Streetsia. 



81 



described, must be placed in this genus; I am myself inclined to con- 

 sider Leptocotis mindanaonis, Stebbing, really to be a Streetsia, but 

 following the rule of not uniting an already established genus or spe- 

 cies with another without full evidence, I shall for the present content 

 myself with giving a diagnosis for distinguishing it from the species 

 of Streetsia. 



Beside the typical species Streetsia Challengeri the following 

 species are to be recorded here, viz: S. porcellus, Claus, S. longi- 

 ceps, Claus, S. pronoïdes, C. Bovallius, S. Steenstrupi, C. Bo- 

 VALLius, and S. carinata, n. sp. They are to be distinguished as shows 

 the following synoptical table: 



A. The last ural segment is shorter than the telson. 



a 1. The lower hind corner of the femur of the sixth 

 pair of perseopoda is produced into a long, sliarp- 

 pointed process. 



a 2. The lower hind corner of the femur of the sixth 

 pair of perœopoda is produced into a short, round- 

 ed process. 



B. The last ural segment is about as long as the telson. 



b 1. The under margin of the carpus, and the hind 

 margin of the metacarpus of the first pair of 

 perseopoda are serrated. 



bb 1. The dactylus of the first and second pairs 

 of perseopoda is much shorter than half 

 the metacarpus. The femur of the se- 

 venth pair is longer than all the follow- 

 ing joints together. 



bb 2. The dactylus of the first and second pairs 

 of perseopoda is longer than half the 

 metacarpus. The femiu* of the seventh 

 pair is much shorter than all the follow- 

 ing joints together. 



b 2. The under margin of the carpus, and the hind 

 margin of the metacarpus of the first pair of perseo- 

 poda are smooth. The dactylus of the first pair 

 is not half as long, that of the second pair is 

 half as long, as the metacarpus. The femur of 

 the seventh pair is a little longer than all the 

 following joints together. 



Nova Acta Reg. Hoc. Sc. Ups. Ser. IIL 



1. S. Challengeri. 



2. S. porcellns. 



3. S. pronoïdes. 



4. S. carinata. 



5. S. Steenstrupi. 



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