. 2 : Milne Edwards, in Cuvier, Regne Animal, Crust, pi. xxv. fig. 3, 

 and Hist. Nat. Crust. II. 126: De Haan, Faun. Japon. Crust, p. 134, pi. xxxiii. 

 fig. 1 : Bell, Trans. Linn. Soc. Vol. XXI. 1855, p. 296, and Cat. Leucos. Brit. Mus. 

 p. 12: Stimpson, Proc. Acad. Nat. Sci. Philad. 1858, p. 160: A. Milne Edwards, 

 Nouv. Archir. dn Mus. X. 1874, p. 45 : Hilgendorf, MB. Ak. Berl. 1878, p. 811 : 

 E. Nauck, Zeits. Wiss. Zool. XXXIV. 1880, p. 48 (gastric teeth) : Richters, in Mobius 

 Meeresf. Maurit. p. 157 : Miers, P. Z. 8. 1884, pp. 10, 13, and ' Challenger ' Brachy- 

 ura p. 313 : [Cano, Boll. Soc. Nat. Napoli, III. 1889, p. 253] : Miiller, Verh. 

 Ges. Basel, VIII. 1886, p 472: Ortmann, Zool. Jahrbuch., Syst., &c , VI. 1892, 

 p. 5S1 : J. R. Henderson, Trans. Linn. Soc, Zool., (2) V. 1893, p. 402. (Adult). 



Myra carinata, Bell, Trans. Linn. Soc. Vol. XXI. 1855, p. 297, pi. xxxii. fig. 3, 

 and Cat. Leucos. Brit. Mus. p. 13 : Haswell, P. L. S., N. S. Wales, IV. 1879, p. 50, 

 and Cat. Austral. Crust, p. 121 : Miers, Ann. Mag. Nat. Hist. (5) V. 1880, p. 316, 

 and Zoology H. M. S. 'Alert' pp. 184, 250: Sluiter, Tijds. Nederl. Ind. XL. 1881, 

 p. 160 : Miiller, Verh. Ges. Basel, VIII. 1886, p. 472 : A. O. Walker, Journ. Linn. 

 Soc, Zool., XX. p. 111. (Non-adult). 



Myra coalita, Hilgendorf, MB. Ak. Berl. 1878, p. 812, pi. i. figs. 6 and 7 : [Cano, 

 Boll. Soc. Nat. Napol. III. 1889, p. 253]. (Non-adult). 



Myra dubia, Miers, P. Z. S. 1879, pp. 20, 42. 



Myra fugax, var. coalita, Ortmann, Zool. Jahrbuch., Syst., &c, VI. 1892, p. 582. 



Carapace, in the adult, ovoidal, -with 3 sharp, usually recurved, 

 spines — one at either extremity of the posterior margin, and one very 

 long one in the middle line just above the posterior margin. On the 

 surface of the carapace are (1) some scattered punctiform granules, 

 almost invisible to the naked eye in the adult (except on the basal half 

 of the median posterior spine where they are always large and numer- 

 ous), and (2) a longitudinal median carina, almost or quite obsolete in 

 the adult. The regions of the carapace are not well defined. 



The front is broadly bidentate, and is prominently convex dor- 

 sally, but projects so little beyond the edge of the buccal cavern that 

 the spiniform angles of the branchial channels and the tips of the 

 external maxillipeds can be seen beyond it in a dorsal view : it and the 

 neighbouring parts are usually somewhat pubescent. 



Behind the tip of the front the antero-lateral boundary of the cara- 

 pace is formed by the obliquely-facetted side-wall of the sub-hepatic 

 region, the facet being bounded above and below by beaded lines on 

 both of which, near their posterior end, is a tubercle or tooth : the sur- 

 face of the facet is quite smooth. 



Behind the hepatic facet, between it and the branchial region, is 

 a very well defined notch corresponding with a depression on the pteryg- 

 ostomian face, this again being in continuity with a well-cut longi- 

 tudinal groove (quite independent of the epimeral suture) that traverses 



