I. Assll ! ATIo\. 



ivied. Cups slightly pedicelled. A pair of aquiferous 

 poivs at tin 1 upper hinder aiiult- of the eye. 



SUB-ORDER II. DECAPODA. 



^4. Dec.npoda c7iondroph<'<i. Infernal shell horny. 



a. Myujmidtr. Eyes covered by th? skin. : in<m1hj littoral species. 



Family 4. LOI.HMM U.K. Uody rather long; buceal skin some- 

 times armed with suckers ; tentacular arms only partially retrac- 

 tile; tins lateral-terminal. Inner shell or o-ladius as hum- as the 

 back. 



Family 5. SKIMMI.I I..K. Uody short; buccal skin without suck- 

 er-: tentacular arms completely retractile: tins short, in the 

 middle of the sides of the back. Gladins only about half as 

 long as the body. 



b. Oigopsida 1 . Eyes naked : pelagic species. 



Family 0. CiiANriniD^E. Body rounded ; mantle united to the 

 head by a cervical band, and upon either side connate with the 

 of the siphon: head small, with larire eyes: arms short; 

 tentacles huiir: siphon lon<r. not fastened to the head, and with 

 or without inner valve. Shell as long as the body, small, 

 lance-like. 



Family 7. Cn IUOTKI TII i iu:. IJody rather Ion i: : mantle sup- 

 ported on the body by cartilaginous ridges; sessile arms, lon^'. 

 partially \vebbe(l : tentacles very long; siphon short, without 

 attachment to the head or valve. Shell or Radius small, loni:, 

 lance-like. 



Family s. Til YSA.NOTKI TII i I>.K. IJody rather loniLT <>r oval: 

 mantle supported by <-ai1 ila^inons riduvs and grooves; arms 

 free; siphon united to the head by t \vo b.-inds. (Jladins dart-like. 



Family '.i. ( )VVCHTKI TIIID.K. IJody lonr. cylindi'ical : mantle 

 supported by cai t ilaLrinous j.roject ions ; eyes with a lachry- 



mal-inn-; arms or tentacles armed with hooks; siphon with or 

 without bands and valve. (Jladius ^enerally lancet-form, with 

 an end-conns. 



Family lo. ()MM\-TI;II- ..... .r. F.ody lonn. ey liixli'ical ; arms 



-hort. armed with -nekei s only : the short, tentacular arms non- 

 retraetile : >i|.hon valved, united by bands to the head. Shell 

 small, lancet-form, with an end-conn-. 



