704 T. R, R. STEBBING. 



that genus being older than Alm-ona and Lanocira, both instituted by Hansen in 1890 to be 

 its companions. At the same date that author beautifully illustrated and described with his 

 accustomed clearness seven species from western waters, which he assigned to Dana's genus 

 Corallana. Miss Harriet Richardson in 1901 added to this set an eighth species from Florida. 

 Hansen had further noted eleven species earlier than his own as with more or less probability 

 belonging to the same genus or at least to the same family. One of them, however, is Corallana 

 hirticauda, the single species on which Dana founded his genus. Although the description does 

 not satisfy all modern requirements it enables the species when obtained to be recognized, 

 and the conclusion cannot be escaped that its generic character is distinct from that of the 

 species assigned to Corallana by Hansen and Richardson. These, accordingly, I have referred 

 to a separate genus Excorallana, distinguished by the great length of the apical tooth of 

 the mandibles, the bifid termination of the second maxillae, and the elongate antepenultimate 

 joint of the ma.xillipeds. The true Corallana agrees with Tachaea, Alcirona, and Lanocira, 

 in not having the point of the mandible very strongly produced, in having the apex of the 

 second maxillae simple, and in having the antepenultimate joint of the maxillipeds not longer 

 than broad. Hansen's definition of the Alcironidae appears very well to suit the Corallanidae, 

 taken to include the above-named four genera, but excluding Excorallana, which will become 

 the representative of a fiimily Excorallanidae. 



Gen. Corallana, Dana. 



Corallana, 1853, Dana, U.S. Expl. Exp., Vol. xiii. pp. 748, 773; 1879, Schiodte and 

 Meinert, Naturhist. Tidsskrift, Ser. 3, Vol. xii. p. 286. 



Schiodte and Meinert, in their treatise De Cirolanis Aegas simulantibus, group together 

 Baryhrotes, Tachaea, new genera, with Dana's Corallana. The first of these was placed by 

 Hansen in a separate family, Baryhrotidae. To the third the joint authors assigned six species, 

 one of them being Heller's Aega basalis fi"om the Nicobar Islands, the remaining five (of which 

 four were new) having all been foimd at Ubay in the Philippines. Two of their species they 

 distinguished as Corallana hirticauda, Dana, and Corallana hirsuta, n. sp. Their figures and 

 descriptions leave no doubt in my Tuind that they have had before them the original species 

 for which the genus was instituted 



For distinguishing this genus from the other members of the family it is convenient 

 to remember that Alcirona alone has the apex of the outer plate in the first maxillae armed 

 with two spines, that Tachaea alone has the joints of the maxillipeds reduced to six, apparently 

 by coalescence of the second and third, and that in Lanocira the second joint of the maxilli- 

 peds (leaving out of count the expansion in the female) is very little longer than broad, but 

 very much longer than broad in Corallana. 



4. Corallana hirsuta, Schiodte and Meinert. PI. L B. 



Corallana hirsuta, 1879, Schiodte and Meinert, Naturhist. Tidsskr., Ser. 3, Vol. Xii. 

 pp. 287, 297, PI. 5, figs. 11, 12. 



Dana, in describing Corallana hirticauda, from the coral reefs of Tongatabu, writes as 

 follows : — ' Body moderately narrow, posterior half of back to extremity of abdomen hirsute. 

 Head a little transverse. Eyes large. Antennae very unequal ; second pair long, reaching to 

 fifth segment of thorax ; flagellum about eighteen-jointed ; first pair not much longer than 



