CRUSTACEA. 
519 
STOMAPODA. 
Cynthia (Thoinpg.) is the male sex of the same genus of which Siriella 
(Dana) is the femde. They have been found together in the sea near Val- 
paraiso. The general form is nearly the same, but the abdomen is more 
slender in the female, more robust in the male ; the abdominal feet, rudi- 
mentary in the female, are well developed and provided with gills in the 
male \ the central and the inner lateral laminfe of the caudal fan (telson and 
last pair of abdominal feet) are provided with pigment in the male, but not 
in the female. A similar sexual difference, although not so great, was known 
in the allied genus Nematopus (Sars). The animal described and figured by 
Dana, pi. 44. fig. 1, as the male of Siriella is a female not yet perfectly de- 
veloped. The terminal joint of the stalk of the antennse is provided in the 
male with a hairy prolongation, which is absent in the female, and is analo- 
gous to the hairy plate at the same joint in the males of My sis and Podopsis. 
Dana is wrong in employing the presence or absence of this plate as a generic 
character. The species examined by the author is called Siriella edwardsii ; 
but he supposes that Cynthia thornsonii (M.-Edw.) may be the adult, and C. 
me7'mis (Kroyer) a young male of the same species. Another species occurs 
in the Mediterranean, at Messina, perhaps identical with S. gracilis (Dana). 
Claus, Siobold imd Kolliker’s Zeitschrift, xviii. pp. 271-279, pi. 18. 
Gonodactylus folinii, sp. n., Alph. M.-Edw. Nouv. Arch. Mus. iv. p. 66, 
pi. 18. figs. 8-11, Cape- Verde Islands. — G. hleekeni^ sp. n., ibid. p. 66, note, 
Batavia. 
Alhna (Leach). Sp. Bate supposes that this genus is the second stage of 
development of the genus Squilla. Ann. & Mag. Nat. Hist. i. p. 446. ^ 
TETRADECAPODA. 
AMPHIPODA. 
Gammarid.®. 
Orchestia brevidigitata, sp. n., Sp. Bate and Westwood, Hist, of Brit. 
Sessile-eyed Crust, vol. ii. p. 497, with two woodcuts, Banff*. 
Orchestia hwnicola, sp. n., Japan, in woods, far from the sea. Martens, 
Wiegm. Arch, xxxiv. p. 66. 
Montagna dypeata (Kroyer as Lencothoe) and norvegica (Lillj.), taken on 
the coast of Northumberland and Banff, described and their essential charac- 
ters figured by Sp. Bate and Westwood, 1. c. p. 499, 600. 
Acanthonotus oweni (Sp. Bate) seems to be identical with Gainmai'us ccrr- 
nigcr (J. C. Fabricius, 1781) and with Epimciia tricristata (Costa). Sp. 
Bate and Westwood, 1. c. p. 628. 
Opis leptochela, sp. n., Sp. Bate and Westwood, 1. c. p. 601, with woodcut. 
Shetlands and Isle of Man. — O. quadrimana^ sp. n., B. & W. p. 603, with 
woodcut, Banffshire coast. 
Ampelisca Icevigata (Lillj.), Sp. Bate and Westwood, 1. c. p. 604, with wood- 
cut, Durham. 
Ilaploops tuhicola (Liljeborg), found in deep water ofl* Berwick and Teign- 
