CRABS AND SHRIMPS. 



217 



destroyed. AVe have two or three species, one of wliich 

 is adorned with hriUiant scarlet and azure paintings ; 

 but I cannot tell to which of them all this infant form 

 belonijs. 



You perceive that there is a general similarity be- 

 tween these transparent little creatures, and the Zoea 

 described by Mr. Couch ; but there are great differ- 

 ences in detail. Tlie glassy shield or carapace shoots 

 out in front in a stiff, inflexible, very fragile spine. 



ADCLT SnOEE-CRAB. 



Tliis is perfectly straio;ht, and nearly thrice the lens-th 

 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 perfo- 

 rated by a canal, which dilates and narrows irregularly. 

 Tlie carapace posteriorly is semi-oval, projecting a trans- 

 parent convex vault far over the part where the ab- 

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