VIII 
ILLUSTRATIONS. 
Plate 
No. Page, 
position. (Fig. 66) Left first pereiopod of fourth Larva, from below. (Fig. 67) Left first pereiopod of 
fourth Larva, from below. (Fig. 68) Part of left third maxilliped of fourth Larva, from below, showing 
serrated inner margin of third segment. (Fig. 69) Left third maxilliped of first Larva, from above 252 
31. (Fig. 70) Left fourth pereiopod of first Larva, from above. (Fig. 71) Serrated spine from propodus of left second 
pereiopod of fourth Larva. (Fig. 72) Telson of embryo with eye pigment, July 26. (Fig. 73) Right second 
pereiopod of first Larva, from the side. (Fig. 74) Left second pereiopod of fourth Larva, from above. (Fig. 
75) Left fifth pereiopod of fourth Larva, from above. (Fig. 76) Left fourth pereiopod of fifth Larva, from 
above. (Fig. 77) Antenna} of Embryo 252 
32. (Fig. 78) Bud of first left abdominal appendage of fifth Larva. (Fig. 79) Seminal receptacle of Female. (Fig. 80) 
Left first abdominal appendage of Lobster. (Fig. 81) Ventral view of young Female Lobster. (Fig. 82) 
Left first abdominal appendage of the sixth stage of development. (Fig. 83) Left first abdominal append- 
age of Lobster in seventh stage. (Fig. 84) Left first abdominal appendage of Lobster in sixth stage. (Fig. 
85) Left first abdominal appendage of Female in eighth stage. (Fig. 86) Left first abdominal appendage of 
Female. (Fig. 87) Left first abdominal appendage of Male. (Fig. 88) Left first abdominal appendage of 
Female. (Fig. 89) Ventral view of Female Lobster in eighth stage. (Fig. 90) Left first abdominal append- 
age of young Male. (Fig. 91) Ventral view of young Male 252 
33. (Fig. 92) Left cheliped of fourth Larva in process of regeneration from stump. (Fig. 93) Left fourth pleopod of 
second Larva, from outer face. (Fig. 94) Left second pleopod of third Larva, from outer face. (Fig. 95) 
First abdominal segment of shell of Lobster in sixth stage, seen from behind. (Fig. 96) Left cheliped of 
molted shell of fifth Larva, seen from above. (Fig. 97) Left second pleopod of fourth Larva, from anterior 
face. (Fig. 98) Sterna of the last three thoracic somites of fifth Larva. (Fig. 99) Left fourth pereiopod of 
fourth Larva. (Fig. 100) Right second antenna of Lobster in seventh stage, seen from above 252 
34. (Fig. 101 ) Respiratory organs of second Larva, from left side. (Fig. 102) Telson of second Larva, from above. (Fig. 
103) Telson of first Larva, from above. (Fig. 104) Caudal fan of third Larva, from below. (Fig. 105) Caudal 
fan of fourth Larva, from above. (Fig. 106) Podobranchia of left second pereiopod of Lobster, probably in 
fourth stage, from inner side 252 
35. (Fig. 107) Left first antenna of the Embryo, frontal view. (Fig. 108) Right second antenna of same Embryo, from 
below. (Fig. 109) Rostrum of second Larva, from above. (Fig. 110) Profile view of carapace of first 
Larva. (Fig. Ill) Profile view of carapace of second Larva. (Fig. 112) Profile view of carapace of third 
Larva. (Fig. 113) Profile view of carapace of fourth Larva. (Fig. 114) Profile view of carapace of fifth 
Larva, showing tendon marks. (Fig. 115) Dorsal view of carapace of fourth Larva, from molted shell . . . 252 
36. (Fig. 116) Section of reproductive organ of Embryo near time of hatching. (Fig. 117) Section of right reproductive 
organ of first Larva. (Fig. 118) Right second antenna of an adult female Lobster, overgrown with algm. 
(Fig. 119) Oviduct and part of ovarian lobe from left side, showing a row of unextruded Eggs iu duct. 
(Fig. 120) Reproductive organs of adult Male Lobster from above. (Fig. 121) Disk-shaped concretion, 
probably containing glycogen, from maxilla. (Fig. 122) Large granular cell from first maxilliped. (Fig. 
123) Reproductive organs of adult Female dissected out, viewed from above 252 
37. (Fig. 124) Transverse section of proximal end of vas deferens of adult Lobster. (Fig. 125) Transverse section of 
vas deferens of adult Lobster. (Fig. 126) Transverse section of vas deferens of adult Lobster, showing 
thick muscular walls. (Fig. 127) Part of transverse section of vas deferens. (Fig. 128) Part of transverse 
section of vas deferens through glandular portion. (Fig. 129) Ripe sperm cells 252 
38. (Fig. 130) Seminal receptacle of adult Female, from above. (Fig. 131) Ovaries of immature Lobster, seen from 
above. (Fig. 132) Ovaries of immature Lobster, seen from above. (Fig. 133) Egg teased from fresh ovary 
shown in Fig. 138. (Fig. 134) Ova teased from fresh ovary shown in Fig. 136. (Fig. 135) Ova teased 
from fresh ovary shown in Fig. 137. (Fig. 136) Ovary immediately after egg laying, seen from below. 
(Fig. 137) Ovary of Lobster No. 87, Table 20, bearing external Eggs. (Fig. 138) Ovary of Female which has 
recently' hatched a brood 252 
39. (Fig. 139) Part of transverse section of ovary of Lobster, with external eggs in early segmentation. (Fig. 140) 
Part of transverse section of ovary of Lobster. (Fig. 141) Part of transverse section of nearly ripe ovary. 
(Fig. 142) Part of transverse section of ovary of Lobster, showing follicle cells which have wandered into 
the Egg and are undergoing degeneration. (Fig. 143) Part of transverse section of ovary, showing the 
gland-like organs 252 
40. (Fig. 144) Right pleopod of adult Female, seen from posterior surface. (Fig. 145) Fold of glandular epithelium 
from transverse section of ovary of Lobster. (Fig. 146) Transverse section of lobe of ovary. (Fig. 147) 
Part of transverse section of ovarian lobe from a Lobster with external eggs near the point of hatching. 
(Fig. 148) Part of transverse section of ovary. (Fig. 149) Part of transverse section of ovary 252 
41. (Fig. 150) Degenerating cells from the ovary of Lobster. (Fig. 151) Part of horizontal section of ovary from 
Lobster, showing ova inclosed in folds of follicular epithelium. (Fig. 152) Part of transverse section of 
ovary showing the developing ovum and its relation to the folds of glandular epithelium. (Fig. 153) 
G-landular epithelium from transverse section of ovary of Lobster 252 
42. (Fig. 154) Ovum in early stage of growth. (Fig. 155) Young ovum. (Fig. 156) Young ovum. (Fig. 157) Young 
ovum. (Fig. 158) Nucleus of ovum from transverse section of ovary of Lobster. (Fig. 159) Nucleus of 
ovum from nearly ripe ovary of Lobster. (Fig. 160) Nucleus of ovum from ovary' of Lobster. (Fig. 161) 
Nucleus of Egg in process of emitting polar cells. (Fig. 162) Bifurcated rostrum of Lobster taken at 
Woods Hole. (Fig. 163) Profile view of the same. (Fig. 164) Ovaries of Lobster, from below, showing 
bifurcation in left anterior lobe. (Fig. 165) Part of gastrolith, separated into its constituent spicules 252 
