REPORT ON THE CRUSTACEA MACRURA. 



105 



In Willemoes-Suhm's figure they are shown as existing anterior to the metastoma as if not 

 part of the same. A short oesophagus leads to a widely-distended stomach, which appears 

 to be little more than a simple sac of large proportions that opens into a second or pyloric 

 chamber (PI. XIX. pic), whose upper or dorsal surface is armed with four large serrate 

 plates, two of which, curved inwards, are attached to the surface, while a smooth calcareous 

 plate lies on the lower surface. The pylorus passes into a straight alimentary canal that ter- 

 minates at the anterior or broader part of the telson, as shown in the annexed illustration. 



Fig. 16. — " The chitiuous teetli in the stomach ; besides these 

 there is, at the spot where it joins the alimentary canal, 

 a thick chitinous skin strongly corrugated, that appears 

 almost as if it were hairy. In the alimentary canal I 

 found only mud." From Pentacheles euthrix. From a 

 drawing and notes by Willemoes-Suhm. 



Fig. 18. — " Mandible with palpus, magnified 

 about x4," from Pentacheles euthrix. 

 From a drawing by Willemoes-Suhm. 



Fig. 17.— " Posterior portion of stomach with 

 alimentary canal and telson," from Penta- 

 cheles euthrix, x2. From a drawing by 

 Willemoes-Suhm. 



The contents of the stomach, as well as that which I found in the mouth of another speci- 

 men taken at a distant locality, were such materials as are found in the Globigerina ooze. 

 That which I found in the stomach consisted of the remains of animals much crushed, 

 while that taken from the mouth consisted chiefly of unbroken Globigerina. 



The siagones or mandibles (PL XX. d.d) overlie the entrance to the mouth, and consist 

 of two large concavo-convex blades, boldly serrate at the impinging margins ; these 

 two psalisiform blades meet in the median line and overlap each other like scissors. The 



(ZOOL. CHALL. EXP. — PART LII. 1886.) Fff 14- 



