19 



fin'uer^s uf the cepliakm in prujectiug tulieinilitVinu i)i'i.iiiiiueiice!S, visual elements 

 luinual, very few in uuinbei-. Superior autenna? consisting of a short and 

 thiek, uniarticulate ])ednncle and a large stylifoi'm, hiartieulate tiagelluni, the 

 terminal joint of which is very small. Inferior antennae in female hiartieulate, 

 originating from a large liasal .joint completely anchylosed with the eeplialon, 

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

 with distinctly 4-articulate peduncle and tiliform multiarticnlate Hagellum. 

 Anterior lip very small, without any Iniccal plate; epistonre slightly projecting, 

 carinated. Posterior lip wanting. Mandibles with the masticatory ])art 

 simple laminar, without ;ui\- armature. First i)air of maxillae with the basal 

 lolje distinctly develojied though nearly bare, masticatory h)be witliout spines 

 l)ut divided at the ti\) in a few acuminated projections, palp lamellar, uni- 

 articulate. .Second pair of maxilla' with both loljes acuminated and strongly 

 intlexed, without seta^ but tinely hairy, the exterior provided with a short 

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

 lobes very tiiin, tbliaceous and exserted to a narrfiw jxiint. (-rnathopoda 

 slender, sube([ual, densely hairy in the outer i)art. Pereio[)oda very slender 

 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- 

 jiodal joint and dactylus very small. Last ])air,mnch smaller than the rest. 

 The 2 segments of the urosome very sharply detined. Last pair of nropoda 

 with a short lateral ramus exteriorly, tiie others simple, with the jieduncle 

 nut detined. Telson extremely small. 



ItoiKirks. — Dr. Bovallius has been the hrst to call attention to the fact, 

 that the genus Clydonki of Dana is in all probability identical with the genus 

 Tj/iv established l)y Milne Edwards at a much earlier date, and hence lias 

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

 name the family accordingly Tyronida'. instead af ('hidouiidir. As recently 

 shown hy the Rev. Stel)bing there is, however, a still older name, which of 

 course ought to be preferred to that of M. Edwards, x'r/. the denomination 

 Schio. proposed hy Prestandrea as early as 1883 for a form, which evidently 

 is congeneric with that described In- Milne Edwards, and accordingly the 

 name of the family must be chamges to Scinidff. The genus comprises, 

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

 <liiferent parts of the Atlantic, the Pacific and the Mediterranean. In the 

 northern Ocean it is only re])resented by a single species, occurring on the 

 ciiast of Norway. 



