NO. 1367. XI'J 1 1 ' SPFJ'IKS OF ( R I ST. I f'EA XS—P, F.XKI) ]< T. { > 2 5 



that near the peduncles the hairs protect the passage from every side, 

 while beyond the flag-elli form tlie long leaders of this natural weir. 

 It is evident that particles can l)e gently guided along l>(>tMccii the 

 leaders until within range of the mouth part or the hands. Anothei 

 factor which may assist in keeping the region about the mouth ])iirty' 

 free from sand, is the iiow of water from the branchial chamhcrs. 



Placed in the sand in this position facing the beach, the antcnnuhc 

 could readily guide any of the little synaptas, worms, or small Crus- 

 tacea washed up by the waves and l)rought l)ack ])y the rcn-eding water, 

 and as the wave advances it would not ))e at all impossible for the 

 antennuhv to l)e reversed and so add to its chances by working the 

 adAancing wave. But this may not be the only way the antennulte 

 can l)e used, for if the animal ])acked into the sand the antennulje 

 would be placed together, and here again the bristles would be eflfective 

 in keeping a passage between them free from sand, and s3'naptas, 

 worms, etc., moving in the sand would lind it easy to enter the pas- 

 sage while egress at the sides would be impeded by the hairs ))acked 

 with sand. 



ALBUNEA GIBBESII Stimpson. 



Albunea gihbesti Stimpsson, Ann. Lye Nat. Hif^t. New York, VII, 1862, j). 7S, pi. i, 

 fig. 6. — ^IiERs, Journ. Linn. Sue. l^ond., XIV, 1879, p. ;)29. 



Several specimens of this species are in the collection from Ke}' 

 West, Florida. One line specimen was taken at Santa Rosa Island, 

 oft' Pensacola, Florida, 

 where it was taken in com- /1\ 



})any with ^1. o.ryopthalino. jmt>^A,}^sM^M). 



The eyes can not be relied ' 



K... ..-A.Bc>^. oxBBKsu. ^,^ ^^ distinguish ^,Me.u ^'^■^^^'■'.r' 



from oxyopthaliiKi. The 

 terminal segment of the abdomen of ^l. (/Ihbesil is '" narrow and sicumi- 

 nate at its extremity, forming a long, narrow projection." as described 

 and tigured by Dr. Stimpson. The dactyles of the second and third 

 pair of feet dift'er in having a wider projection than in tin' rclaicd 

 species. 



