from the, Persian (iulj\ (Cr. 1') 



impreasis, apud medium fortitor acute aiipul.itiH, uiuli(jue costulis 

 obliiiuis decora tis, spiraliter fori iter rudilirntis, ultimo ani'raclu 

 etiam apud periplicriara fortitor anfjulato, et deiudo ad basiu 

 liiia spiralibus, uumero iiovem, praidito ; apcrtura ovata, labro 

 extus ad medium angulato, columella fere recta. 

 Long. 3, lat. 1-50 mm. 



Hah. Gulf of Oman, lat. U° 56' N., long. 5G'' 5i' E., 

 150 fathoms. 



Allied to other PleurotomeWe from tlio same locality — e. g. 

 P. vereidxim^ aviphitrites, euUmenes, &c. ; but differing fioin 

 all in its compact abbreviated-fusiform contour, wrinkled 

 sculpture, and coarse median angulation. 'J'lie spiral liite, 

 too, are coarse and pronounced, proportionately speaking. 



Donovania tomlini, sp. n. (PI. If. fig. 26.) 



D. testa crassa, breviter et obtuse fusiformi, solidula, ocliracco- 

 brunnea vel tore nigra ; anfractibus 6-7, apice ipso perobtuso, 

 crasso, interdum (piasi-immerso, caeteris loiigitudiualiter crassi- 

 costatis, iuterstitiis iiitercostalil)US laevissimis, apud suturas ira- 

 pressis, paullum veutricosis, ultimi costis ant'ractus numero ad 18, 

 ad basin spiraliter crassiliratis ; apertura anguste ovata, labro 

 effuse, columella fere recta, canali brevissimo. 



Long. 3, lat. 1 mm. 



Hub. Persian Gulf, Ilenjam Lsiand. 



A good many specimens, collected together in 1906, sliowlng 

 the species to be gregarious, if local. Superficially it 

 resembles Cer. tubercular is ^ Mont., or a Bittium, the colour 

 varying from ochre-brown to almost black. Thick in sub- 

 stance, the aj)ical whoils sometimes appearing almost 

 immersed, causing the small longitudinal ribs of tiie third 

 whorl to stand out, just as if placed at tiie summit of the shell, 

 while in other examples the apex shows more distinctly and 

 normally. The aperture is narrowly oval, outer lip effuse, 

 columella almost straight, canal very short. With it occurred 

 Pt/rguUna calUnta^ Melv., and a small Triphora. 



This is the second Donovania recorded from these seas. 

 The first was described under the name of Lachesis bicolor, 

 Melv.* It gives me much pleasure to name it specifically 

 alter Mr. J. R. le Brockton Tonilin, who is devoting much 

 time to the study of the smaller Mollusca. 



Turris invicta^ sp. n. (PI. IL fig. 27.) 



T. testa breviter conico-fusiformi, turrita ; anfractibus ad 14, 

 * Mem. Manch. Soc. vol. xlii. part 2, no. 4 (1808). p. M, pi. i. li^^ 17. 



