NOTODELPHYS. 237 



of lower joint arising in pairs. The third pair of foot- 

 jaws (f. I/) is composed of seven articulations, the 

 basal being the largest, the others diminishing in size as 

 they succeed, and all armed with a number of long seta? 

 on the inner edge. 



The legs are five pairs, all formed alike. They con- 

 sist (f. 1 ff) of a common footstalk, of two joints, and 

 two branches, each of which is divided into three articu- 

 lations. The external branch is much the larger of the 

 two, and has the last articulation the longest, and armed 

 with several rather long setae. The internal branch is 

 about as long as the first two segments of the external 

 portion, and the articulations are short and setiferous. 

 The fifth pair is formed like the others. 



The abdominal portion of the body is small and slender, 

 the animal generally carrying it curved upwards. The 

 last segment is bilobed, and each lobe gives off five 

 tolerably strong setae or spines. The alimentary canal 

 consists of a simple straight tube. 



Hob. Frith of Forth, H.Goodsir, W. Thompson, Esqrs. 



. 



Genus NOTODELPHYS.* 



The genus Notodelphys of Allman must form the type 

 of a new family. Till we are better acquainted with it, we 

 must place it here provisionally, as it has many things in 

 common with both the Cyclopidse and Cetouhilidse, though 

 it differs materially from both. 



Character. One eye. Head and first ring of thorax 

 consolidated together. Thoracic portion of body consists 

 of four, and abdominal also of four segments. Superior 

 antennas many-jointed; inferior prehensile. Foot-jaws, 

 four pairs. Ovary consists of a large sac, placed behind the 

 last thoracic ring, and within the parietes of the body. 



* From j'wrof. tcrfmm, back ; and diXtivt;. matrix or womb. 





