82 EDGAE J. ALLEN. 



he regards as salivary glands, occur in the oesophagus, in the 

 labrum, and in the first and second maxillte of various Deca- 

 pods, and that the glands situated on the epimera of each seg- 

 ment of the abdomen, which secrete the fluid used to attach 

 the ova to the appendages, have a like structure. 



The glands in the labrum and maxillae of Palsemonetes 

 differ but little in appearance from the reticulate glands of 

 the gill. The network in the protoplasm is well developed, 

 but stains less deeply than that in the gill, the nuclei are 

 smaller and lie quite close to the bases of the cells, and the 

 characteristic appearance of the centre of the gland is not 

 quite the same. 



Nebeski^ has described glands found in the legs of certain 

 Araphipoda (Corophiidae and Orchestia), and P. Mayer" and 

 Claus^ others found in Phronimidse, which seem to throw 

 light upon the spherical glands of the Decapods. In the 

 Corophiidae and Orchestia the glands are described as unicel- 

 lular, and containing a number of fine chitinous canals, which 

 unite together to form a duct which opens on the exterior. 

 In the Phronimidae each gland consists of either three or five 

 cells. In the case of those with three cells, two of these are 

 large, whilst the third is smaller, and gives rise to the duct 

 which communicates with the exterior. When the gland 

 consists of five cells, four are large, and surround a smaller 

 one, which is the duct cell. All the large cells contain a 

 number of fine chitinous canals, which communicate directly 

 with the duct. 



If the network seen in sections of the reticulate glands of 

 the gill of Palaemonetes is due to the presence of fine chan- 

 nels which communicate with the duct, the difference between 

 * Nebeski, " Beitrage zur Kenntniss der Amphipoden der Adria," ' Arbeiten 

 a. d. Zool. Inst. Wien,' Bd. iii, 1881. 



^ P. Mayer, " Carcinolog. Mittheilungen," ' Mitth. a. d. Zool. Station in 

 Neapei; I, i, 1878. 



3 Claus, "Zur Naturgeschiclite d. Phrouima sedentaria," ' Zeitschr. 

 f. w. Zool.,' 1872. "Der Organismus der Phronimiden," 'Arb. a. d. Zool. 

 Inst. Wien,' Bd. ii, 1879. 



