Mr. E. J. Miers on the Squillida?. 5 



by the absence of the long copulatory appendages which arise 

 from the bases of the last cephalothoracic limbs in the latter sex. 

 In the present paper it has not been thought necessary to 

 describe more than one or two typical species of each genus 

 in detail ; of the other species only the principal distinctive 

 characters are indicated. 



Lyslosquilla. 



Coronis, Latreille, Fam. naturelles Regne Anim. p. 183 (182.5) ; 

 Encycl. Meth. Hist. Nat. x. p. 474 (1825) ; Crust, in Cuvier, Regne 

 Anim. iv. p. 109 (1829) ; M.-Edwards, Hist. Nat. Crust, ii. p. 530 

 (1837) : nam. prceoc. 



Squilla (§), M.-Edwards, Hist. Nat. Crust, ii. p. 518 (1837). 



Squilla (sect. i. Maculates), De Haan, Faun. Jap. Crust, p. 220 (1849). 



Lijsiosquilla, Dana, Crust. U.S. Expl. Exped. xiii. p. 615 (1852). 



Carapace not longitudinally costate, the cervical suture 

 posteriorly obsolete. Rostral plate reaching to, but usually 

 not covering, the base of the eye-peduncles. The five exposed 

 thoracic segments and the segments of the postabdomen loosely 

 articulated and depressed ; the latter are wider than the 

 thoracic segments, and are not longitudinally carinate ; the 

 terminal segment is transverse ; and the two mobile spines 

 of the posterior margin are absent or very minute. Dactylus 

 of the raptorial limbs not dilated at base, and armed on its 

 inner margin with long and usually numerous spines. The 

 appendages of the three posterior pairs of thoracic limbs are 

 slender and styliform, or dilated and compressed. 



Sect. 1. Appendages of the antepenultimate joint of the three posterior 

 pairs of thoracic limbs compressed, but scarcely dilated, almost linear. 

 (Lysiosquilla, Dana.) 



Lysiosquilla maculata. (PL I. figs. 1, 2.) 



Squilla armaria, Rumph, Arnboin. Rarit. p. 6, pi. iii. fig. E (1705). 

 Squilla maculata, Fabr. Ent. Syst. ii. p. 511 (1793), Suppl. p. 415 



(1798) ; Lamarck, Hist. Anim. sans Vert. v. p. 188 (1818) ; Desm. 



Consid. Crust, p. 250 (1825) ; Latr. Encycl. Meth. Hist. Nat. x. 



p. 470 (1825) ; M.-Edwards, Hist. Nat. Crust, ii. p. 518, pi. xxvi. 



fig. 1] (1837) ; De Haan, Faun. Japon. Cr. p. 221 (1849); White, 



List Crust. Brit. Mus. p. 83 (1847). 

 Cancer (Mantis) arenarius, Herbst. Nat. Krabben u. Krebse, ii. p. 96, 



pi. xxxiii. fig. 2 (1796). 

 Lysiosquilla maculata, Miers, P. Z. S. p. 138 (1877) ; Pbilosopb. Trans. 



Roy. Soc. clxviii. p. 494 (1879). 



Carapace smooth, oblong-oval, somewhat widening poste- 

 riorly, and rounded at its antero-lateral and postero- lateral 

 angles, without longitudinal carina?. Rostrum semioval, flat- 

 tened, and acuminated at its distal end. The exposed thoracic 



