300 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 antero-lateral 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. THIID^E. 

 GENUS KKAUSSIA, Dana. 



Thise affinis. Carapax transversim crenulato-lineolatis, fere orbiculatus, 

 margine antero-laterali multo longiore quam postero-lateralis, dentato 

 aut denticulate. Pedes antici mediocres, digitis instar cocldearis ex- 

 cawatis. Pedes 8 postici tarso ensiformi confecti. Articulus maxil- 

 lipedis externi Btius parvulus, articulum proximum angulo interno 

 excavate ferens. Antennce internee valde obliquce, externce breves, fere 

 nudce. 



Near Thia. Carapax transversely crenulato-lineolate, 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 ensiform tarsus. 

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





