190].] CRUSTACEA OP THE " SKBAT EXPEDITIOIS'." 573 



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

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

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

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

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

 fig. 4) iu the var. jaj^onicus of P. canaliculatus, 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." In 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 connected with the internal organs by means of 

 foramina in the floor of the capsule, and ha\'e 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. 



XLVII. Genus Sicyonia M.-Edw, 



89, SicyojSTIa lancifee Olivier. 



Palcemon lancifer, Olivier, Eacycl. Meth. vi. p. 634 (1807); 

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

 Loc. Pulau Bldan, Penang. 

 A male ; length 40 mm. 



XLVIII. Grenus Stenopusculus Eichters. 



90. Stenopusculus crassimakus Eichters. 



Stenopusculus crassimanus, Eichters, Beitr. z. Meeresfauna d. I. 

 Maurit. u. Seychellen, p. 1G8, pi. xviii. fig. 27 (1880) ; de Man, 

 Arch. f. Naturg. liii. i. p. 565 (1887). 



Loc. Pulau Bidan, Penang. 



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



JS^ote on the Genus Actseopsis Lanchester. 

 (FifZeP. Z. S. 1900, p. 741.) 



In this note I have corrections to make in regard to both species 

 and genus ; and I will take the species first. 



I. In the paper cited above I 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 Oarpilodes palUdus. In 

 doing this I erred, for the two forms are quite distinct, as may 

 be readily seen on comparing the two figures (I. s. c. & Borr. 

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

 that this mistake, which I regret exceedingly having made, was 

 entirelv mine. 



Proc. Zool. Soc— 1901, Vol. II No. XXXVIII. 38 



