JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATE XX, 



Illustrating Professor Ray Laukester's memoir on the 

 " Appendages and Nervous System of Apus cancri- 

 formis." 



lu all the figures the following letters have the significance here attached 

 to them : 

 Ax. Axis or corm (Pkotopodixe) of the appendage. 

 Ax^ to Ax"^. Pirst, second, third, and fourth segments of the corm. 

 Ax^ and Ax', in Fig. 7, are the equivalents of Ax^ in Fig. 8 ; and Ax^ and 

 Ax* in Fig. 7 of Ax- in Fig. 8. 



Ax^, in Fig. 7, is the equivalent of tlie Coxopodite of higher Crustacea. 

 Ax"', in Fig 7, is the equivalent of the Basipodite of higlier Crustacea. 

 E)i^. Proximal endite (proximal ventral apophysis) or gnathobase. 

 Eri?. Second endite, or second ventral apophysis. 

 E)i^. Third endite, or third ventral apophysis. 

 En*. Fourth ditto. 

 Eii^. Fifth ditto, the Endopodite. 

 En^. Sixth ditto, the Exopodite. 

 P. Sub-apical lobe of the corm. 



Fl. Distal exite (dorsal apophysis), or flabellum (Epipodite). 

 Br. Proximal exite, or bract (branchia). 

 N.B. — All the figures are drawn to the same scale, excepting Figs. Iff. 

 7 a, and 14, and all the appendages are those of the right side seen 

 from the posterior face, except Figs. 3 a and 4 a. The plumose cha- 

 racter of the finei' setaj is not rendered, except in Figs. 6 and ]3. 

 Fig. 1. — First prajoral appendage, or first antenna. 

 Fig. 1 a. — Enlarged view of the termination of another specimen with 



four terminal seta;. 

 Fig. 2. — Second prseoral appendage, or second antenna. 

 Fig. 3.— Mandible. 



Fig. 3 a. — Mandible revolved on its long axis (anterior face). 

 Fig. 4. — Maxilla anterior piece. 

 Fig. 4 a. — The same piece reversed (anterior face). 

 Fig, 5. — Maxilla posterior piece (gnathobase). 

 Fig. 6.— Maxillipede. 

 Fig. 7. — First thoracic foot. 



Fig. 7«. — Enlarged view of the sixth endite of the first thoracic foot. 

 Fig. 8. — Second thoracic foot. 

 Fig. 9. — Seventh thoracic foot. 

 Fig. 10. — Eleventh thoracic foot (oostegopod). 

 Fig. 11. — First abdominal (post-genital) foot. 



Fig. 12. — Abnormal thirtieth abdominal foot, with two flabella and rudi- 

 mentary bract. Fir. Second or additional flabellum. 

 Fig. 13. — Fifty-second abdominal, or sixty-third truncal foot (sixty-sixth 

 post-oral appendage, sixty-eighth or last appendage of^the entire series). 

 Fig. 14. — Setae from the apophyses : a and b, lateral and full views of the 

 short setse on the endites 2 to 5 of the appendages, drawn in Figs. 9, 

 10, and 11 ; c, longer setae from the gnathobase of the maxillipedes 

 and the margin of the sub-apical lobe and flabellum. 



