AC A.] 



CRUSTACEA. 



525 



SUBCLASS PODOPTHALMATA. 



Order Phyllocarida. 

 Family Ceratiocarid^e. — Ceratiocaris, Colpocaris, Echinocaris, Elymocaris, 



Ribeiria (?), Solenocaris, Tropidocaris. 

 Family Discinocarid^. — Dipterocaris, Spathiocaris. 

 Family Pinacarid^. — Dithyrocaris, Mesothyra. 

 Family Protocaruxe. — Protocaris. 

 Family Rachurid^. — Rachura. 

 Family Rhinocarhxe. — Rhinocaris. 



Order Decapoda. 

 Family Anthracarid^e. — Anthrapalsemon. 

 Family Caridid^s. — Palseopalsemon. 

 Family Pal^ocarid^. — Ganipsonyx, Palseocaris. 



Order Tetradecapoda. 

 Family Arcileocarid.e. — Archseocaris. 



ACANTHOTELSON, 



Meek & Wor- 

 then, 1 860, 

 Proc. Acad. 

 Nat. Sci., p. 47. 

 [Ety. akantha, 

 spine ; telson, 

 end.] Superior 

 antennae as 

 long as the in- 

 ferior, fiagella 

 longer than the 

 peduncles; 

 head about the 

 length of the 

 two anterior 

 thoracic segments; thoracic and 

 abdominal segments about the 

 same length ; anterior thoracic legs r t*h o"t e fao 1 ^ 

 longer than the others ; telson sim- Btimpsoni. 

 pie, long, spine-like v , laterally com- Dorsal view, 

 pressed ; stylets with second segments longer than 

 first, and similar to the telson. Type A. stimpsoni. 

 eveni, Meek & Wortben, 1868, Am. Jour. Sci., vol. 



Fig. 947. — Acanthotelson eveni. .4, dorsal view; si, stylet; t, 

 telson; B, side view; a and x, antennae; /, anterior leg; 

 C, enlarged stylet. 



Fig. 919.— Acan- 



Fig. 948.— Acanthotelson eveni. 

 Enlarged ; H, anterior legs and 



antennae; 8, punctures left by Fig. 950.— Acanthotelson stimpsoni. Enlarged 3 diam.; 

 spines on the lower side. t, a protuberance that may be an eye. 



46, p. 28, and Geo. Sur. 111., vol. 3, p. 

 551, Coal Meas. 



Acantholoma, syn. for Acidaspis. 

 spinosa, syn. for Acidaspis tuberculata. 



