CHA1>. V 



M ALACOSTRACA LEPTOSTR AC A 



I I I 



SERIES 1. LEPTOSTEACA. 



Division. Phyllocarida. 

 The small shrimp -like Crustacean Ncbalia, which is found 



burrowing in the 

 superficial layers 

 of sand in the 

 littoral and some- 

 times the deeper 

 regions of most 

 seas, has been re- 

 garded, -ever since 

 its anatomy was 

 made out by Claus, 1 

 as a connecting 

 link between En- 

 tomostraca and 

 Alalacostraca, and 

 has been placed in 

 a separate group 

 Leptostraca. 



The segmenta- 

 tion of the body 



A.I 



s 



save that two extra 

 segments are pre- 

 sent in tin' abdo- 

 men,and the paired 

 compound eyes are 

 borne, upon stalks. 

 The eight thoracic 

 limbs are all very 

 similar; they are 

 built on the typi- 

 cal biramous plan, 

 and each carries a 



.-R 



MX 



KM;. 7'">. .\I-IHI! In </>".""'".'/'', 

 9 , x -20. A.I. '.I '.'.'. 1st 

 :m<l 2inl antennae : .I/'. /, 

 Ab.6, 1st junl titli abdo- 

 minal appendages ; .1 .<'. 

 aiitciinary x\:\\\d : < ', lull' 

 nlY:uitl;il lurk : !'.. r\ > : <i, 

 vi-ntr.'tl L'aiiL'liniiii' cliain ; 



//, lir:u t ; /. intestin : /.. 

 iip|"-r liver-diverticnlum : 



.)/, ail'lu'-tur iiniM-li' (it 



halves M| ,-;n;l]i:l. r ; .)/ A . 



|i:il|i of 1 si maxilla : 

 O, rival y ; /,', 

 (After Clan . 



bract ; they have 



been compared, owing to their flattened, expanded shape, i<> the 



1 C'laus, Arb. Tnst. Wien, viii., 1SS9, i>. 1. 



