70 



much variation, ^o thai tli.e cHft'erences noted are of little import- 

 ance compared with all the numerous points of agreement. The 

 thick fur on the pcrxopods is a very conspicuous feature- 



Locality :— Two miles up Buffalo River, taken with small 

 ilirimp net on a nmddy bottom- 



Parasphakro.ma, n. g. 



I'ifth and sixth segments of the pcrieon laterally projecting* 

 beyond the rest. First diyision of the pleon with its lirst com- 

 ponent segment conspicuous, the second overlapping it, and alsa 

 the seventh segment of the perseon, but not the third of the pleon- 

 of which the second^ third, and fourth segments are, as usual^ 

 coalesced in the middle; telsonic segment with blunt dorsal pro- 

 cess near the middle and shallowly concave emargination of the 

 ajjcx- Epistome elongate- its apex prominent beyond the rostral 

 p(.)int of the head and between the somewhat projecting bases of 

 the llrst antenna?. Second antemue geniculate between the 

 fourth and fifth jomts. The trunk-limbs not bidentate in appear- 

 ance, a slender spine lying close withir. the nail. Hind perseo- 

 pods slender- Last joleopods without conspicuotis transverse 

 ])leating- 



The generic name alludes U) the obvious affinity between this- 

 and other Sphaeromidse. 



This genus agrees with Dyiiaiiiciu-. Leach, in having a simple 

 excavation of the telsonic apex, but several distinctive marks are 

 presented in the above definition. DyiiaJiicnc itself still remains 

 obscure, the adult male form not having been determined. Bate 

 and Westwood in their discussion of it (British sessile-eyed 

 Crustacea, vol- 2, p. 418) say. '' Tn our figures of the second 

 maxilla in D. rubra and MoiiUiq;/!!'. onl\- one of the lobes was 

 observed on dissection." Their figures, however, show that the\- 

 are referring nottothesecond buttht-first maxilke. Both pairs 

 are normal, as they might easily have satisfied themselves, in the 

 two forms m»^ntioned. 



It is possible that Cunningham's CyinoJocca ilar:,.u'iiii if better 

 known might be included in this genus, although that species 

 has the outer branch of the uropods scarcely half as long as the 

 inner, while in the si)ecies here to be described the outer branch 

 is fully as long as the inner (see Trans. Linn. Soc. London, 

 vol. 27, p. 499, pi. ,59, fig. I, 187 1, and Studer, Isopoda of the 

 r-razelle, p. 18, Berlin, 1884. 



r.\KAS:'IIAEl<OMA l'J«»MIXK\S, U- sp. 



Plate 13. 



'file head is nuich l)roader than its length, hounded by a slight 

 ridge in front of tlic eyes, in advance of these being folded 



