140 



Part III. — Twenty-second Annual Report 



Fig. 56. Egg of Homarus vulgaris, showing three attachments, . x 10 



Fig. 57. Figg of Homarus vulgaris, showing three attachments. 

 Fig. 58. Tip of hair of endopodite of Homarus vulgaris. 

 Fig. 59. Dissection of first penis, magnified. 



Fig. 60. Longitudinal section of first penis, semi-diagrammatic, to show 

 the relationship of first and second penes and the genital 

 papilla, magnified. 



Fig. 61. Longitudinal section of second penis, to show muscles seen from 

 median line. 



Fig. 62. Tip of endopodite, posterior surface, magnified. The hairs ought 

 in proportion to be larger (viz., about one-third longer) 

 than they are here represented. 



Fig. 63. Plan of a row of hairs of endopodite, magnified. 



Fig. 64. Hair of endopodite of Nephrops norvegicus, . . x 48 



Fig. 65. First and second penes, lateral (external) view. 

 Fig. 66. Muscles of second penis. 



Fig. 67. Spermatheca of hard crab, 6f inches. December 1st, 1899. 

 Fig. 68. Second penis, lateral (external) view. 



Fig. 69. First penis, lateral (external) view, shows relationship of genital 

 papilla. 



Fig. 70. External (attached) egg of Garcinus mamas. December 21st, 1897. 



Plate IV. 



Figs. 94, 95, and 96 were outlined by means of the camera lucida. 



Figs. 71-81. Successive casts of a Cancer pagurus, Nos. 2-12 inclusive, 

 viz., A, Table VI. Natural size. 



Figs. 82-93. Successive casts of a Carcinus mamas, viz., No. 1 in 

 Table I. in "On the Larval and Early Young Stages, and 

 Rate of Growth, of Carcinus mcenas." Twenty -first Annual 

 Report of the Fishery Board for Scotland, Pt. III., p. 166. 



Fig. 94. Egg of Cancer pagurus taken from the vagina of a spawning 



female by means of a pipette, 30/11/00, . . x 57 



Fig. 95. Egg just extruded,. . . . . . x 57 



Fig. 96. Egg found on bottom of tank beside a spawning Cancer pagurus, x 57 



Plate V. 



The figures in this plate, with the exception of Fig. 100, were outlined by means 



of the camera lucida. 



Fig. 97. Edge of carapace of the cast represented in Fig. 75, . x 19 



Fig. 98. Half of carapace do. do. 74, . x 19 



Fig. 99. Frontal region do. do. 75, . x 19 



Fig. 100. Cast chela of a Cancer pagurus to show the absorption lines 



(abs.) on fthe coxopodite, basi-ischiopodite, and meropodite 



joints. Natural size. 

 Fig. 101. Half of carapace of the cast represented in Fig. 72, x 19 



Fig. 102. Do. do. do. 73, . . x 19 



Fig. 103. Enlarged drawing of cast shell represented in Fig. 71, carapace, x 19 

 Fig. 104. Joint on second penis, Cancer pagurus. 

 Fig. 105. Tip of second penis, do. 



N.B. — The " arrows" which accompany certain of the figures serve to indicate 

 the antero-posterior median line ; the point of the arrow is directed anteriorly. 



