PLANAXIDJ). 185 



subvar. rugosolirata. 



3 North Australia ; ex c. British Museum. 



I cannot accept PI. undulatus, Lamarck, even as a variety, be- 

 cause some individuals in the same "hand-full" are of this, while 

 others are of the ordinary coloration. It is interesting to find 

 this species at Bombay, adjoining the habitat of the next form. 



2. Planaxis savignyi. 







Planaxis savignyi, Deshayes, Mag. Zool. 1844, pi. 109, Tted Sea and Mada- 

 gascar, long. 22, diam. 8 mil. ; fide Issel, PI. griseum, Srocchi, Cat. 

 Conch. G. Form, 1822, G. of Suez. 



50 Persian Gulf ; coll. W. T. Blanford, Esq. 



A trifle smoother and more ventricose than in the typical 

 figures ; the spots are often undulately confluent, as in the pre- 

 ceding species. Long. 21, diam. 16 mil. 



6 Suez ; ex c. Asiatic Soc. Bengal. 

 Agree exactly with Savigny's figure. 



20 Massaua and Annesley Bay ; coll. Prof. A. Issel, and W. T. Blanford, 

 Esq. 



A smaller and shorter- spired form closely resembling the 

 Arakan variety in shape. McAndrew records both PI. griseus 

 and PI. savignyi as distinct species, both as frequent at Suez ! 



var. subnigra. 



12 Hormuz and Muscat, Persian Gulf ; coll. W. T. Blanford, Esq. 

 20 Aden ; coll. G. Nevill, Esq. [mostly young]. 

 2 Kathiawar ; coll. P. Fedden, Esq. 



var. encaustica. 



Planaxis encausticus, Smith, Ann. Mag. IX, 1872, Arakan, long. 20, diam. 12 

 mil. 



10 Arakan [typical] j coll. W. Theobald, Esq. 



