Thompson.— A Rare Thalassinicl. 
PLATE 2. 
Fig. 20. Second larval stage ; leftside. X 37. mxp 3 , third maxilliped; mnd r 
mandible ; eg, liver ; lit, heart; ch int, chitinous gut; int, achiti- 
nous gut; r, rostrum ; a n antennula. 
Fig. 21. Thorax of fourth stage ; right side. X 30. pr 1? first pereiopod ; pr 5 , 
fifth pereiopod ; ao, aorta. 
Fig. 22. Thorax of third stage; right side. X 30. pi\, first pereiopod ; mxp 15 
first maxilliped. 
Fig. 23. Fifth stage; left side. X 20 (?). pr 5 , fifth pereiopod; sc, scapho- 
cerite of antenna; int, achitinous gut; aa, antennary artery ; t, 
telson. 
Fig. 24. Third maxilliped, fifth stage, mbpb, mastigo-podobranch rudiment; 
ex, exopod ; en, endopod. 
Fig. 25. Head of fourth stage; dorsal side. X 26. ao, aorta. 1 
Fig. 26. Fourth joint of third maxilliped; adult. 
Fig. 27. First adolescent stage; right side, showing manner of .carrying 
cheliciped. X 70. pr n cheliciped; pr 2 , second pereiopod ; mxp 3 , 
third maxilliped ; sc, cervical groove. 
Fig. 28. Mandible of adolescent; ventral side. X 42 (?). 
Fig. 29. Pleopod of adolescent. X 20. 
Fig. 30. Gill rudiments of fifth stage. mxp 2 , second maxilliped; pr 15 chelici¬ 
ped ; ab 4 , arthrobranchs of fourth pereiopod ; mbpb 2 , common rudi¬ 
ment of mastigo-podobranch of second pereiopod. 
1 The endopod of the antenna is incorrectly drawn; it should be naked and 
longer than the exopod. 
