Mr. E. J. Miers on the Squillidae. 



terminal included) instead of eight, as in the Paris specimens — 

 moreover, in having the constricted portion of the arm at its 

 articulation with the wrist much more elongated, and the anal 

 shield (terminal segment) more spinous. 



Hab. Mazatlan (Pacific coast of Mexico). 



Not having seen specimens, I cannot express any definite 

 opinion with regard to the distinctness of this species from its 

 Atlantic congener. 



Sect. 2. Appendages of the antepenultimate joint of the three posterior pairs of 

 thoracic limbs compressed and greatly dilated, ovate or orbicidate-ovate *. 

 (Coronis, Latr.) 



Lysiosquilla scolopendra. 



Coronis scolopendra, Latr. Encycl. Meth. x. p. 474 (1825) ; Guerin, 

 Icon. R. A. Cr. pi. xxxiv. %. 2 ; M.-Edw. Hist. Nat. Crust, ii. 

 p. 531 (1837) ; M.-Edw. Or. in Cuv. Regne Anini. pi. lv. fig-. 3. 



Latreille describes this crustacean as having a narrower 

 and more depressed form than that of Squilla, and shorter 

 antennas and legs. The carapace is of a deep brown, and 

 generally smooth, with some small raised lines, in the shape 

 of fine longitudinal stria?, on a depression in the middle of 

 the dorsal surface of most of the segments. The rostral plate 

 is nearly triangular, and acute at the end. The terminal post- 

 abdominal segment is nearly square, a little obliquely trun- 

 cate at each postero-lateral angle, elsewhere entire, without 

 teeth or distinct spines. The raptorial limbs are whitish and 

 spotted with brown. The penultimate joint is oval, greatly 

 compressed, but somewhat more convex on one of its surfaces, 

 with the inner margin clothed with very small numerous 

 spinuliform cilia, and armed at base with three or four mobile 

 spines ; the dactylus is like that of Squilla, falcate or arcuate, 

 witli a dozen acute teeth on its inner margin, the terminal 

 spine being the largest. 



This crustacean formed part of a collection of Crustacea 

 made by M. Lalande at Brazil ; but as it had great affinity 

 with the L. eusebia, Pisso, it might, in M. Latreille's opinion, 

 have been obtained on the coast of the island of Madeira, 

 where M. Lalande stayed and collected for a few days. 

 When Milne-Edwards was engaged on the description of this 

 genus, in the second volume of the l Hist, naturelle des 

 Crustaces,' the type was no longer to be found in the collec- 

 tion of the Paris Museum. 



* In L. Brazieri, as noted above, the appendages of the last pair of legs 

 are not dilated. 



