270 



Observations on Mr. Hailstone's Porccllana, 



whether on the right or left side, 



highly magnified, taken 

 from c, and this organ 

 presents no difference 

 in the young and adult 

 states, except in being of 

 a comparatively larger 

 size. It is impossible to 

 give an adequate idea, upon 

 so small a scale, of the 

 beautiful appearance which 

 it exhibits under a high- 

 powered lens, arising from 

 the exceeding delicacy 

 of the ciliated hairs, e 

 shows the natural length 

 of Mr. Hailstone's largest 

 specimen *, with the tail 

 extended ; f, the larger 

 of the claws of this speci- 

 men, considerably magni- 

 fied. The smaller one, 

 differs from the other in 



form, being more slender, and broadest at the place of inser- 

 tion of the thumb. In the large specimens the centre of the 

 anterior margin of the shell is so much depressed, that its 

 extremity only can be seen as represented in g : this is mag- 

 nified about four times the natural width. In all the speci- 

 mens, two impressions exist behind the middle of the shell, 

 which are often differently coloured from the remainder. 



No more acceptable service could be rendered to crusta- 

 ceology than by showing, as Mr. Hailstone has done, the 

 gradual changes which take place in the different species of 

 crabs, the subject being quite uninvestigated. — J. O. West- 

 wood. The Grove, Hammersmith, March 12. 1835. 



[Notices of another Species of Pontophilus, and of a Crustacean 

 altied to the Genus Hippolyte ; by S. Hailstone, jun., Esq.~] — 

 I send descriptions and drawings of two species of Crustacea 

 which I cannot find mentioned in any book I have access to. 

 I have made drawings of them, from finding the communi- 

 cation of the specimens to be so hazardous. I have used 

 every care in their delineation, and nothing has been done at 

 random : the drawings exactly represent the specimens in my 



* The specimen previously figured {Jig. 28.) is about half way between 

 the large and small specimens ; and yet Mr. Hailstone states it was found 

 with spawn. This is a curious circumstance. 



