342 8. I. Smith — Early Stages of Hippa talpoida. 



Figure 3. — Same, megalops-stage, enlarged forty diameters; a. a', b, lobes of the pro- 

 tognath ; d, endognath ; c, scaphognatli. 



Figure 4. — First maxiUiped of the left side seen from beneatli, megalops-stage, 

 enlarged forty diameters ; a, protognath ; b, endognath ; c, exognath. 



Figure 5. — Second maxiUiped of the left side seen from behind, last zoea-stage, 

 enlarged forty diameters ; a, protognatli ; b, endognath, c, natatory exognath. 



Figure 6. — Second maxiUiped of the left side seen from beneath, megalops-stage, 

 enlarged forty diameters ; o, endognath ; b, exognath. 



Figure 7. — Third (external) maxiUiped of the left side seen from beneatli, megalops- 

 stage, enlarged twenty-four diameters 



Figure 8. — First maxilla of the right side seen from beneath, adult female Hippa. 

 enlarged twelve diameters ; «, inner lobe ; b, outer lobe ; c. palpus. 



Figure 9. — Remipes Pacificus. Mandible of the right side seen from beneath, adult 

 female, enlarged twenty -four diameters ; a, basal part of the mandible itself (proto- 

 gnath); 6. lateral spinous margin of the basal portion of the palpus; c, terminal 

 portion of the palpus. 



Figure 10. — First maxilla of the right side, from the same specimen as the last figure, 

 enlarged twelve diameters ; n, inner lobe ; 6, outer lobe : c, palpus. 



Plate XLVIII. 



Figure I. — Antennula, seen from the side, megalops-stage, enlarged twenty-four 

 diameters ; c, b, c, first, second, and third segments of the peduncle ; d, primary fla- 

 gellum ; e, rudimentary secondary flagellum. 



Fio^ure 2. — Same, from a specimen about 5"'"' in length, enlarged twenty -four diameters. 



Figure :'.. — Same, adult female, enlarged six diameters. 



Figure 4. — Abdomen, megalops-stage, dorsal view, enlarged twelve diameters ; a, first 

 segment. 



Figure 5. — One of the swimming legs of the second segment of the abdomen, megalops- 

 stage, enlarged twenty -four diameters; a, outer lamella, or exopod; b, inner lamella, 

 or endopod. 5a, portion of one of the plumose setaj, more enlarged. 



Figure 6. — One of the swimming legs of the fifth segment of the abdomen of the same 

 specimen, enlarged twenty-four diameters; a, outer lamella; b, inner lamella. 

 Ga, 6&, side and front view of one of the pecuhar appendages with which the tip of 

 the inner lamella is armed, enlarged .500 diameters. 



Figure 7. — Telson of adult male, dorsal view, enlarged two diameters. 



Figure 8. — Same, adult female, enlarged two diameters. 



Figure 9. — Rudimentary thoracic legs and third maxiliped of the left side, last zoea- 

 stage, enlarged twelve diameters; a, base of second maxilhpeds; b, third maxiUiped; 

 c d, e, /, g, thoracic legs ; h, branchife. The appendages are rei^resented as seen from 

 the inner (mesial) side and under slight compression so as to show the extremities 

 which are curled in and hidden from the outside ; in consequence, the branchiis are 

 represented diagramatically. 



Figure 10. — Appendage of the right side of the sixth segment of the abdomen, second 

 zoea-stage, dorsal view, enlarged forty diameters; a, basal portion; 6, outer lamella. 

 lOrt, tip of lamella with the bases of the terminal seta3, enlarged 175 diameters. 



Figure 11. — Corresponding appendage, third zoea-stage, enlarged forty diameters; a, 

 base; 6, outer lamella ; c, inner lamella. 



Figure 12. — Corresponding appendage, last zoea-stage, enlarged forty diameters. 



Fio-ure I.''-. — Posterior margin of telson, second zoea-stage, enlarged 100 diameters, 

 in this and the next two figures the arrow indicates the median line of the telson, 

 the margin on the left of it being exactly the reverse of that shown upon the right. 



Figure 14. — The same, from another individual in the same stage, showing a single 

 median spine in place of the two median spines and denticle in other specimens. 



Figure 15. — Posterior margin of telson, last zoea-stage, enlarged 100 diameters. 15a, 

 two of the denticles from the margin between the spines, enlarged 300 diameters. 



Fio-ure 16. — Ovigerous appendage of the second abdominal segment of an adult 

 female, enlarged four diameters. 



