32 THE VOYAGE OF H.M.S. CHALLENGER. 



noticed by myself and by Dr. v. Willemoes Suhm, there are in the Challenger collection 

 seven other sj^ecies which have been more or less fully described by previous writers ; 

 these are Serolis 2Mi'Cidoxa, Serolis schythei, Serolis convexa, SeroUs tuhercidata, Serolis 

 lati/rons, and Serolis septemcarinata ; some notes upon these species will be found below. 



Of the. remaining six species, Serolis acutangula is probably identical ^vith some other 

 form, since Grube, who originally described it in 1871, omits all mention of it in his sul)- 

 sequently published (1875) Monograph of the genus; it is therefore useless to recapitu- 

 late or make any comments upon his description here. I have quoted the reference to 

 this description in the list of papers at the beginning of this Report. Serolis trilobi- 

 toides is closely allied to if not actually identical with Studer's Serolis cornuta; the 

 figure of this species which is given by Eights is not very good,' and the description, 

 which does not entirely agree with the figure, is not quite complete enough to make it 

 certain whether this is a good species or not. 



Serolis jilana certainly comes very near to Serolis convexa, and under the description 

 of the latter sjiecies I have indicated the points of resemblance and difference between 

 the two. Serolis gaudichaudii resembles very closely both Serolis plana and Serolis 

 convexa, but is nevertheless an undoubtedly distinct species; the points in which it 

 differs from the two latter are indicated under the description of Serolis convexa. The 

 two remaining species, Serolis serrei and Serolis carinata, require a fuller description. 



The former species is described by Lucas in the following terms : ■ — " Elle est 

 plus large c^ue longue, arrondi, testacee et finement tachue de points bruns. Les 

 six premiers segments thoraciques constituent de tres grandes lames pointues falci- 

 formes ponctuees, transparentes et non dentelees sur leur hordes comme chez le 

 Serolis trilobitoides. Le dernier segment abdominal, tricar'ene non dentele, plus large que 

 long arrondi et legerement sinueux dans le milieu de son bord posterieur presente une 

 epine assex grande, aigue, de chaque cote de ses bords latero-posterieures. La region 

 buccale, les pattes ainsi que tout le dessous du corps sont d'un jaune testace. Les 

 antennes sont testacees maculees de brun." This species, which attains a length of 

 27 mm. and a breadth of 36 mm., was obtained by the French vessel " Magicienne " in 

 the Strait of Magellan. Lucas mentions that it is closely allied to Serolis trilobitoides, 

 but it seems to me, from the above quoted description, that it is probably more nearly 

 related to Serolis schythei. 



It is to be hoped that a fuller description of this species as well as of Serolis carinata 

 will be published. Serolis carinata, which is one of the most interesting species of the 



' Studer {Archivf. Naturgesch., he. cit., p. 21, note) refers to a supposed error on the part of Eights ; the anterior 

 antennae are said to be represented in Eiglit's figure as if they originated below instead of above the posterior antennie. 

 This is not, however, the case with Eiglit's figure, but with Audouin and Milne-Edwards's copy of the figure whicli is 

 introduced into their Monograph of tlie genus (lot: cit., pi. ii. fig. 11) ; the absence of .shading here does make it appear 

 as if the anterior antenna; originated below the posterior. 



^ Bull. Soc. Eat. Frang., air. 5, t. vii. p. cxlv and cxlvi. 



