GENNADAS PASITHEA. 147 



by a semicircular emargination, and two smaller lateral 

 lobes tbat are separated from the former by a deeper but 

 narrower notch and each of which ends in a narrow tooth 

 or spine. At either side of the median line and contiguous 

 to it are situated two tubercles or prominences behind one 

 another and, between them, at either side of the median 

 line, a small, compressed, narrow tooth or lobule, with 

 rounded tip; the anterior tubercle is conical, obtuse, the 

 posterior longer and narrower. 



Thelycum consisting of a horizontal plate between the 

 three posterior thoracic legs, rounded anteriorly, while the 

 less broad posterior margin is also rounded; antero-lateral 

 margins upstanding and thickened near the coxae of the 

 4<f» legs. 



Male long 41™™.^ female a little smaller. 



Note: The above paper contains the diagnoses of 19 

 new Species and of 1 new Variety, mostly belonging to 

 the Family Peneidae. The Macrura, collected by the »Siboga- 

 Expedition", are at present at lerseke, but will be trans- 

 ferred to the Zoological Museum of the university of Am- 

 sterdam, as soon as they have been worked out. 



lerseke (Holland), August 1907. 



Notes from the Leyden Miuseum, Vol. XXIX. 



