'><> "ENDEAVOUR" SCIENTIFIC RESULTS. 



SEHA TYPICA, (C hilt on). 



(Fi-. (i a-d.) 



Terntirmn typicum, Chilian, 1884, p. 257, pi. 18, 



figs, la /. 



Selxi typica, (Jhilton, 1906, p. 572, (with synonymy). 



Locality. East Coast of Flinders Island, Bass Strait, 

 about 10 specimens, all small, the largest with body 4.5 mm. 

 long 1 . 



These specimens were found along with numerous other 

 Amphipoda collected at the same time. After examining 

 them and comparing them with New Zealand specimens, T 

 have no hesitation in referring them to this species, 

 'S'. typicri, which has hitherto been known only from a very 

 few small-sized specimens from New Zealand. 



There are altogether five species described of the genus 

 8ebu, all of them somewhat imperfectly known. In two of 

 ilie species the male differs from the female in the shape 

 of the first gnathopod. In the male the propod of the first 

 gnathopod is expanded and the palm shows various projec- 

 tions or teeth with concave depressions between them. In 

 the female the propod is much smaller and has the palm 

 produced so that the limb is distinctly chelate, the inner 

 margin of the fixed finger i.e., the palm being straight or 

 almost so. 



In his account of S. antarctica "Walker (1907, p. 37) 

 pointed out that the male of that species differs 

 from the female in the posterior peraeopoda, which 

 had the meral joint very much broadened and ex- 

 panded posteriorly. Walker speaks of his species as 

 having dimorphic males, some being similar to the 

 female and distinguished from it only by the absence 

 of incubatory lamellae, the others larger and differing in the 

 expansion of the meral joint of the last three pairs of 

 peraeopoda: though, according to "Walker's account and 

 figures, these large males have the first gnathopod similar 

 to that of the female. In N. x<nni<lcrxii Stebbing the female 

 only is known, but in the two species, $. armata (Chevreux) 

 and S. typica ( Chilton) there is a form which has been 

 described as the male differing, as already mentioned, from 

 the female in the configuration of the palm of the first 

 gnathopod ; in these two species the difference in the meral 

 joint of the last peraeopods has not previously been noticed. 



The largest of the "Endeavour" specimens, which 

 measure 4.5 mm. in length of body, differ from the figure 



