12 AMPHIPODA XOKMALIA, 



Fii'st pair of guathopodu long and slender; the second having 

 the propodos in the male developed into a large hand, of which 

 the palm embraces nearly the \\hole length of one side, and 

 furnished near the middle with a stout protuberance. The fourth 

 pair of pereiopoda are considei'ably longer than either the pre- 

 ceding or succeeding pairs, and have the basos developed into a 

 monstrous squamifonn plate. The three anterior segments of the 

 pleon are each anned dorsally with a pair- of teeth posteriorly 

 directed, one upon each side of the median line. 



In consequence of the large squamiform processes of the fourth 

 pair of pereiopoda, M. Edwards made a di\dsion in the genus Or- 

 chestia to separate it from the more normal form, where the great 

 development does not take place. 



Hah. Bay of Calamati near Petalidi, Morea {Gruerin). 

 In the Museum of the Jardiii des Plantes. 



4. Orchestoidea tuberculata. 



Orchestoidea tuberculata, Nicolef, Gay's Historia tie Chile, iii. pi. 2. f. 4. 



Spence Bate, Ann. Nat. Hist. ser. 2. vol. xx. 524, 1857. 

 Talitrus insculpta, Dana, U.S. Explor. Exped. pi. 57. f. 1. 

 Talitrus ornatus ( 5 ), Dana, Proc. Amer. Acad. Sei. Bost. ii. 201. 

 Talitrouus insculptus {S), Dana, Proc. Amer. Acad. Sci. Bost. ii. 202. 

 Orchestia tuberculata, Dana, U.S. Explor. E.vped. p. 1595 (addenda). 



Male. — Body tuberculate. Inferior antennas reaching to about two- 

 thirds the length of the animal ; the ultimate articulation of the 

 peduncle longer than the penultimate. Second pair of gnatho- 

 poda in the male having the propodos largely developed, of a some- 

 what oval shape, with a deep notch in the centre of the palm. 

 The coxse of the third pair of pereiopoda are not so deep as the 

 preceding, either in ISTicolet's or Dana's figure. 



*^ Female. — Segments of cephalon and pereion smooth, slightly sulcate. 

 Coxa and basos of each of the six posterior legs slightly sulcato- 

 areolate. Inferior antennae hardly half as long as body ; joints of 

 the flagellum transverse. Second pair of gnathopoda with a small 

 propodos, which is nearly elliptical ; dactylos minute and articu- 

 lated with the propodos by the dorsal margin, lying longitudinally, 

 hardly reaching to the apex. In other characters like the male." 



The segments of the pereion and anterior part of the pleon are 

 studded with tubercles ; these tubercles appear to be ranged in rows, 

 generally two on each segment, and ai'e continued down upon the 

 coxae. In Dana's figure the tubercles appear to have become con- 

 fluent, and form minute ridges : still the animal is too marked to be 

 mistaken for any other. 



Hah. Coast of Chili ((to?/); Valparaiso (Df/na). 



