new Gastropoda from the Persian Gulf, cc. 323 
keeled periphery, bordered (as is the inner basal keel sur- 
rounding the umbilicus) with short mucronate crenulations, 
is most distinctive. The two species of Homalaxis found in 
the same dredging, and described earlier in this paper, are of 
a similar texture and bizarre sculpture, especially as regards 
the aforesaid carinal ornamentation. 
With regard to the Mollusca treated of in this paper, it will 
be well to state that four types are in the collection of 
Mr. HE. R. Sykes, viz. Rissoina registomoides, Eulima 
10-gyra, Fluxina Dalliana, and Clathurella Sykesii. All the 
rest, with co-types of the last two just mentioned, will be 
placed in the British Museum (Natural History). 
EXPLANATION OF THE PLATES. 
PLATE XX. 
Fig. 1. Emarginula undulata. 
fig. 2. Camilla. 
Fig. 3. Cyclostrema henjamense: 
Fig. 4. supremum. 
Fug. 5, —- annellarium. 
Fig. 6. prominulum. 
Fig. 7. euchilopteron. 
Fig. 8. Liotia romalea. 
Fig. 9. echinacantha. 
Fig. 10. Enida persica. 
Fg. 11. Euchelus Townsendianus. 
5 
Fig. 12. Solariella zacalles. 
Fig. 13. Calliostoma thrineoma. 
Fig. 14. Leptothyra rubens. 
Fig. 15. Trichotropis pulcherrima. 
Fig. 16. Solariwm (Torinia) cerdaleum. 
PuatEe XXI. 
. Solariun abyssorum. 
. Fluxina Dalliana. 
Homalaxis rotula-catharinea. 
cornu-Ammonis. 
Cerithium verecundum. 
. Scaissurella etheria. 
. Fossarus (Couthouyia) unicarinalis. 
. Adeorbis axiotimus. 
. Erato recondita. 
, var. haplochila, 
. Lulima decagyra. 
. Rissoina isosceles. 
(Zebina) registomoides. 
. LHulimella carmanica. 
. Pleurotoma (Gemmula) navarchus. 
PLATE XXII. 
Fig. 1. Syrnola mussandamica, 
Tig. 2, Mormula persarum. 
WY) 
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Fig. 
Fig. 
Fig. 
Fug. 
Fug. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fug. 
Fig. 
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