128 Memoirs of the Indian Museum. [Voi,. IV, 



which occurs in most of the preceding species, there is in L. insignis a very peculiar 

 armature which consists of a trilobed median prominence, a sharp intermediate spine 

 and an angular lateral lobe. These are not separated by the smooth declivous dorsum 

 of the telson, as in L. acanthocarpus and the other species with a dorsal circlet of spines, 

 but are connected by a sharp transverse ridge. On the margin of the telson there are 

 two very large teeth, the intermediate and the lateral, on each side and two long 

 movable submedian spines. Between the latter are six pairs of small denticles (fig. 102) . 

 There are four short spines L between the mobile pair and the intermediate tooth, and 

 one between the intermediate and the lateral. 



The peduncular segment of the uropods is carinate along its antero-lateral margin 

 and a second carina, parallel to the above, runs to the middle of the distal margin where 

 it is continued as a long spine extending over the base of the proximal segment of the 

 exopod. The bifurcate process consists of a pair of large tricarinate spines, the outer 

 of which is scarcely shorter than the inner. In addition there is a sharp inferior spine 

 at the point of articulation of the inner uropod. On the external margin of the 

 basal segment of the outer uropod there is a series of six mobile spines ; the two outer- 

 most are curved and many times longer than the next of the series. On the ventral 

 surface there is a stout fixed distal spine projecting over the base of the ultimate 

 segment. 



No trace of any colour remains in the single specimen examined. 



^ Off N. Andaman I., 235 fathoms, .. 'Investigator'. .. 1 ^ , 49 mm. TYPE. 



5o°7'N., 79 7' E. 



12. Lysiosquilla latifrons (de Haan). 



1844? Lysiosquilla latifrons, De Haan, in Siebold's Fauna Japonica, Crust., atlas, pi. li, fig. 3, 

 text, 1849, p. 222. 



Lysiosquilla (Coronis) latifrons, Miers, Ann. Mag. Nat. Hist. (5), V, pp. 10, 25. 



Lysiosquilla brazieri, Miers, ibid., pp. 11, 125, pi. i, figs. 3-6. 



Lysiosquilla brazieri, Haswell, Cat. Australian Crust., p. 206. 

 1894. Lysiosquilla latifrons, Bigelow, Proc. U.S. Nat. Mus., XVII, p. 503. 



Lysiosquilla brazieri, Bigelow, ibid., p. 503. 

 1903. Lysiosquilla latifrons, Rathbun, Proc. U.S. Nat. Mus., XXVI, p. 54. 

 19 10. Lysiosquilla brazieri, Chilton, Trans. N. Z. Inst., XLIII, p. 139. 



I have seen no examples of L. latifrons ; the principal characters of the species 

 appear to be as follows : — 



The rostrum is broader than long with very strongly rounded lateral margins and 

 a sharp median spine. The cornea of the eyes is bilobed, but is very much smaller than 

 in the preceding species. 2 The dactylus of the raptorial claw bears six, rarely seven, 

 teeth. The lateral margins of the exposed thoracic somites are truncate. The short 



1 The innermost of these is probably homologous with the fixed submedian spine in L. acanthocarpus 

 and other species. 



% In De Haan 's figure, which probably represents a small specimen natural size, the breadth of the 

 cornea is about one-fifth the length of the carapace. In Mier's large example the eye, as might be ex- 

 pected, is proportionately smaller. 



