Erythrean Molluscan Fauna. 551 
yet published*, with a very few Gastropoda—the genera 
Fusus and Nassa mainly. ‘This work leaves little or nothing 
to be desired for accurate elaboration of detail. 
Dr. F. Jousseaume, so well known for the close attention 
he has given to the Erythrean and Adenese Mollusca for a 
long period, in 1898 published an account of the Triforidee T of 
the Red Sea, with descriptions of many new species and like- 
wise various new genera which we have not seen, e. g. Olt- 
toma ottitoma, Issina issina }, and others. 
Two new Scalarie have been likewise lately described by 
Clessin§ from this region. Bavay has written on the 
Mollusea of the Suez Canal || and Dall on those of the Gulf 
of Aden obtained by the Field Columbian Museum Hast 
African Expedition {]. 
Dr. E. von Martens, finally, in 1899 ** described three 
new Erythrean oysters (Ostrea pectinata, dolabriformis, and 
oniscus), collected long ago (1820-25) by Hemprich and 
Ihrenberg. 
It is much to be hoped that Commander Shopland will, ere 
long, be able to issue a second edition of his invaluable cata- 
logue, which will then furnish a most complete and up-to-date 
record of what was known at the commencement of the 
twentieth century of the Adenese Molluscan fauna. I would 
just add that it is my hope to be in a position before very 
long to draw some tangible comparisons between this fauna 
and that of the Persian Gulf, Gulf of Oman, and Arabian 
Sea, as evidenced by the Townsend collections mentioned 
above; but one must wait until the residue of both these 
large gatherings has been finally worked out. 
Sistrum indigoferum, sp.n. (PI. 1X. fig. 1.) 
S. testa ovato-fusiformi, solida, brunneo-cinerea, corrugata; anfracti- 
bus 5, quorum apicales...? (in omnibus nostris speciminibus 
detriti), ceteris longitudinaliter nodulosi-costatis, costis percrassis, 
* Among the nov. sp. are 5 Cuspidaria, 1 Raéta, 1 Lyonsia, 1 Cardita, 
2 Amussium, 3 Gastrochena, 1 Diplodonta, 1 Chione, 2 Scintilla, 1 Tel- 
lina, some dredged at great depths. 
+ Bull. Soc. Philom. ix. pp. 71-77. 
{ ‘ Naturaliste,’ 1898, pp. 14 et sqq. 
§ evan and Chemnitz, System. Conch.-Cab., Scalariide, S. Clessin, 
pp: 49, 97. 
|| Bavay, A., “Note sur les Mollusques du Canal de Suez,” Bull. Soe. 
Zool. France, xxiil. pp. 161-164. 
| Field Col. Mus. Zool. i. pp. 187-189 (1898). 
** “Symbol Physice, seu Icones adhuc inedite .... qué ex itineribus 
per Libyam, gyptum,.... F. G. Hemprich et C. G. Ehrenberg, annis 
1820-25 redierunt. Zoologica. II. Mollusca.’ 
