REPORT ON THE ISOPODA. 33 



genus, on account of its occurrence so far north as California, has been briefly cliar- 

 aeterised by Lockiugton^ as follows: — "Thorax and abdomen conspicuously keeled upon 

 the centre of every segment ; the first segment slightly waved on its posterior margin, 

 the curve of the segments increasing rapidly in such a manner that the last entirely 

 encloses the free abdominal segments on their sides. Caudal segment rounded at the 

 extremity, vnth two marginal teeth on each side at a considerable distance from the 

 extremity, the central carina running the entire length of the segment; last basal joint 

 of inner antennte longer than the flag-ellum ; flagellum of outer autenute much shorter 

 than either of the two of the preceding basal joints, and last basal joint about ecpial in 

 length to the penultimate. Eyes large, reniform, conspicuous. The texture of the 

 upjjer surface of a dried specimen under a two-thirds power has a somewhat squamate 

 appearance. Colour a greyish-brown, diversified with dots and irregular markings of 

 black ; hands long and slender ; dactylos ecjual in length to the manus. 



" Length, 0-21 inch; width, 0-16 inch." 



Two specimens from San Diego, California. 



1. Scrolls paradoxa (Fabricius) (PI. V. figs. 12-14). 



Oniscus paradoxus, Fabricius, Mantissa Insectoruin, Hafnife, 1787, t. i. jx 240; Systema Ento- 



mologia;, Flensburgi et Lipsiaj, 1775, p. 296. 

 Ci/mo/hna paradoxa, Fabricius, Entomologia Systematica, Hafniw, 1792-98, SuppL, p. 301, 



and t. ii. p. 503. 

 Serolis fabridi, Leach, Diet. d. Sci. Nat., 1818, t. xii. p. 340. 



Scroll's orhiijiii/i, Audouin and Milne-Edwards, Arch. d. Mus. d' Hist. Nat., 1841, t. ii. p. 25. 

 Semlis orhiijniana, Jlilne-Edwards, Hist. Nat. d. Cru.st., vol. iiL p. 232. 

 Serolis paradoxa, Miers, Crustacea collected during Survey of H.M.S. "Alert," Proc. Zool. Soc. 



Lond., 1881, p. 61. 



Serolis j)aradoxa is the type species upon which the genus Serolis was founded by 

 Leach. The rfnimal was first ol)tained on the shores of Patagonia by Sir Joseph Banks at 

 the close of the last century, and these specimens were described by Fabricius as Oniscus 

 jxiradoxus ; in a subsequent work Fabricius altered the name to Cpnothoct, paradoxa. 

 In the twelfth volume of the Dictionuaire des Sciences Naturelles, Leach gave some account 

 of this species which he termed "Serolis fahricii." The first full description of the species 

 is contained in the memoir of Audouin and Milne-Edwards," and subsequently Grube^ 

 in his important Monograph gave a fuller account of this same species, but under the 

 name of Serolis orhigniana. In a short note published in the Journal of the Godeffroy 

 Museum,* Schmeltz called attention to the identity of Serolis fahricii with another 

 species described by Audouin and Milne-Edwards under the name of Serolis orhigmji. 

 More recently Miers, in his account of the Crustacea collected during the voyage of the 

 " Alert," has also pointed out the identity of these two species. 



1 Proc. Calif. Acad. Nat. Sci., vol. vii. p. .36. = Loc. cit, p. 25. 



3 Loc. cit, p. 225. * Part -xii. p. 161. 



(zool. chall. EXP. — PART xxxHi. — 1884.) Kk 5 



