60 ME. E, J. MIEES ON THE IDOTEID^. 



Idotea lanciformis, Risso, Cr. de Nice, p. 136, pi. iii. fig. 11 (1816). 

 Leptosoma lauceolata, Risso, Hist. Nat. Eur. merid. v. p. 107 (1826). 

 Leptosoma appendiculata, Risso, Hist. Nat. Eur. merid. v. p. 107, pi. v. 



fig. 23 (1826) ; Hope, Cat. Cr. Ital. p. 26 (1851). 

 Leptosoma capito, RathJce, Beitr, in Mem. Sav. etrang. St. Petersb. iii. 



p. 384, pi. vi. figs. 7-9 (1837). 

 Idotea appendiculata, M.-Edw. Hist. Nat. Cr. iii. p. 135 (1840); White, 



List Cr. Brit. Mus. p. 95 (1847) ; Cat. Brit. Cr. B. M. p. 66 (1850); 



Pop. Hist. Brit. Cr. p. 224, pi. xii. fig. 3 (1857)] Lucas, Anim. 



artic. in Expl. Sci. Algerie, p. 62 (1849) ; Heller, Verh. zool.-bot. 



Gesellsch. Wien, xvi. p. 731 (1866) ; S. Bate &• Westwood, Brit. 



Sessile-eyed Crust, ii. p. 396, fig. (1868) ; Parfitt, Rep. Devon Assoc. 



vi. p. 255 (18/3); Stalio, Att. Istit. Venet. (ser. 5) iii. p. 1354 



(1876-77). 



Idotea acuminata, White, List Cr. Brit. Mus. p. 95 (1847) ; Cat. Brit. 



Crust. B. M. p. 66 (1850); Pop. Hist. Brit. Crust, p. 224 (1857) ; 



S. Bate S)- Westwood, Brit, Sessile-eyed Crust, ii. p. 394, fig. (1868) ; 



Parfitt, Rep. Devon Assoc, vi. p. 255 (1873). 

 Idotea angustata, Lucas, Anim. artic. in Expl. Sci, Algerie, p. 63, pi. v. 



fig. 3 (1849); nee Nicolet. 

 Idotea capito, Lucas, Anim. artic. in Expil. Sci. Algerie, Cr. p. 63 



(1849); Heller, Verh. zool.-bot. Gesellsch. Wien, xvi. p. 730 (1866); 



Czerniavshy, Mat. Zoo^'rflj'j A. ^on/icam, pp. 84, 130 (1868) ; Stalio, 



Att. Istit. Venet. (ser. 5) iii. p. 1355 (1876-77). 

 Leptosoma lanceforme, Hope, Cat. Cr. Ital. p. 27 (1851). 



Body narrow, elongated, moderately convex, Avifch indications 

 of a longitudinal median dorsal carina. Head v^ith its anterior 

 margin somewhat excavated, and its antero-lateral angles rather 

 prominent. Pirst four segments of the thorax each widest in 

 the middle, and with their lateral margins (in a dorsal view) more 

 or less angulated. ; the posterior segments of the thorax are 

 widest at or near their postero-lateral angles. Postabdomen 

 ovate-lanceolate, with the lateral margins at first straight and 

 then curving regularly to the distal extremity, which is subacute 

 or acute, or even acuminated, and with more or less distinct 

 traces o£ lateral sutures near its base, indicative of two coalescent 

 segments. Eyes small, placed in the middle of the lateral mar- 

 gins. Antennules do not reach the extremity of the antepenulti- 

 mate joint of the peduncle of the antennae, with their basal joints 

 moderately dilated. Antennae reaching sometimes to the posterior 

 margin of the sixth thoracic segment ; the last two joints of the 

 peduncle slender, subequal, and each longer than the preceding ; 

 flagellum about 19-jointed and longer than the peduncle. Legs 



