30 



R. E. Lloyd : Remarkable Cases of Variation. [Vol,. II, 



Type. 



I 



2 



o 

 J 



4 

 5 

 6 



7 



8 



9 



10 



II 



Teeth present in type. 











Numbe 



r of individuals of 



Left claw. 



Right claw. 



the type. 



lO 



16 





I (figured, pi. iii). 



13 



13 





3 



14 



13 





I 



14 



14 





2 



15 



15 





2 



i6 



15 





I 



i6 



16 





3 



i6 



17 





I 



17 



16 





I 



17 



17 





I 



17 



18 





I 







Total 



17 



Besides this great variation in the number of teeth, their cur- 

 vature and proximity one to the other are very variable. It was 

 thought well to illustrate them fully (plate ii). The dactylus, 

 in each case, was drawn under a low power of the microscope b3^ 

 the aid of the camera lucida. The resulting outline drawings, 

 which were each twelve times the size of the object they represented, 

 were reduced in the process of reproduction to more convenient 

 dimensions. By these means accurate figures were obtained. 



Owing to the great similarity of all their other features and 

 to the fact of their community, they were regarded as one species 

 and described as such under the name Squilla investigatoris 

 {Rcc. Ind. Mus., i, p. 10), though it is impossible to sa^^ whether 

 the species has 13, 14, 15 or 16 teeth on its claw. Perhaps if 

 larger numbers were available, a clear majority' might be found 

 to possess claws bearing teeth to the value of only one of these 

 numbers. A remarkable feature of this variation is that it occurs 

 in an organ which is very stable in other species of the genus. 



The genus Squilla has been defined as having no more than 

 six teeth on the raptatorial claw, but in spite of this there can be 

 little doubt that this variable species has been correctly assigned 

 to the genus Squilla. 



In his report on the '' Challenger " Stomatopoda Brooks defines 

 the genus as follows : — • 



2. Dactyle of raptatorial claw not 

 dilated at the base, but usually 

 armed with marginal spines. 

 ( I ) Primary marginal spines of the • ' 



telson small, with no more - 



than four secondary spines ■ 



r between the submedian and 



the intermediate ; outer . ". : 



