XII LIST OF ILLUSTRATIONS. 



Facing page. 



42. Fig. 1. — < rrapsus grapsus. Fig. 2. — Ucides occidmtalis 020 



43. Fig. I. -Uca insignis. Fig. 2.—Ocypod( gaudichaudii. Fig. 3. — Ostraco- 



thert s politus 620 



44. ( 'ardisoma crassum 620 



45. Fig. 1. — Leucosilia jurinei. Fig. 2. — Leptograpsus variegatus. Fig. 3. — 



< 'allianassa uncinate. Fig. 4.— Microphrys aculeatm 620 



46. Fig. 1.— -Pinni id transversalis. Fig. 2. — T<l<oplui/s crist ulipes. Fig. 3. — 



Paehygrapsus transversus. Fig. 4. — Acanthonyx petiverii. Fig. 5. — 

 Pachych It s grossiman us. Fig. 6. — C/ca galapagensis 620 



47. Fig. 1. — Eurytium tristani. Fig. 2. — Hypoconcha peruviana. Fig. 3. — 



Goniopsis pulchra. Fig. 4. — Clibanarius panamcnsis 620 



48. Fig. I. Pagurus benedicti. Fig. 2. — Speocarcinus ostrtancola. Fig. 3. — 



C/ica princeps. Fig. 4. — Dromidia sarrdburei. Fig. 5. — Petrolisthes spini- 

 frons. . Fig. (i. — Dissodactylus nitidus 620 



49. Fig. 1. — Eim liin (iimloga. Fig. 2. — Dardanus sinistripes. Fig. 3. — Dardanus 



imbricatus. Fig. 4.— Portunus {Portunus) acuminatus. Fig. 5. — /."»/- 

 pleurodon trifurcatus. Fig. 6. — Enu rila emerita 620 



50. Fig. I. Paguristes tomentosus. Fig. 2. — Pilumnoides perlatus. Fig. 3. — 



Microphrys platysoma. Fig. 4. — Aratus pisoni. Fig. 5. — Wepatella 

 arnica 620 



51. Fig. 1. Macrobrachium jamaicense. Fig. 2. — Paguristes hirtus. Fig. 3. — 



Pinnothereha la i igrata 620 



52. FiL r . I. Panulirus ornatus. Fig. 2. — Rhynchodnetes typus. Fig. 3... 



/'.s-i udosquilla lessonii : 620 



.V,. Fig. I. Palxmonritteri. Fig. 2. — Peneus styhrostris. Fig. 3. — Lysiosquilla 

 decemspinosa. Fig. 4. — Synalpheus tovmsendi peruvianus. Fig. 5. — 

 Munida coh ri 620 



54. Fig. I. Bithynis csementanus gaudichaudii. Fig. 2. — Peneus brevirostris. 



Fig. 3. ( 7//o/vVA Wa du&ia 620 



55. ( 'allinectes toxotes 620 



56. Call! mil is urn i at us 620 



TEXT FIGURES. 



Page. 



Photomicrograph of a thin slice of sand-barite, cul at righl angles to a penetra- 

 tion twin of two tabular individuals crossing al an angle of 30 degrees. Polar- 

 ized light; magnification aboul 25 diameters. Rounded and Blightly angular 

 quartz grains are abundantly interspersed in a ground of regularly oriented 

 barite. The indh idual to the right is nearly extinguished, while the one to 

 the left is brightly illuminated. The basal cleavage may be Been in each... 23 

 Subspecies of Lagopus lagopus. a, Lagopus lagopus albus (from a specimen 

 from Ungava). b, Lagopus lagopus alexandra (from a specimen from the 



Shumagin islands), c, Lagopus lagopus (from a specimen from Norwaj i 53 



Triglopsis ontarit nsis Jordan and Thompson 76 



Ti iglopsis slim /ism, i Hoy 77 



( 'ottus i ii' i i Nelson i 78 



Meinertia gaudichaudii. a, adult female, b, adult female, c, lateral view of 



tlxnax 80 



Meinertia gaudichaudii. u. young of fir.-t stage, b, Becond l'"_ r of adult male. 



C, lateral view of thorax of adult male, d, adidt male 80 



Spha idiiiu i>i r a i in n a in 81 



Sphseroma peruvianmn. a, mandible, b, firsl maxilla, c, maxilliped. d, 



firstleg. e,secondleg /", third leg. 0,fourthleg ft.fifthleg. i,sixthleg. 82 

 Orbimorpkus constrictus. a, adult female. //. firsl lamella of marsupium. c, 



seventh leg of female, d, male 84 



