Mr. E. A. Smith on the Genus Pythina. 227 



only species which it resembles in this respect being, I 

 believe, G. imsillus of Meinert, from North Africa. It is 

 undoubtedly very closely allied to the above-described G. 

 antijiodum, but differs in having a smaller number of legs, 

 in being broader in the head, &c. 



EXPLANATION OF PLATE XIL 



Fig. 1. Henia athenarum, sp. n. Head from below. 



Fig. 2. Geophilus Grantii, sp. n. Anal somite from below. 



Fig. 3. Geophihis challengeri, sp. n. Head from above. 



Fig. 3 a. Ditto. Head from below. 



Fig. 4. Geophilus parthorum, sp. n. Head from above. 



Fig. 4 a. Ditto. Aual somite from below. 



Fig. 5. Geophilus siydnegensis, sp. n. Head from above. 



Fig. 5 a. Ditto. Head from below. 



Fig. 5 b. Ditto. Anal somite from below. 



Fig. 6. Geophilus laticeps, sp. n. Head from above. 



Fig. 6 a. Ditto. Head from below. 



Fig. 7. Geophilus morbostis (Hntton). Head from above. 



Fig. 7 a. Ditto. Anal somite from below. 



Fig. 8. Geophilus antipodum, sp. n. Aual somite from below. 



Fig. 9. Geophilus Huttoni, sp. n Head from above. 



Fig. 9 a. Ditto. Head from below. 



Fig. 9b. Ditto. Anal somite from above. 



Fig, 10. Geophilus promcator, sp. n. Head from above. 



Fig. 10 a. Ditto, Head from below. 



Fig. 10 b. Ditto. Anal somite from below. 



Fig. 11. Geophilus alacer, sp. u. Head from below. 



Fig. 11 a. Ditto. Anal somite from below. 



Fig. 12. Cryptops atlantis, Pocock. Anal leg from the side. 



XXVI. — Remarks upon the Genus Pythina of Hinds and the 

 Species which have been referred to it, upon Mysella of 

 Angas, and the Description of a neto Species of Mylitta. 

 By Edgar A. Smith. 



[Plate XHI. A.] 



(a) On Pythina, 



The genus Pythina was established by Hinds in 1844 for a 

 small triangular bivalved mollusk collected at Nev7 Ireland 

 during the voyage of the ' Sulphur,' which is distinguished by 

 a very peculiar kind of surface-ornamentation or sculpture, 

 namely ribs or folds which extend from each end of the valves 

 in an upward direction, meeting and divaricating at the 



15* 



