MELTILL : ON GASTEOrODA FKOil THE PERSIAN GULF, ETC. 53 



ScALA (Achilla?) cophtnodes,^ n.sp. PI. V, Fig. 17. 



S. testa attenuato-fusiformi, gracili, delicata, alba, parum nitida, an- 

 fractibus (probabiliter) 15-16, quorum apicales tres, perlaeves, diaphani, 

 caeteris — certe anfr. 9-10 — multum apud suturas impressis, tumidulis, 

 arctissime undique longitudinaliter obliquiliratis, liris acutis, laevibus, 

 interstitiis sub lente spiraliter pulchre striatulis, apertura rotunda, 

 peristomate paullum expanso, hand cootinuo, marginem apud 

 columellarem incrassato, laevi, albo, nitido. Long. 10, lat. 2'5mm. 



Ifab.— Persian Gulf, Gulf of Oman, lat. 24° 58' N., long. 56° 54' E., 

 156 fathoms. 



When preparing an account of the Scalm of the Persian Gulf, 

 Mr. K.. Standen and I were compelled to omit this very distinct 

 species, owing to our only possessing two fragments. Since then, 

 Mr. J. W. Jackson has found in the shell- sand an apical tip, and 

 a small but quite perfect juvenile example, possessing nine whorls in 

 all. With the aid of these I am able, to some extent, to diagnose it, 

 but it is not possible to say what size a full-gi'own specimen would 

 attain to. It is most likely an Acnlla, allied to S. acuminata, Sowb., 

 which occurs in the same region. The acute longitudinal riblets are 

 nearly 50 on the largest whorl examined, this being probably the 

 antepenultimate. It differs from other Acrillce, however, in the close 

 spiral striolation, the surface not becoming decussate, as the riblets 

 themselves remain smooth. 



AcLis BELTisTA,^ n.sp. PL Y, Fig. 18. 



A. testa obtecte umbilicata, gracillima, attenuata, alba, anfi-actibus 

 13-14, quorum apicales tres parvi, perlaeves, vitrei, caeteris apud 

 suturas multum impressis, ventricosis, undique spiraliter arete 

 carinulatis, carinulis anfractuum superiorum duabus, antepenultimi 

 et penultimi tribus, ultimi anfractus quatuor, superficie ipsa laevi, 

 nitida, apertura fere rotunda, labro ad basin paullum expanso, fere 

 continuo. Long. 6, lat. l'5mm. 



^rtJ.— Persian Gulf, Gulf of Oman, lat. 24° 58' N., long. 56° 54' E., 

 156 fathoms. 



A very graceful species, conspicuously keeled, its nearest ally in its 

 fauna being A. calotroph? M. & S., a much smaller species, with only 

 one carina in the centre of each whorl. A few examples only. 



RissoA (ScROBs) coLUMEN,* n.sp. PL V, Fig. 21. 



R. testa cylindrica, albo-lactea, delicata, nequaquara nitente, 

 anfractibus 6, quorum apicales duo, apice ipso planato, fere immerso, 

 caeteris ad suturas impressis, gradatulis, ultimo fere recto, cylindrico, 

 apertura ovata, peristomate continuo, incrassato, albo, expanso, 

 columella obliqua. Long. 4, lat. l'3mm. (sp. maj.) ; long. 3, 

 lat. 1 mm. (sp. min.). 



^ Ko<^ivui^i\%, basket-like. 



* /SeXTttTTos, the best. 



3 Proc. Zool. Soc, June, 1901, p. 357. 



* Columen, a columu. 



