284 Transactions of the Society. 



is somewhat elliptic, the proportion of width to length being about 

 1: 1-4 (plate VIII. fig. 1). 



2. The number of teeth on either side of the posterior eniar- 

 gination of the shell is in the Sicilian specimen 14 to 15, and in 

 mine varies from 17 to 22. Brauer gives the number as about 17. 



3. In the Sicilian specimen the proportion of width to length 

 of the tail-plate (plate VIII. fig. 2) is 1:1" 87, and is given by 

 Brauer as 1:2. In my specimens this plate is considerably 

 longer, varying from 1 : 2 " 2 to 1 : 2 ■ 8, with an average of 1 : 2 • 4. 

 The tip of the plate is einarginate in the Sicilian specimen, and in 

 my own may be evenly rounded, truncate, or emarginate. The 

 number of dorsal median teeth is generally about 7, but may be 

 as many as 11 in addition to many minute denticles. In the 

 Sicilian specimen there are 6. 



The form of the tail-plate in young individuals resembles very 

 closely that of the adult L. glacialis, as has been pointed out by 

 Brehm with reference to L. prodnchts. 



L. lubbocki has been found at Bone in Algeria (Simon). 



Artcmia salina Linn. — Artemia salina seems to occur in all 

 the chotts, or salt lakes, of Algeria and Tunisia, but I was some- 

 what surprised to find that it did not occur in any waters in the im- 

 mediate neighbourhood of Biskra, whatever their salinity might be. 

 I myself found it only in Chott Tinecilt (Haut Plateau, 2800 ft.), 

 and in Chott El Ariana, near Tunis. Eight adult specimens were 

 collected in a pool by the shore of the latter, of which two were 

 males. The furcal rami of the six females show an extraordinary 

 variety in the number and arrangement of the seta?, the number 

 being generally different in the two rami. The number of setae 

 on each ramus (including minute teeth) ranges from three to eleven. 



Branchinecta sp. — In the salt pools at the edge of Lake 

 Sedjouma, a species of Branchipod was found which I am unfor- 

 tunately unable to identify. Several larva? were taken, and one 

 nearly adult female, besides a single male just beginning to show 

 its sexual characters. The following is a description of these two 

 specimens: — 



Female : Head and thorax considerably shorter than the 

 abdomen, which consists of nine segments. Segments of the 

 abdomen longer than broad. Furca longer than the last segment 



EXPLANATION OF PLATE X. 



Fig. 11. — Daphni chcvreuxi Rich. Head of young male, from dorsal side, x 260. 

 ,, 12. — Strcptocepludus bimaris sp. n. Male, x 8. 

 ,, 13. — Moina salinarum sp. n. Female, x 65. 

 ,, 14. — Ditto. First antenna of female, x 260. 

 „ 15. — Ditto. Part of the post-abdomen, x 440. 

 ,. 16. — Macrothrix hirsuticomis Norm. & Br. Male, x 120. 



