CRUSTACEA. 



107 



Eurystiieus erytiirophtiiatmus. — LAlgeoory, in ofvers af Kongl. 

 Vet. Alcad. Zorhandl, 1855,^?. 124. 

 Not uncommon in Plymouth Sound, and it has been sent to us, 

 among other places, from Banff, by Mr. Edward. 



Genus, Amatiiilla. — Bate and Westwood, p. 459. 



Head produced to a sharp point. Antennae rather short. First 

 pair with a second branch. Hands small, subequal. Back carin- 

 ated. Tilson entire, slightly emarginate at apex. 



Amathilla sabini. — Leach, Bosse's First Voyage, oet. ed., ii,p. 178. 



This is an arctic species. First taken in Baffin's Bay by Genl. 

 Sabine, during Rosse's first expedition. It has since been found 

 on all the northern places where naturalists have dredged, both 

 on the European and American coasts. Those from the Arctic 

 seas and the coast of Scotland are large, being about an inch in 

 length, but the size appears to diminish in regular proportions as 

 it progresses southward. In Shetland and the Moray Frith it is 

 scarcely as large as the Arctic specimens. At the Menai Straits 

 it is scarcely half as large, and on the south coast of Cornwall it 

 appears to have reached its minimum size, as it has not been 

 recorded further south. It will be found in rocky pools near low 

 water mark occasionally everywhere. 



Genus, Gammarus. — Fabricius. 



Three posterior rings of the body furnished with bundles of 

 short spines. Eyes long, narrow, or curved. Antennre slender, 

 with a short second branch. Hands not large, subequal. Telson 

 double. 



Gammarus marinus. — Leach, Lin. Trans , xi, p. — Bate and West- 

 wood, p. 370. 



The colour of the animal is olive- green. They are very gre- 

 garious, and live amongst the seaweed on our shores, and frequent 

 estuaries a considerable distance from the mouth of every river. 



Gammarus campylops. — Leach, Edin. Ency. — Bate and Westwood, 

 p. 375. 



This species is named from the crooked shape of the eyes. It 

 appears to be an intermediate form between G. marinus, and 

 locusta. It is not very common, but it lias been taken among 

 other places in riymouth Sound. 



