24 



patulo, crenis magnis cincto ; ared umbilicali unicostutd ; aperturd 

 subrotundatu, internt hisvlcatd. Alt. 4, diam. 6į lin. 

 Hab. Puerto Galero, island of Mindoro, Philippines ; in seven fa- 

 thom.s, sandy mud. 

 C'ab. Cuming. 



7. SoLARiuM DEALBATDM. Sol. testd conico-trocMformi, albd ; 

 anfractibits planulatis , ąuadriseriatim granulato-costatis ; cingulo 

 ultimo paulo majore, prominulo ; umbilico coarctaio, crenis parvis 

 instructo ; ared umbilicali mullicostatd ; aperturd rotundatd. 

 Alt. 7, diam. 6 lin. 



Hab. Manila. Cab. Hinds. 



This species may be readily distinguished from S. variegatum by 

 its uniform colour and by tlie several ribs \vhich cross the umbilical 

 space, all of whicb are of equal size ; from 5. cylindraceum by its 

 decided conical shape, and the characters detailed above observable 

 in the infericr girdle. 



It is unquestionable that a sound division of the genus may be 

 effected, by taking S. variegatum as the type of a new group ; and 

 this opinion rests on the conformation of the foot of the animal, de- 

 cidedly sessile eyes, and veiy peculiar operculum of this species. 

 But in trying to efFect this I have met with the following genera, all 

 of which have been advanced for sections of the genus as left by 

 Lamarck : — Omalasis, Deshayes; Bifrontia, Deshayes ; Helicites, 

 Schlotheim ; Cirrus, Sowerby ; Euomphalus, Sowerby ; Schizostoma, 

 Bronn ; Solariella, Searles Wood ; Torinia, Gray ; and not having 

 before rae the materials for deciding their respective merits, and being 

 averse to treating the difficulty as a gordian knot by the erection of 

 another genus, I am compelled to leave the subject as I found it. 



8. SoLARiUM FRAGiLE. Sol. testu orbiculuto-discoided ; aiifractibus 

 guadriseriatim tuberculato-cingulatis ; cingulo supremo et ultimo 



fusco jnctis, medianis margaritaceis ; ad peripheriam angulatd, 

 crenultttd ; basi tumido ; umbilico patulo, crenis parvis albis acutis 

 cincto ; ared umbilicali Icevi ; aperturd triangulari. Alt. 1, diam. 

 3hn. 



Hab. North coast of New Guinea ; in seven fathoms, sand. 



Cab. Belcher. 



9. SoLARiuM FULVTJM. Sol. tcstd orbiculūto-discoidcd, soliduld, 

 fulvd ; spird retusd, anfractibus multiseriatim granuloso-cingulaiis, 

 medianis minoribus ; ad peripheriam obtusd, carinis duabus, tertid 

 minore intermedid ; basi rotundatd, seriatim granulatd ; umbilico 

 mediocri, crenis concoloribus cincto ; ared umbilicali leviter uni- 

 costatd ; aperturd subguadratd. Alt. 1^, diam. 3^ lin. 



Hab. New Guinea, Cab. Belcher and Hinds. 



10. SoLAEiuM viRGATUM. Sol. tcstd orbiculūto-discoided, spird 

 retusd ; anfractibus ąuadriseriatim granulatis, cingulo supremo et 

 ultimo rujis, medianis albis ; ad peripheriam obtusis, duabus carinis 

 crenulatis ; basi rotundatd, seriatim granulatd ; umbilico mediocri, 



