214 Miscellaneous . 



the Hydra forms the first step upward, in which the digestive cavity- 

 is a mere sac, which will work equally well inside-out, and the mode 

 of reproduction is extremely simple. From this group we pass to 

 the Actinia, in which there is a distinct stomach and a series of 

 fleshy lamellae around the internal cavity — the first rudiments of an 

 isolation of the functions of digestion and generation ; but the cir- 

 culating fluid is only the elaborated chyle mingled with more or less 

 water from without. A step further and we find separate organs for 

 the functions of the liver and a circulating system in some Echi- 

 noderms. Through the Bryozoa the Infusoria are connected with 

 the Tunicata and the other mollusks ; and through the Rotifera and 

 Entozoa they connect with the Articulata, thus passing by each way, 

 out of the true Radiate type, into that which characterizes the higher 

 subkingdoms. The Bryozoa, Rotifera and Entozoa may be ar- 

 ranged in the subkingdom Radiata, or with the Mollusca and Arti- 

 culata, whose types of structure they exhibit, though under a Radiate 

 form. 



The Echinoderms, although so strikingly peculiar in some species, 

 the Echini, yet, through the Holothuria, bear closely upon the Arti- 

 culata ; while the Acalephs incline toward the Mollusca. 



In the above remarks, it is not attempted to trace out all the gra- 

 dations in the groups referred to, but only the most prominent. The 

 animal kingdom is throughout a network of affiliations, yet there are 

 main trunks and larger branches, to which the smaller anastomosing 

 ramifications are subordinate. Much study will be required before 

 the system of nature from the Protozoa up can be correctly mapped 

 out. 



On two new species of Antelopes in the British Museum Collection. 

 ByJ.E. Gray, F.R.S. 



Senegal Gazelle. Gazella rufifrons. — Bay-brown (yellower in sum- 

 mer), with a paler upper and oblique lower black streak; front of 

 face yellow bay ; face- streak, back of feet, chest, belly and vent 

 white ; tail black ; edge of anal disc dark ; knees without any tuft, 

 with a ridge of rather longer hairs nearly to the foot. Larger than 

 G. Dorcas. 



Var. Nose black in front ; young paler. 



Hah. Senegal. Purchased in Paris. 



Easily known from G. Dorcas by the want of the knee-tuft. We 

 have two males, two females and a kid. The Corinne, F. Cuv. Mam. 

 Lithog. t. , not of BufFon. 



Isabella Gazelle. Gazella Isabella. — Fur short, very soft; pale 

 yellowish brown, with a broad, rather paler oblique streak on the 

 upper part of the sides ; knee-tufts, front of face and lower face- 

 streak darker yellow-brown ; upper face- streak, chest, belly, vent 

 and inside of the limb white ; tail black . Young paler, lower part 

 of sides rather darker. 



Hab. N. Africa : Egypt, J. Burton, Esq. ; Cordofan, M. Sundevall. 

 We have three males, one female and three young. 



