S T M A T I A. 



Genus STOMATIA, Ildbling. 



Testa haliotoidea, vcl subtrochiformis, medio anfractus 



nllimi spiraliter hicarinata ; carinis tuhcrculatis. 



Spira producta, anfractibiis ad S7itura7n rugato- 



pUcatis. Opercidum nullum. 

 Sliell haliotis-shaped, or trochiform, spirally keeled in 



the middle of the last whorl ; keels tubcrculated. 



Spire produced, whorls wrinkled in plaits at the 



suture. Oi)ereulum none. 



The distinction between this genus and Stomatella is, 

 that the shells of Stomalia have two more or less 

 distinct tuberculated keels in the middle of the whorls 

 and arc crenulated at the suture. The habitats are as in 

 Stomatella, the majority being Philippine. The type, 

 Stomatia phymotis, is a Red Sea shell, and its nearest 

 ally, 5. Aiistralis, affects the locality which its name 

 implies, besides being found in the Philippines. 



The gcmis 3Iicroth, consisting of but a single species, 

 is hardly worth separating, the dictinction being the 

 singular one of the inner margin of the aperture being 

 continued spirally and visible to the apex. 



Species 1. (Fig. a, b, c, Mus. Brit., Nobis., &c.) 



Stomatia Australis. Sto. testa obliqiu't, anjustd, 

 avreo-svbvmdi, vel pallide purpureo-rubescenti, 

 vel variegata, costellis acute nodtili/eris liratd ; i 

 spird parvd, elevatd, anfractibus duobus, j/an'is, i 

 bica7-inatis; ultimo aiifractu magno, ad sutii7-a?n j 

 valiile plicato, i/ifrd plicas excavato, turn 7node7-ate 

 gibboso, delude dcclivi, medio bicarinato, carinis j 

 subtlistant/hus, subcequalibiis, acute nodulusis : infra ] 

 cari/ias rttgobii. 



The Australian Stomatia. Shell oblique, narrow, 

 greenish gold, or pale purplish-red, or variegated, ■ 

 ridged with little noduliferous ribs; spire small, 

 elevated, whorls two, small, two-keeled : last ! 

 whorl large, strongly plaited at the suture, ex- [ 



cavated below the plaits, then moderately gibbous, 

 thence sloped, bicarinate in the middle, keels 

 rather distant, nearly equal, sharply nodulous ; 

 wrinkled below the keel. 



A. ADAM.S. Proc. Zool. Soc, 1850. 



Ilab. Australia. Philippines. 



Differing from Stomatia phimotis in the narrower 

 form, sharp tubercles, and equal central keels. In this 

 species we include all the shells figured as varieties of 

 St. pliy7/iotis in the Thesaurus. But fig. 51 (Thes.) 

 represents a very abnormal form. 



Species 2. (Fig. a, b, Mus. Brit, and Nobis.) 



Stomatia phymotis. Sto. testa valde obiiqud, crassd, 

 rugosd, rubro variegatA; ad suturam plicato- 

 rujatd, twn tumidd, tubercjdatd, 7nedio cariniis 

 duobus obtusis, tuberculatis ornato ; infrd tubercu- 

 lati7n costatd ; aperturd oblique subquadratd ; apice 

 elevato, exserto, acuta. 



The tubercled Stomatia. Shell very oblique, thick, 

 rugose, variegated with red, plaited in wrinkles at 

 the suture, then tumid, tuberculated, ornamented 

 in the middle with two obtuse, tuberculated keels, 

 with tuberculated ribs below ; aperture obli(iuely 

 subquadrate ; apex elevated, exserted, sharp. 



Hf.lbling. 



Ilaliotis imperforata, Chenmitz. 



Ilab. lied Sea. Gulf of Suez. 



Species 3. (Fig. a, b, Mus. Nobis. ) 



Stomatia obsccea. Sto. testa oblique subquadratd, 

 pallidissimi rubro variegata, tubercidis rotundatis 

 plicisque rugatd ; spird pa/Ta, exsertd ; ultimo 

 anjmctu ad suturam plicato excavato inter plicas 

 jiro/unde faveolato, tiim caiind iuberculatd elevatd 

 et ad //tedium caiind duplicatd pi-o//iine/iti cincto ; 



April, 1874. 



