186 Rev. T. K. R. Stebbing on new 



from a figure o-iven in a memoir in the possession of Professor 

 ^lilne-Eclwards." That the first species of Seba should be 

 taken on the coast of Na])les, while the second comes from 

 South Africa, suggests the reflection that there must be whole 

 armies of sessile-eyed crustaceans yet to be discovered. 



The generic characters given for ISe/ta are as follows : — 

 " Slender, smooth ; antennte h'J»gj subcqual ; coxaj small, 

 four anterior deeper than the three posterior ; gnathojioda 

 uniform, subequal, chelate." The new species agrees with 

 Seba innominata in all these resjiects, except that the an- 

 tenna3 (at least in my specimen, which may be a very young 

 one) are not very long, and that the gnathopods, though 

 agreeing in general character, are not precisely uniform. 

 Tiie first are shorter than the second ; they have the thighs 

 more slender, the hands broader, and the intermediate joints 

 notably of less length. In both the infero-anterior angle of 

 the hand is produced, so as to be equal in length to the finger. 

 The first gnathopod is given in the figure as it and its fellow 

 a])])eared in the specimen ; but the reversed position of the 

 wrist, hand, and finger, pointing forwards instead of back- 

 wards, is not likely to be the natural position in the living- 

 animal. 



The last three pairs of pereiopoda differ from those of Seba 

 innominata in having the thighs broad, in the last pair with 

 a serrated edge, and in having the metacarpal joints strongly 

 developed and overlapping the wrists. The telson is small ; 

 the caudal appendages short, the rami of the second pair ex- 

 tending a little beyond those of the first and third. The name 

 proposed is Seba Saundersii, out of respect for W. Wilson 

 Saunders, Esq., F.R.S., for whom the marine treasures were 

 collected among which this little stranger, about an eighth of 

 an inch long, reached our shores. 



III. Out of the same sifting of sand and fragments which 

 yielded the Seba came a tiny Isopod, only a twelfth of an inch 

 in length, with a very striking resemblance, at first sight, to 

 the figure of Cymodocea armata in Milne-Edwards's ' Ilistoire 

 Natiirelle des Cnistac^s ' (pi. xxxi. fig. 16). The resemblance, 

 however, is only one of general outline ; for whereas the striking 

 feature in the Cymodocea is the triangular prolongation of the 

 seventh segment of the thorax, in the new species it is the 

 teiTninal segment of the abdomen or tail which is produced 

 beyond the caudal appendages into a large conical tooth. 



The body is smooth, with scale-like markings visible under 

 a lens over all parts of the skin. The abdomen is in two 

 divisions, the first retaining indications of three segments sol- 



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