M. J. Frenzel on the Mesozoon Salinella. 79 
Tail longer than the head and body, brown above, pen- 
cilled with black terminally, orange-rufous on the sides and 
below. Palms and soles with the essential characters of 
those of G. gracilis, leucogaster, &c., ¢. e. naked, with five 
anterior and four posterior pads, but distinguished from all 
the species of this group by the fact that a band (about 4 
millim. broad) of fine hairs passes across the soles at about 
the level of the base of the hallux. Skin of soles black. 
Skull very much as in G. gracilis. Bulle small, egg- 
shaped, their posterior part scarcely swollen. 
Teeth: upper incisors much bevelled, each with one deep 
groove. Molars with the low, distinct, directly transverse 
lamine characteristic of this group of Gerbilles. 
__ Dimensions of the type (an adult specimen in skin) :— 
Head and body 140 millim.; tail 155; hind foot 29. 
Skull: basal length 30; greatest length 35; tympanic 
breadth 16°5; nasals, length 14, breadth 3:7; interorbital 
breadth 6 ; interparietal, length 4, breadth 8°5 ; palate, length 
18°5, diastema LO, palatal foramen 6:1; length of upper molar 
series 5°2; greatest diameter of bullee 10°4 ; vertical height of 
brain-case and bullae combined 13°5. 
Hab. Wadelai. 
Type (87. 12. 1. 50) collected and presented by Dr. Emin 
Pasha. 
A second specimen, collected at the same time and place, 
agrees in every respect with the type. 
These two specimens were presented to the Museum with 
Emin Pasha’s first collection (see P. Z. 8. 1888, p. 10, 
no. 24). Turning out now to be new, it is only just that 
they should receive the name of their distinguished discoverer. 
XIL.— The Mesozoon Salinella. 
By JOHANNES FRENZEL *. 
Ir is a well-known fact that between unicellular and multi- 
cellular animals there hitherto stretched a gulf which was 
wider than that between the vegetable and animal kingdoms, 
for indeed the two latter, in spite of the advances which we 
have made in knowledge, are even to-day hardly separable 
from one another. The unicellular animals, usually com- 
prised under the name Protozoa, and embracing besides many 
doubtful forms of the Protista, not only consist, as their name 
* Translated from the ‘ Biologisches Centralblatt,’ xi. Bd. no. 19 
(October 15, 1891), pp. 577-681. 
