CRABS AND LOBSTERS. 151 



these spines, wherever fixed, agree in having red points. But 

 these particulars are not sufficient by themselves to distinguish 

 this species from certain of its congeners, and I am compelled 

 to ask my readers to enter into some minute, and I fear to 

 them, tedious details of description. Of the various appen- 

 dages to the segments comprised in the head of these crusta- 

 ceans, some constitute the eyes, antennae, and jaws. Outside 

 the jaws, and immediately between the pincer-claws of 

 squamifera, is a pair of appendages called the third pair of 

 maxillipeds or footjaws, with long hairy fringes to the extrem- 

 ities. Study these carefully, for from these we can tell at 

 once which of three species we are looking at. Each of these 

 mouth-organs, like the larger legs, is made up of seven joints ; 

 but it is not always easy to reckon these up from the base, 

 because sometimes a joint is hidden or coalesces with another. 

 If now we commence at the other end, calling the top-joint 

 No. 7, and reckoning backwards, we shall have less difficulty. 

 To save further description, and to make easy of reference, I 

 have drawn up a table of distinguishing features for the British 

 species of Galathea : 



Third footjaws (maxillipeds} with ^ 

 3rd joint shorter than 4th ,- squamifera 



,, ,, longer than and J 



- 



- 



3rd joint longer than 4th I dispersa 



r0m eUher { *nd joint longer than 3 rd } str&sa 



The Spinous Squat-lobster (Galathea strigosd) has spines on 

 his hands along both the inner and the outer margins ; and the 

 antennas are so long that if extended over the back they will 

 reach for some distance beyond the tail. Its colour is inclined 

 to red, with spots and lines of blue. These are the only two 

 we are likely to find in our stone turning, and even strigosa 



