XII LIST OF ILLUSTRATIONS. 



PLATES. Facing 



page. 



46. Male of Clavella tumida, female and male of C. canaliculata, and female of C. 



insolita 730 



47. Female of Clavella levis, and female and male of C. pinguis 730 



48. Female of Clavella squamigera, and female and male of C. uncinata 730 



49. Female of Clavella uncinata, female and male of C. irina, and female of 



Clavellopsis robusta 730 



50. Females of Clavella recta and Clavellopsis producta, and female and male of 



Clavellisa spinosa 730 



51. Female and male of Clavellodes rugosa 730 



52. Female of Clavellisa spinosa and female and male of C. cordata 730 



53. Female and male of Brachiella Ihynni and B. gulosa 730 



54. Females of Brachiella gulosa and B. mitrata, and female and male of B. 



elegans 730 



55. Females of Brachiella elegans and B. mitrata, and female and male of B. 



pinguis 



56. Females of Brachiella pinguis, B. nitida, and Parabrachiella rostrata 730 



TEXT FIGUHES. 



Page- 

 Trizocardnus dentatus, ventral \dew of left side of carapace of male type, shoAving 



stridulating ridge 117 



Chasniophora macro phthalma, anterior view of orbit of type female, sho\ving 



hiatiis, in which lies the antennal flagellum 119 



Platychirograpsus iypicus. a. Outer side of large chela of male in Halifax 

 Museum, nat. size. b. Upper view of same, nat. size. c. Outer side of 



large chela of small male from Mexico 122 



Sesarma (Holometopus) tampicense, ventral view of left appendage of first 



abdominal segment of male 125 



Uca musica. a. Lower ^iew of large (left) chela of male type, showing stridu- 

 lating ridge, b. Anterior (lower) view of portion of first left ambulatory 

 leg of male type, showing granules which play against stridulating ridge.. 127 



Distribution of the genus Onychomys 431 



Distribution of the subspecies of Onychoviys leucogaster 435 



Distribution of the subspecies of Onychomys torridus 455 



Section of Clavella 'uncinata showing a, anus; go, genital opening; gp, genital 



process; sr, sperm receptacle; st, sperm tube; i, intestine 573 



Cross section of proboscis; 7ipl, upper lip ; vnl, lower lip 578 



Mouth parts of Lernaeopoda galei. md, mandible; mx, first maxilla; rm, re- 

 tractor muscle of mandible; upl, upper lip; vnl, under lip 579 



Dorsal muscles of Achthercs ambloplitis 582 



Ventral muscles of Achthercs ambloplitis 583 



Circulatory muscles of Achtheres ambloplitis. a, anterior; m, median; p, pos- 

 terior 584 



The male of Clavellisa cordata. an^ and an'''', antennal muscles; md, mandible 



muscle; vix^ and mx^'', maxillary muscles; mxp, muscles of the maxilliped.. 585 

 Dorsal view of ejaculatory muscles (em) and sperm receptacle (sr) of Achtheres 



ambloplitis 586 



Cement glands of Achtheres ambloplitis. b, basal portions; c, central; t, ter- 

 minal 590 



Egg filament and developing egg in Clavella uncinata 591 



Egg filament and developing egg of Clavellisa cordata 592 



Egg filament and egg of Naobranchia lizae 592 



Copepodid lan^a of Clavella uncinata 593 



Copepodid lar^'a of Clavella uncinata. a, mandible; b, first maxilla; c, second 



maxilla; d, maxilliped 594 



First (upper) and second swimming legs of copepodid larva of Clavella uncinata. 595 



