the O til-chambers oj Land-crabs. 381 



mojit xil. to the middle of xiii. in those specimens in wliich 

 it i.H most dt'veloj)ed. 



The openinjrs of the mah; ducts are situated near tlie 

 hinder end of scpjinei.t xii., on somewhat prominent 

 "cushions." Their li|)s, however, are by no means so hirge 

 and prominent as in E. carciuophili/s. 



The apertures o£ the sprrmatheciu lie, as usual, at the point 

 of junction of segments iv. and v. 



Internal Anatomy. 



0\vi:i^ to the poor state of preservation of the material 

 (with wliicli, of course, no troul)le had been taken, as the 

 jiresence of the worms in the crab's gill-chunibors was pre- 

 sumably unknown) it was not found possible to obtain good 

 sections, and the account of the internal anatomy is necessarily 

 incomplete. 



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

 situated ventrally. The buccal cavity leads, therefore, 

 almost perpendicularly at first. 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. carcinophiliis. 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 tlie first and 

 st^cond jjairs 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 fuund possible to give an account of the 

 blood-vascular or nephridial organs. 



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

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

 a just perceptible concavity. The nerve-cord presents no 

 feature worthy of notice. 



(Jenital Orcjans. — The large sperm->ac3 occupy segments x. 

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

 The .-tiutture of the sperm-funncIs has not been made out, 

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

 much coiled, and had to the base ot the muscular prominences 

 on which the external spenniducal pores are situated. 



Tlie ovaries are situ.ited in segment xii., on tho septum 



