lÖO CRUSTACEANS OF THE 



(I.e.) under the name of Telph. sinuaiifrons , but they 

 ought to be considered as a new species, though bearing 

 a close resemblance to the former, three type-specimens of 

 which are lying before me (confer p. 92). Fot. consobrinum 

 differs 1° by the still more depressed and flattened cephalo- 

 thorax, 2° by the different shape of the front, 3° by the 

 more enlarged joints of the ambulatory legs and by the 

 shorter dactylopodites. ') 



The two specimens, collected at localities rather far dis- 

 tant from one another, though certainly belonging to one 

 and the same species, do not fully agree, so that I 

 prefer to treat of them separately. As the female bears a 

 closer resemblance to Pot. sinuatifrons than the male does, 

 I will describe it in the first place. 



With regard to the proportion of the measurements of 

 the carapace, the female fully agrees with the types of Po^ 

 sinuatifrons. The front, however, is very little deflexed, 

 still less than in this species, and it appears a little 

 broader in proportion to its length. The upper 

 margin of the orbits has namely a different direction (Fig. 

 10* and Fig. 10<^) ; its superciliary portion, forming the 

 lateral margin of the front, makes a very obtuse angle 

 with the adjoining middle portion of the margin and this 

 middle portion runs very slightly backwards before 

 curving towards the external orbital angle. In the types of 

 Fot. sinuatifrons^ however, the lateral margins of the front 

 pass constantly with a regular curve into the middle por- 

 tion of the margin (Fig. 9 and Fig. 9*) and this middle 

 portion runs transverse ly outwards or even slightly 

 forwards; the lateral margins of the front are compara- 



1) Milne Edwards (in: Annales Sciences Nat. 1853,. T. XX, p. 211) says 

 that Th. sinuatifrons «ressemble au Tfi. fiuviatilis par sa forme générale". This, 

 however, can hardly be said. When I compare specimens of the European species 

 from the river Sarno near Naples with the types of Pot. sinuatifrons, the 

 carapace of the latter appears more enlarged and more flattened, the 

 extra-orbital tooth has a quite other shape and direction, the antero-lateral 

 margins are more finely denticulate, the front has a difTerent form and is but 

 finely granular and there are still more differences. 



JNotes from the Leyden Museu-ixi, Vol. XXT . 



