
462 RECORDS OF THE S.A, MUSEUM 
Several species in the collections now under consideration are represented 
only by specimens lacking part of the front legs. Three of these are deseribed 
and so, necessarily, are placed in both sections of the key, where they are marked 
with an asterisk; rochfordi sp, nov. almost certainly belongs in the first. group. 
The inclusion in Gynodiastylis of species with telson armed and with post-ansl. 
part renders more difficult concise diagnosis toi assist separation of females of this 
genus from those of Paradiastylis; the male of the last-named of course is readily 
recognized by the long flagelinm of the second antennae and the development of 
pleopods, There are, however, qnite marked differences in the peraeopods; apart 
from those already referred to (Hale, 1945, p. 173) there are, for instance, the 
thickened and shortened distal carpal seta of the stout third to fifth legs, referred 
to in the desetiptions, which is usually found in Gynodiastylis, but apparently not 
in the few species belonging to Paradiastylis, The uropods in the latter bava the 
pedunele long and slender, whereas in Gynodiastylis it is wider, Incidentally, the 
fact that lesa than three segments are apparent in the endopod of this appendage 
in some species of Gynodiastylis is important only as a specific character, and the 
number of joints may differ in the sexes. 
Dic. (Stetbing 1910, p. 415) has the first peraeopods of the same type as in 
Gynodiastylis, although the propodus is relatively longer than in those species with 
elongate carpus, and the cylindrical telson is much longer than in any of the species 
incladed in @ynoddastylis. While these characters are perhaps not of great im- 
portance I think that Gynodiastylis should remain separated from Dic because of 
the difference in the third maxilliped, even if this appendage proves to lack the 
exopod in the female of Stebbing’s genus, The same holds for Zimmeriana gens 
nov. whatever the condition of thoracic exopods may be in the female of Dic (see 
Yammer, 1914, pp, 192-193). . 
As previously noted, the armament of the male telson does not differ markedly 
from that of the male. In the male the flagellum of the second antenna is short 
(as a rule not much longer than pednnele), stout, and furnished with dense sen- 
sory setae, while exopods are present on the first four pairs of legs, the first three, 
or on first and second only, The first antenna, as in the other available adult males 
of the group, differs little from that of the females and is not furnished with the 
dense brush of sensory setae oceurring in some other Diastylid genera; inciden- 
tally, Calman (1912, p. 669) suggests that such setae are situate on the enlarged 
proximal segment, of the outer flagellum rather than on a separated area of the 
third peduncular joint. 
KEY TO SPECIES OF GYNODIASTYLIS. 
1, Propodue of frst peranppod with eight to twelve uetas, subequal in length and at least almost 
twice as long as combined langths of propodus and dactylue; carpus of same limb elongate, 
almost twice ae long aa propodus, or more at ve es «- & 
Propodus of firat peracopod with one to four unequal astae, the longest at moat little more 
than coinbined lengths of propodus and dactylus; carpue of same limb usuaily not differing 
gvoatly in Jength from propodus, at most barely more than balf aa long again as it .. iy 
2. Carapace seulptuved, with at least five ridges ou each side at se ow OW 
Carapace amoath, ar with at most three ridges on each side a) 24. 
3. Endopod of uropod umisegmentate in both soxes 4. or carinate Calman. 
Endopod of uropad bi- or trisegmentate ,, <= ae 
4, Telaon with ong-fourth of its length postanal and armed with # pair of distinct. torminal 
zpines, Endopod of tiropod trisegmentate in male .. ar *‘rochfordt ap, nov. 
Telson with no definite post-2nal portion, unarmed or with tudimentary terminal spines. 
Endopod of uropod bieegmentate in hoth sexes oe o 1, 5. 
First segment of endopod of uropod mueh shorter than second .. : lata sp. Tov, 
Begmonta of endopod of uropod subequal in length .. -{. te -- & 
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