190 CRUSTACEANS. 



not appear that this animal rambles at large like others of the restless 

 fraternity ; on the contrary, it always becomes an inmate of some of the 

 bivalve shells, dwelling there in peace along with the proper owner. 



On one occasion, I found a specimen with the body thick, nearly 

 circular, half an inch in diameter, the two claws and eight limbs rather 

 slender, and about as long in proportion as those of the preceding species. 

 Two red eyes in front, considerably apart, are scarcely elevated above 

 the margin. Between two of them two small forked antennae also 

 project, resembling those of the kind referred to ; the colour of the 

 whole animal is reddish. 



A long time elapsed before I could be sensible that the specimen 

 fed, though supplied with various animal substances. But I thought it 

 nibbled some of the green fucus. In six or seven months, however, it 

 fed readily upon mussel. 



This specimen proved a female. On the first of July augmenting 

 spawn was elevating the apron, which is remarkably large, and visibly 

 consists of seven segments. In a fortnight it protected a quantity of fine 

 vermilion capsules. Some of these, detached on the 15th, were seen to 

 be quite spherical, and very large. 



While the spawn still adhered to the parent, numerous young, now 

 swimming actively through the water, had escaped on the 26th. To the 

 eye they are very minute, and of yellowish colour. All lay motionless 

 in two days at the bottom of the vessel. 



Red internal spawn afterwards seemed to shine through the in- 

 teguments of the animal early in August. 



This creature was very timid, inactive, and extremely susceptible of 

 the influence of atmospherical changes. On the slightest shock the limbs 

 contracted ; it would lay supine and motionless, as if dead, or counter- 

 feiting death, for an extraordinary time. 



Some alteration in the aspect of the animal followed liberation of a 

 quantity of the spawn, as shewn by the figures. 



The creature survived fourteen months. When dead the integu- 

 ment, both back and breast, proved compact, flexible, and tough. 



