1001.] CRUSTACEA OF THE " SKEAT EXPEDITION." 573 



bases of the 4th pair of legs, which structures are formed as a 

 backwardly directed process of the coxie of the 4th legs, and are 

 freely movable with them, as opposed to the fixity of the thelycum 

 proper. A possibly (? and see below) analogous structure has 

 been described by Spence Bate (Chad. Macr. p. 247, pi. xxxii. 

 fig. 4) iu the var. japonicus of P. eaaaliadatus, as to which he says: 



- A large thelycum which extends forwards as far as the base 



of the antepenultimate pair of pereiopoda, whence project two 

 large leaf-like appendages/' Iu this variety they are, however 

 very large and foliaceous, and so quite different in appearance to 

 the small plate-like structures in the present species ; moreover 

 Spence Bate adds the following remark to this description : " They 

 appear to be counected with the internal organs by means of 

 foramina in the floor of the capsule, and have no connection what- 

 ever with the 5th pair of pereiopoda.'' I can find no trace of any 

 connection between the internal organs and this structure in the 

 present instance — the structure being, as I have said, freely 

 movable and apparently nothing more than an outgrowth of the 

 coxa of the 4th pair instead of the 3rd ; its analogy, therefore in 

 the two forms seems doubtful. 



XLTII. Genus Sicyoxia M.-Edw. 



89. Sicyoxia laxcifeh Olivier. . 



PcUcemon lancifer, Olivier, Encycl. Meth. vi. p. GG4 (1807)- 

 Ortmann, Zool. Jahrb. Syst. v. p. 453 (1891). 

 Loc. Pulau Bidan, Penang. 

 A male ; length 40 mm. 



XLYI1I. Genus Stexopcscitlus Eichters. 



90. Stexopusculus crassimaxus Eichters. 



r Stenopusculus crassimanus, Eichters, Beitr. z. jVTeeresfauna d. I. 

 Maurit. u. Seycbellen, p. 168, pi. xviii. fig. 27 (1880) ; de Man. 

 Arch. f. Naturg. liii. i. p. 505 (ls>7). 



hoc, Pulau Bidan, Penang. 



A male and four females (two with ova). Length from 12 mm. 



Note on the Gentu Actaeopsis Lanchester. 

 {Vide P. Z. 8. 1900, p. 741.) 



In (his note I have corrections to make in regard to both species 

 and genus ; and I will take the Bpecies first. 



1. In the paper cited above 1 referred the specimens on which 

 this genus was founded to a form that Mr. Borradaile was de- 

 scribing at the same time under the name Carpi lodes i><dr>,lns. l n 

 doing this 1 erred, tor the two forma are quite distinct, as may 

 be readily sees on comparing the two figures (I. s. c. & Hun-. 

 P.Z.S. 1900, pi. xl. fig. 3). It is due to .Mr. Borradaile to say 

 that this mistake, which I regrei exceedinglj having made, was 

 * nt irelj mine. 

 PbocZool. 3oc. L901, Vol, II No. XXWIII. 



