the Glll-chamhers of Land-crabs. 381 



tnent xii. to the middle of xiii. in tliose specimens in which 

 it is most developed. 



The openings of the male ducts are situated near the 

 hinder end of segmeiit xii., on somewhat prominent 

 "cushions." Their lips, however, are by no means so large 

 and prominent as in E. carcinophilus. 



The apertures of the spermathecae lie, as usual, at the point 

 of junction of segments iv. and v. 



Internal Anatomy. 



Owiiio- to the poor state of preservation of the material 

 (with which, of course, no trouble had been taken, as tlie 

 ]n'esence of the worms in the crab's gill-chambers was pre- 

 sumably unknown) it was not found possible to obtain good 

 sections, and the account of the internal anatomy is necessarily 

 incomplete. 



Alimentary Canal. — The mouth, as already stated, is 

 situated ventrally. The buccal cavity leads, therefore, 

 almost perpendicularly at tirst. It is very narrow dorso- 

 ventrally {i. e. from front to back). The floor of it does not 

 appear to be furnished with a tongue-like organ such as that 

 seen in E. carcinophilus. The pharynx has a large muscular 

 pad in its roof, of a somewhat different shape from that of 

 the other species. This has not been observed in an everted 

 condition. No salivary glands have been seen. 



The septal glands are in three pairs, situated, as in the 

 other species, in segments iv., v., and vi. But the first and 

 spcond pairs form continuous masses passing completely over 

 the dorsal side of the oesophagus, which at this point is very 

 narrow. The third pair are smaller, and do not join dorsally 

 in this manner. 



It has not been found possible to give an account of the 

 blood-vascular or nephridial organs. 



The brain, is of a shape very similar to that of E. carcino- 

 philus, the posterior border being nearly a straight line, with 

 a just perceptible concavity. The nerve-cord presents no 

 feature worthy of notice. 



Genital Organs. — Tiie large sperm-sacs occupy segments x. 

 and xi., and have an extension anteriorly into segment ix. 

 The stiucture of the sperm-funnels has not been made oat, 

 but the ducts, as in the other species, are very long and 

 much coiled, and lead to the base of the muscular prominences 

 on whicli the external sperniiducal pores are situated. 



The ovaries are situated in segment xii,, on the septum 



