33 



THE CRUSTACEA 



PALAEONTOLOGY. 



The oldest undoubted Stomatopods are found in the Jurassic 

 rocks of Solenhofen, and are referred to the genus Sculda, Miinster, 

 differing in many details from the living forms. Species referred to 

 the genus Squilla occur in the Cretaceous deposits of Westphalia 



-a,' 



FIG. 1!>4. 



Young larva of the Alima-type. a', antennule ; a", antenna ; ai-o 5 , pleopods ; I, II, first 

 and second thoracic limbs ; 6-8, last three thoracic somites. (After Brooks, from Korschelt 

 and Heider's Embryology.) 



and the Lebanon, in which latter larvae of the Erichthus-type have 

 also been recognised. Species of Squilla also occur in the London 

 Clay and other Tertiary deposits. 



AFFINITIES AND CLASSIFICATION. 



Perhaps the most aberrant character of the Stomatopoda, and 

 one which separates them not only from the other Malacostraca 

 but from all other Crustacea, is the presence of distinct and 



