oaa CRUSTACEA. 



Length of carapax, eight and a half lines ; breadth, eleven lines ; 

 ratio of length to breadth, 1 : 1-3. The front has a very slight 

 trace of an emargination either side of the middle, although none 

 at middle, and with this exception is entire; it does not pro- 

 ject at all forward of the line of the orbits. The medial region 

 is somewhat prominent, the areolets 2 M and 3 M being distinct, so 

 also the cardiac, and several of the anterolateral areolets, although 

 none are very well defined. The surface of the carapax is granulous, 

 especially about the upper part of the areolets and along the margins. 

 The antero-lateral teeth are alternately acute, or appear to have a 

 spiniform termination. These alternate, acute teeth are the first, 

 third, fifth, seventh, ninth, and they correspond to the normal teeth, 

 D, E, N, T, S ; the first four normal teeth being double, make up the 

 number nine. The outer antennae are nearly half as long as the cara- 

 pax, the basal joint of this pair is quite broad and prominent, some- 

 what above the orbit. 



Family II. TIIIID.E. 



Genus KRAUSSIA, Dana. 



Thia3 affinis. Carapax fransversim ci*emdato-Uneoliiti* 9 fcre orhlcuJatne, 

 margine antero-hderali mttlto long lore quam pfMerct-htfcndi*, dentato 

 aid denticulate. Pedes antlci mediocre*, dit/ifis hishtr corfdearis ex- 

 cavatis. Pedes 8 postlci tarso emifvrmi co/ifixti. Artictdits umxil- 

 lipedis extend ?>tius parvidus, artlcxdum pvoxlmum angulo htferno 

 excavato ferens. Antenna] iidennv valde ohllqiicr, externa hreve^fere 

 nudce. 



Near Tlda. Carapax transversely crenulato-lincolate, nearly orbi- 

 cular, antero-lateral margin much longer than postero-lateral, den- 

 tate or denticulate. Anterior feet of moderate size, finger spoon- 

 like at extremity. Eight posterior feet with an cnsifbrni tarsus. 

 Third joint of outer maxillipeds small, bearing next joint at inner 



