g-^ Abdominal terga not at all prominent. 



//j Anterior extremity of sternum with a deep tri- 

 angular notch. 

 t\ First abdominal somite with a dark, oval spot 

 in the middle. Calcified portion of the telson 



terminating in four teeth sordidits (Stimps.) 



«j First abdominal somite with no dark, oval spot 

 in the middle. Calcified portion of the telson 

 terminating in two teeth pumilus Nob. 



(G. NOBIU, Faune Carcinolog. de la Mer Rouge, Decapodes et Stomatopodes, 

 1906, p. ?,j). 



k„ Notch at the anterior extremity of sternum not deep 



and triangular, but presenting only a minute 



incision in the middle of the truncate, jiosterior 



margin. 



z'j Carapace with 2 teeth in the middle line before 



the cervical groove and with 2 minute teeth, 



situated abreast, between the posterior tooth 



and that groove. Of the five teeth on the inner 



edge of the proximal (outer) antennal squame 



the first is much larLTcr than the followinsf. 



A species of small size bictispidatits (de Man) 



z'o Carapace with 3 teeth in the middle line before the 

 cervical groove, the pair of minute teeth between 

 the posterior tooth and that groove wanting. 

 Of the five teeth on the inner edg-e of the 

 proximal (outer) antennal squame the second 

 is the largest and the difference between this 

 tooth and the following is not so great. A 



species of large size arctiis (L.) 



(H. Milne-Edw.\RDS, Hist. Nat. Crustaces, II, 1837, p. 282). 



g„ One of the abdominal terga much more prominent 

 in the middle line than the others. 

 h^ Third abdominal tergum more prominent than 



the rest Marfcnsii Pfeffer and rngosns Latr. 



(H. Milne-Edwards, Hist. Nat. Crustaces, II, 1837, p. 283). 



/i^_ Fourth abdominal tergum more prominent than 



the rest gMerosiis (de Man) and yodi/il (de Man). 



The name Xobilii was proposed by me in 1905 (in: Tijdschr. Ned. Dierk. Vereen. (2) 

 Dl. IX, p. 5 89) for a new species from the Persian Gulf, which by a lapsus calami had been 



