19 



corners of the cephalon in projecting tuberculiform prominences, visual elements 

 normal, very few in number. Superior antenme consisting of a short and 

 thick, uniarticnlate peduncle and a large styliform, Inarticulate nagellum. the 

 terminal joint of which is very small. Inferior antenme in female Inarticulate, 

 originating from a large basal joint completely anchylosed with tlie eephalon, 

 proximal joint very small, distal one thread-like; in male rather elongated, 

 with distinctly 4-articnlate peduncle and filiform multiartieulate thi'-vlluni 



v A. 



Anterior lip very small, without any bueeal plate; epistome slightly projecting, 

 carinated. Posterior lip wanting. Mandibles with the mastieat>rv part 

 simple laminar, without any armature. First pair of maxilhe with the basal 

 lobe distinctly developed though nearly bare, masticatory lobe \vithont spines 

 but divided at the tip in a few acuminated projections, palp lamellar, uni- 

 articulate. Second pair of maxilla* with both lobes acuminated and strongly 

 intlexed, without seta 21 but finely hairy, the exterior provided with a short 

 lateral tooth. Maxillipeds with the basal part rather small, the terminal 

 lobes very thin, foliaceous and exserted to a narrow point. Ghiathopoda 

 slender, snbequal, densely hairy in the outer part. Pereiopoda very slendei 

 and nearly naked; 3rd pair the longest and generally angularly bent, basal 

 joint very elongated and having the one or both edges strongly serrate, pro- 

 podal joint and dactylns very small. Last pair much smaller than the rest. 

 The 2 segments of the urosome very sharply denned. Last pair of uropoda 

 with a short lateral ramus exteriorly, the others simple, with the peduncle 

 not denned. Telson extremely small. 



Hew ark*. - - Dr. Bovallius has been the first to call attention to the fact, 

 that the genus Cli/donia of Dana is in all probability identical with the genus 

 Tyro established by Milne Edwards at a much earlier date, and hence has 

 proposed to restore the latter name as the elder one for the genus and to 

 name the family accordingly Ti/ronidn: instead at' ('///</<>i/i /'</. -\> recently 

 shown by the Rev. Stebbing there is, however, a still older name, which of 

 course ought to be preferred to that of M. Edwards, viz the denomination 

 Scina, proposed by Prestandrea as early as 1833 for a form, which evidently 

 is congeneric with that described by Milne Edwards, and accordingly the 

 name of the family must be changes to tich)idc: r lV genus comprises 

 according to Dr. Bovallius, no less than 10 different specie, distributed in 

 different parts of the Atlantic, the Pacific and the Mediterranean. In the 

 northern Ocean it is only represented by a single species occurring on the 

 coast of Norway. 



