28 



The hindermost cavity (PL IV. fig. 6, q) is a longitudinal tube, commencing by a 

 blind end above the rectum; it extends forward, expands, and bifurcates about the 

 middle of the thoracetron ; the branches at first diverge, then bend inward and I'eunite, 

 sending back into the interspace of the bifurcation a short blind sac. From the base of 

 this heart-shaped portion the bifurcate tubes are continued forward, slightly diverging, 

 leaving a mid space for the heart and intestine as they cross the articulation between 

 the thoracetron and the cephaletron. About two inches in advance of the second 

 bifurcation each tube expands laterally into a triangular cavity, from the outer and fore 

 angles of which the ramified systems of the lateral loops, q", are continued. A small 

 branch is sent oif from the outer side of the dilatation. Three or four tubes converge 

 from its fore part, and anastomose f to form the anterior single symmetrical cavity, q*. 

 This is oblong, subquadrate, subdepressed, and subreticulate. It is longitudinally chan- 

 nelled above, by the fore part of the heart resting therevipon, this part of the ovary 

 being interposed between the heart and intestine (PI. IV. figs. 1 and 2, q). It seems to 

 have been developed in or from the last remnant of the included germ-mass. Prom the 

 hinder and outer angles of the antero-median part of the ovary proceeds the tube, which 

 passes outward and backward, joins that from the fore part of the lateral expansion, and 

 curves outward and forward to meet and inosculate with a similar retrograde branch from 

 the fore and outer angle of the antero-median lobe. From the outer side of these ovarian 

 loops (PL I. fig. 2, q**, and PL IV. fig. 6, q") proceed four or five branches which inter- 

 ramify with the hepatic lobes. The branch tubes (5*) continue from the fore part of the 

 antero-median sac ; and its loops are continued, subdividing and reticularly anastomos- 

 ing, along the sides of the gizzard to the fore part of the cephaletron. 



Each of the main parial oviducal canals, before converging to the anterior reunion, 

 dilates and sends outward and backward a wide tube, which after sending off, or rather 

 receiving, three large tubes (g**) is continued backward as the common oviduct (PL I. 

 fig. 2, ; PL IV.fig. 6, 0). The hindmost of the three large tubes passes outward and 

 backward to near the outer ends of the joint between the cephaletron and thoracetron, 

 and there curves forward beneath the lateral cephaletral ridge, and receives the ova from 

 the parts of the ovary extending to the lateral margins of the cephaletral cavity. The 

 foremost. of the three branches collects the ova from the deeper-seated interapodemal 

 parts of the ovarium, the intermediate branch those from the dorsal level above and ex- 

 terior to the apodemata. 



The numerical correspondence of the lateral tributaries to the main median or sub- 

 median recej)tacles of the ova with the neural indications of the segmental constitution 

 of the two chief divisions of the body, is less obvious than in those of the hepatic masses. 

 This may be due to the later period of development of the genital factories. 



The part of the ramified ovarian system to which the term oviduct is here applied is 

 the tube, 0, continued from the common stem of the three last-described tubes, and 



t ' Lectures on Invertebrata,' ed. 1855, p. 329 : shown, in Main, in fig. 135, a', V. Anastomoses between the 

 right and left system of ovarian-tubes were also noticed by Gcgcnbaur (toe. clt. p. 247), who well remarks on this 

 evidence of crustaceous affinity : — " Durch dicse Verbindung beider Ovarialhiilften reiht sich Lhnidus an viele andere 

 Krustenthiere an, wo gleichfala ein unpaarer Abschuitt der inneren Genitalorgane vorhanden ist." 



