CRU8TACKA MALACOSTRACA. III. 



does the present species." (M. A/urrayi); but this quotation shows that at least neither Walker nor 

 Stepheusen had read my text, as I wrote (1895) on Af. longicornis: "in detn Ban der SchwitmnifiMe 

 mid Uropoden (so weit sie vorhanden sind) stiinint es mehr mil Miinnopsis tvpifa M. Sars als mil 

 BHty*0* /&***** G. O. Sars uberein, aber es weicht in dem Ban der Mandibcln grundlich von t>eiden 

 ah". These words may prove sufficiently that it was very easy for Sars to point out that difference. 

 .!/. longicornis H. J. H. is allied to M. occanica TatL and At. spiniftr Vanhoffeii (1914). Of the remaining 

 species referred to Munnopsis, Af. auslralis Bedd. will be mentioned presently; .*/. lati/rons Be<ld. and 

 .)/ longircmu Richardson are closely allied but, like M. gracilis Bedd., too imperfectly known for di.scus- 

 :i on affinities. 



The material from our area comprises four species, viz. Munnopsis typica M. Sars, M. occanica 

 TatL, a new species closely allied to Af. auslralis Bedd., and the form described by Tattersall as A/MU- 

 nopsoidi-s lieddardi TatL But a study of these forms showed that it was necessary to divide the genu.s 

 Munnopsis into three genera. Af. typica has the anterior thoracic segments and especially third segment 

 much broader than the rather narrow three posterior segments, and these three are immovably coalesced 

 with each other and with the abdomen; the mandibles have no molar process, well developed palp, 

 and on the left mandible only rudiments of setaz near the lacinia; the natatory legs have the two 

 <li>tal joints moderately broad; in the male the second pair of pleopods are free to the base with their 

 copulatory organ extremely elongate, and the uropods are moderately long; this species must of course 

 remain as the type for the genus Munnopsis M. Sars. But M. occanica TatL must be removed ; it agrees 

 with Af. typica in having well developed maudibular palps, but the mandibles have a number of well 

 developed setae before the incisive dentate part and a slender conical molar process; the difference in 

 breadth between the anterior and the posterior thoracic segments is moderate; the three posterior seg- 

 ments and the abdomen are movable, the fifth joint of the natatory legs is much broader than the sixth ; 

 the male pleopods of second pair have their proximal part completely fused in the median line, and 

 the copulatory organs moderately elongate; the uropods are long. For the reception of M. occanica 

 TatL the generic name Paramunnopsis is proposed. 



Munnopsis nustralis Beddard has by Tattersall been taken as type for his genus Munimfsoidct, 

 to which he also referred his new species M. lieddardi TatL Supposing that Af. auslralis in the main 

 features agrees with my M. eximius n. sp. (described later on) these three species show the following 

 features. They agree with Afunnopsis lypica and differ from I'aramunnopsis n. gen. in having no molar 

 process and the setae rudimentary on the mandibles, and, besides, in the fact that the three posterior 

 thoracic segments and the abdomen are immovably fused ; they differ from both in some features, viz, 

 the mandibles have no palp, the anterior thoracic segments are very broad and the posterior very narrow, 

 the fifth segment even extremely narrow, the natatory legs have the two distal joints very- narrow, 

 and the uropods are very short But in one most interesting feature the two species M. Bfddardi TatL 

 and M. eximius n. sp. are very different In M. eximius and therefore, according to the above-named 

 supposition, in Af. australis Bedd., the male pleopods of second pair are quite independent, and the free 

 part of their copulatory organ more than twice as long as the pleopod (PL XIV, fig. an); in the male 

 <>f .I/. Bfddardi TatL the same pleopods are fused to such a degree that they constitute a single large 



plate (PI. XIV, fig. 3k) with a posterior oblong incision, in which are found the two copulatory organs, 

 TW Ufotf&pWitM. in. |. 



