ACADEMY OF NATURAL SCIENCES. 157 



latis, suturis fere rectangulatis, supra spiram bi- sen tri-carinatis, carinulis aliis 

 postea intercalaDtibus ; tota superficie elegantissime et creberrime radiatim 

 lirulata, lirulis acutissimis, extautibus, supra cariuas subgranulosis, interstitia 

 anfr. primis Jenestrantibus, postea decussantibus ; basi valde rotuudata ; cari- 

 nulis circ. v., antica granulosa, sculpta ; umbilico maximo, anfractus intus 

 monstrante, liueis spiralibus circ. iii. distantibus, et lirulis radiautibns a basi 

 continuis, conciune ornato ; apertura rotuudata, a cariDulis indentata, vix 

 parieti attingente, intus iridescente, nacreS : operculo tenuissimo, nmltispirali, 

 anfr. circ. x., radiatim eleganter rugulosis. 



Long. 0.38, long. spir. 0.19, lat. 0.42, div. 85°. 



Hah. Catalina Island, 30-120 fms. 20, both alive and dead. 



The name Solariella, given to a crag fossil (tertiary) species by Searles "Wood, 

 which he afterwards reunited to Margarita, is here used as a subgenus, in the 

 author's sense, for Margarita with large crenated umbilicus. This is one 

 of the many instances in which the North Pacific fauna carries out the ideas 

 of the English crag. Unfortunately, the name appears in Add. Geu. I, 431, 

 for a subgenus of Monilea, with which these shells have only a limited affinity ; 

 and, accordingly, the true Solariella have been reconstituted as part of Minolta, 

 A. Ad. That gentleman, however, fully accords with the present arrangement. 

 The Solariellm are known from Trochiscus, and from all forms of Solariada, by 

 the normal (uot inverted) nuclear whirls ; and from the Solarids, by the nacreous 

 texture. 



Dr. Cooper's very lovely species of a very lovely group may possibly prove 

 to be a variety of the Japanese " Minolia aspecta A. Ad." ms. in Mus. Cuming ; 

 but, until more specimens from each district have been compared, it is more 

 prudent to keep them separate. It seems to have exhausted the powers of 

 sculpture on its graceful habitation. Under the microscope, the sharp trans- 

 verse lirulaj, mounting over the keels, dividing the interspaces, and even ascend- 

 ing the wide umbilicus, are eminently beautiful. Even the operculum is sculp- 

 tured with delicate waved radiating lines. It has the aspect of an extremely 

 thin Torinia, with a funnel-shaped umbilicus. This is not only bounded by a 

 granular keel, but has three other distant spiral lines crossing the lirulae. The 

 radiating sculpture is more distant on the upper whirls, where first two, then 

 three keels appear, fenestrated by the lirula?, which afterwards become much 

 closer, and are sometimes worn away behind the labrum. 



Margarita Leach, 1819. 

 Margarita acuticostata Carp. n. sp. State Collection, Species 354. 

 M. t. M. lirulata simili ; parva, tenui, albido-cinerea, olivaceo-fusco varie 

 maculata, seu punctulata ; anfr. nucleosis ii. Ia3vibus, tumidis, fuscis, apice 

 mamillato ; anfr. norm. iii. tumidis, tabulatis, suturis rectangulatis ; carinis 

 acutis in spira iii., quarta peripheriali, a?quidistantibus ; interstitiis spiraliter 

 striatis ; in spira et circa basim radiatim creberrime striulatis ; basi subro- 

 tundata, lirulis distantibus circ. ix. ornata ; umbilico magno, infundibuliformi, 

 vix angulato, intus interdum striis spiralibus paucis sculpto ; apertura subro- 

 tundata, pariete parum attingente : operculo anfr. paucioribus, circ. vi. suturis 

 subelevatis. 



