1880.J NATURAL SCIENCES OF PHILADELPHIA. 183 



Carapax arcuate, front strong!}' depressed. Upper margin of 

 orbits but slightly sinuate and nearly transverse. Lateral angles 

 acute, the sides converging posteriorly, making the carapax widest 

 at the angles. Orbits below with a slight median fissure. Ej-es 

 terminated bj' a short conical style armed with pencil of hairs. 

 Meral joint of cheliped with the spines and rugse much less 

 prominent than in 0. ceratophthalma. Carpus internally' with a 

 denticulated tooth. Hands small, externally with depressed 

 granules, the lower margin finely serrate, the upper rounded and 

 without spiniform tubercles. Internally the hand is nearly smooth 

 except below where there are granules similar to those of the 

 outside. The stridulating ridge is ver}' near the fingers and is 

 crossed by numerous fine striae. The propodal joints of the 

 ambulator}' feet spined below, the dactyli of the second pair hair3\ 



Senegal! (Guerin"! ; Syria, Egypt (Edw.) ; Cape Verdes (Auct.); 

 Greece (Guerin). 



This is probabl}' the species described by Hasselquist (Iter 

 Palestinum, p. 433, 1T57) under the name Cancer anomalus^ but 

 he gives many characters which will appl}' to no known decapod 

 and so to avoid confusion I refrain from applying his name to 

 this species. McLeay, in Smith's Zoology of South Africa, men- 

 tions '■^Ceratophthalma cursor DeHaan," an expression not to be 

 found in the pages of that Dutch Carcinologist. 



8. 0. ryderi Nov. 



Carapax coarsel}^ granulate, the upper margins of the orbits 

 sinuate, transverse, lateral angles acute, sides arcuate, the carapax 

 being widest at the anterior third, as in 0. arenaria, the lateral 

 margins anteriorly finely serrate. 



Eyes not reaching the extremities of the orbits, terminated by 

 a minute spine. Chelipeds like those of 0. arenaria ; ambulatory 

 feet roughened by subspiniform granules. 



Natal! (E. Wilson). 



This species is closely allied to the Ocypoda arenaria of the 

 coasts of America, but is readily separated by the ocular spines 

 and the o-ranulations on the ambulatorv feet. It is dedicated to 

 m}^ friend, John A. Ryder, of the Academy of Natural Sciences of 

 PhiladeliDhia. 



