€2 NOTES ON TASMANIAN CRUSTACEA, ETC. 



first gnathopod in the female is not simple, but sub-chelate, 

 that is to say, it has the precise character which separates 

 Orchestia from Talorchestia.'* Unfortunately the figures which 

 accompany Haswell's original description (in Proc. Linn. Soc. 

 N.S.W., vol. iv., pi. vii., fig. 6) are too imperfect to be of any 

 value for reference, while the description of the female gnatho- 

 pod (I.e. p. 248) is by no means clear, and may easily stand the 

 interpretation put on it by Mr. Stebbing. In specimens 

 examined by me, the first gnathopod in the female is simply 

 unguiculate (fig. 6) while the second (figs. 7 and S) is imperfectly 

 sub-chelate. There is no doubt, therefore, that Prof. Haswell 

 is correct in his identification of this species as a Talorchestia. 

 The species is apparently abundant on the beaches between 

 tide-marks, as I have numerous specimens taken from the under- 

 sides of stones in the Derwent and Huon estuaries, and from 

 Pirates Bay. I have also one large female specimen, caught 

 in a rock-pool at Pirates Bay, which looks difl'erent in general 

 appearance, but appears in details of structure to assimilate so 

 closely to this species that I am unable to separate it. It is 

 fully half an inch long, and has the whole anterior part of the 

 body more tumid than my other specimens. The New Zealand 

 Talorchestia quoyana and T. tumida are species which cannot 

 bear immersion in water, as they drown in a short time. This 

 Tasmanian species appears to resemble littoral species of 

 orchestia in this respect. 



17. Hyale rupicola. 



Allorchestes rujpicola. Hasw. (Proc. Linn. Soc. N.S. Wales, vol. 



iv., p. 250, pi. viii., fig. 1.) 



Specimens of this species were obtained by me from under 

 atones between tide-marks in the neighbourhood of Hobart. 

 They difier from specimens taken in Port Jackson, and kindly 

 sent me by Prof. Haswell, in having the inferior antennae 

 stouter and more densely fringed with setae on the lower 

 maj-gin. Prof. Haswell has not described the differences in 

 the sexes ; his description of the gnathopoda applies to the 

 male only. 



In the females the first gnathopod very closely resembles the 

 corresponding limb in the male, but is smaller. The second 

 gnathopod is also very similar in general form, but is con- 

 siderably larger than the limb anterior to it, and has a some- 

 what similar ciliated projection on the lower side of the carpus. 

 The so-called marsupial plate is large, rounded in front, ending 

 in an acute postero-inferior angle, and is finely fringed all 

 round with cilia. The coxal plate of the same limb is nearly 

 circular, and its margin is quite smooth. 



This species has not hitherto been recorded from Tasmania. 



