26 - Mr. C. Spence Bate on the Genus Palinurus. 
observing a woman shrimping on the sandy beach, we requested 
to have a look at the contents of her bag, and were delighted to 
find, amongst a small catch of the common Shrimp, numerous 
specimens of Pagurus Dillwynit. After purchasing her entire 
stock, we hastened to the beach, and, within the margin of the 
incoming tide, took numerous specimens, which we kept alive 
for a short time. This, the prettiest of all the pretty genus, has 
the habit of burrowing in the sand; and it is probably owing to 
this circumstance that the animal has not been met with more 
frequently. But, curious to relate, since it has been found at 
Teignmouth, we have dredged it, in about 4 fathoms of water, 
in Bigberry Bay, and also taken a single specimen, in about 
6 fathoms, as near to Plymouth as the mouth of the river 
Yealm. 
An interesting point in the history of the development of this 
genus we have been enabled to make out : it is about the last 
week of April or the first of May that the larva appear most 
abundantly to quit the ova. arly in June we were enabled to 
capture many specimens of the young animal in various degrees 
of progressive development—a circumstance that has enabled us 
to determine that the genus Glaucothoé, founded on G. Peroni, 
and described by Prof. Milne-Edwards in the ‘Ann. des Se. 
Nat.’ for March 1830, is none other than an immature stage of 
the genus Pagurus, at which period the little creature possesses 
all the characters of a Macrurous Decapod, and swims freely in 
the ocean, until, obliged by increasing age to take refuge in the 
cast-off shell of a univalve Mollusk, it smks to the bottom, and - 
commences life as a Hermit Crab. 
Macrura. 
In the genus Palinurus exists a curious and interesting struc- 
tural condition of the mferior pair of antennz, which, I believe, 
has never been pointed out. 
In all Macrurous Decapoda the inferior pair of antennz is 
furnished with a scale or articulated process (scaphocérite of 
Milne-Edwards), which is invariably situated at the distal ex- 
tremity of the third joint of the peduncle. Now, in Palinurus 
this scale or squamiferous appendage is so incorporated with 
the wall of the peduncle as to exhibit its form on the surface 
only, thus demonstrating that the third and fourth joints of 
the peduncle are fused together; and the lateral scale is incor- 
porated with it also. PI. II. fig. 3¢. 
Crangon. 
In the elaborate memoir of the late Prof. Kinahan on the 
genus Crangon (Trans. Royal Irish Acad. vol. xxiv. p. 46) we think 
