The Structure and Functions of the hpemolyniph Glands and Spleen. 15 



present in any numbers in tlie sinuses. Tliei'e is nevertheless some- 

 thing' in the general arrangement of lymphoid tissue and sinus in these 

 organs, which is not found in the typical glands of the ox and sheep. 

 Vincent and Harrison classed them with the compound glands in the 

 dog. The general arrangement of the tissues is certainly similar, but 

 they are by no means of th« same variety. 



In the mouse. • Several individuals of the species of common house 

 mouse {Mus domesticus) have been dissected. In these the arrangement 

 is so similar to that, which obtains in the rat, as to need no special 

 description. The glands are less numerous and are less vascular than 

 in the latter. 



In the rahhit. {Lepus cuniculus.) Hnemolymph glands are onW oc- 

 casionallj^ met with in this animal. When they do occur they 

 are pinkish or brown in colour, and are small and inconspicuous, 

 resembling both in colour and size those of the "splenic group" in 

 the rat. They occur most frequently in the subvertebral region, and 

 in those situations where lymphatic glands are usually found. 



In the guinea pig, (Cavia cohaya), splenic and renal groups are 

 found fairly constantly. The glands forming these groups are of irre- 

 gular form, and to naked eye inspection resemble those of the dog. 

 I have however been unable to trace lymphatic vessels to them and am 

 doubtful as to whether they may be classed with the splenic group of 

 glands in the rat, or the hœmal lymphatic glands of the dog, though I 

 am more inclined to consider them of the same variety as the former. 



In the squirrel (Sciiirius vulgaris), the arrangement is very similar 

 to that in the rat. The same may be said of the ivater vole (Arvi- 

 cola amjjhihius) and short tailed field mouse (Arvicola agrestis). 



5. Insectivora. 



At present the only individual examined has been the mole {Talpa 

 europœa)}) The glands were found in the renal and splenic regions, 

 and from naked eye appearances seemed to be of the hœmal type. 



'j The glands have since been found in the Hedgehog (Ei'inaceus Europœus). 

 They were seen in the renal and splenic positions. In neither have they been 

 microscopically examined. 



