188 EVENINGS AT THE MICROSCOPE. 



Lobsters : I mean Galathea. The adult animal is of a 

 broad squat form, something like what you might suppose 

 a Lobster to be, if it had been flattened between two 

 stones, without being actually destroyed. We have two 

 or three species, one of which is adorned with brilliant 

 scarlet and azure paintings ; but I cannot tell to which of 

 them all this infant form belongs. 



ADULT SHORE-CRAB. 



You perceive that there is a general similarity between 

 these transparent little creatures and the Zoea described by 

 Mr. Couch ; but there are great differences in detail. 

 The glassy shield or carapace shoots out in front in a stiff, 

 inflexible, very fragile spine. This is perfectly straight, 

 and nearly thrice the length of the whole shield. It is 

 beset, on various lines on its surface, with short slender 

 spinules jointed to shoulder-like angles, and not serratures. 

 Its interior is perforated by a canal which dilates and nar- 

 rows irregularly. The carapace posteriorly is semi-oval, 

 projecting a transparent convex vault over the part where 



